Adopted from Derbyshire Constabulary ([75], online).
\r\n\t
",isbn:"978-1-83969-642-8",printIsbn:"978-1-83969-641-1",pdfIsbn:"978-1-83969-643-5",doi:null,price:0,priceEur:0,priceUsd:0,slug:null,numberOfPages:0,isOpenForSubmission:!0,hash:"5d7f2aa74874444bc6986e613ccebd7c",bookSignature:"Prof. Antonio Morata, Dr. Iris Loira and Prof. Carmen González",publishedDate:null,coverURL:"https://cdn.intechopen.com/books/images_new/10901.jpg",keywords:"Grape, Wine, Vine Biotechnology, Plant Disease, Vine Physiology, Wine Technology, Winemaking, Fungal Disease, Biological Control, Vigor Management, Aroma Compound, Polysaccharide",numberOfDownloads:null,numberOfWosCitations:0,numberOfCrossrefCitations:null,numberOfDimensionsCitations:null,numberOfTotalCitations:null,isAvailableForWebshopOrdering:!0,dateEndFirstStepPublish:"March 4th 2021",dateEndSecondStepPublish:"April 1st 2021",dateEndThirdStepPublish:"May 31st 2021",dateEndFourthStepPublish:"August 19th 2021",dateEndFifthStepPublish:"October 18th 2021",remainingDaysToSecondStep:"13 days",secondStepPassed:!0,currentStepOfPublishingProcess:3,editedByType:null,kuFlag:!1,biosketch:"Prof. Morata is the Spanish delegate at the group of experts in wine microbiology and wine technology of the International Organisation of Vine and Wine (OIV). His team won the international Enoforum award 2019 by the application of UHPH in wines and was among the 5 finalists in 2020 by using PL.",coeditorOneBiosketch:null,coeditorTwoBiosketch:null,coeditorThreeBiosketch:null,coeditorFourBiosketch:null,coeditorFiveBiosketch:null,editors:[{id:"180952",title:"Prof.",name:"Antonio",middleName:null,surname:"Morata",slug:"antonio-morata",fullName:"Antonio Morata",profilePictureURL:"https://mts.intechopen.com/storage/users/180952/images/system/180952.jpg",biography:"Antonio Morata is a professor of Food Science and Technology at the Universidad Politécnica de Madrid (UPM), Spain, specializing in wine technology. He is the coordinator of the Master in Food Engineering Program at UPM, and a professor of enology and wine technology in the European Master of Viticulture and Enology, Euromaster Vinifera-Erasmus+. He is the Spanish delegate at the group of experts in wine microbiology and wine technology of the International Organisation of Vine and Wine (OIV). He is the author of more than 70 research articles, 3 books, 4 edited books, 6 special issues and 16 book chapters.",institutionString:"Technical University of Madrid",position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"6",totalChapterViews:"0",totalEditedBooks:"3",institution:{name:"Technical University of Madrid",institutionURL:null,country:{name:"Spain"}}}],coeditorOne:{id:"186423",title:"Dr.",name:"Iris",middleName:null,surname:"Loira",slug:"iris-loira",fullName:"Iris Loira",profilePictureURL:"https://mts.intechopen.com/storage/users/186423/images/system/186423.jpg",biography:"Iris Loira is an assistant professor of Food Science and Technology at the Universidad Politécnica de Madrid (UPM), Spain. She is the author of 46 research articles, 3 books and 11 book chapters.",institutionString:"Technical University of Madrid",position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"4",totalChapterViews:"0",totalEditedBooks:"0",institution:{name:"Technical University of Madrid",institutionURL:null,country:{name:"Spain"}}},coeditorTwo:{id:"201384",title:"Prof.",name:"Carmen",middleName:null,surname:"González",slug:"carmen-gonzalez",fullName:"Carmen González",profilePictureURL:"https://mts.intechopen.com/storage/users/201384/images/system/201384.jpg",biography:"Dr González-Chamorro has worked as a professor at the UPM since 1993. She has dedicated her teaching work to food technology and applications in the fruit and vegetable industries and fermented meat products. From 2004 until 2016 she held management positions in the university (Ombudsman and Deputy Director of University extension and International Relations). Her research activity has focused on the field of oenological biotechnology and on the selection of microorganisms (yeasts and BAL) that are of special interest in wine making processes. She has extensive experience in the use of instrumental and sensory tests to assess the quality of alcoholic beverages (wine and beer) and meat products. She has participated in different educational innovation projects and coordinated three of them. These projects have made it possible to coordinate working groups for the implementation of degrees in the EEES, and apply new teaching methodologies that allow the acquisition of horizontal competences by students. 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Venkateswarlu",coverURL:"https://cdn.intechopen.com/books/images_new/371.jpg",editedByType:"Edited by",editors:[{id:"58592",title:"Dr.",name:"Arun",surname:"Shanker",slug:"arun-shanker",fullName:"Arun Shanker"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"72",title:"Ionic Liquids",subtitle:"Theory, Properties, New Approaches",isOpenForSubmission:!1,hash:"d94ffa3cfa10505e3b1d676d46fcd3f5",slug:"ionic-liquids-theory-properties-new-approaches",bookSignature:"Alexander Kokorin",coverURL:"https://cdn.intechopen.com/books/images_new/72.jpg",editedByType:"Edited by",editors:[{id:"19816",title:"Prof.",name:"Alexander",surname:"Kokorin",slug:"alexander-kokorin",fullName:"Alexander Kokorin"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"314",title:"Regenerative Medicine and Tissue Engineering",subtitle:"Cells and Biomaterials",isOpenForSubmission:!1,hash:"bb67e80e480c86bb8315458012d65686",slug:"regenerative-medicine-and-tissue-engineering-cells-and-biomaterials",bookSignature:"Daniel Eberli",coverURL:"https://cdn.intechopen.com/books/images_new/314.jpg",editedByType:"Edited by",editors:[{id:"6495",title:"Dr.",name:"Daniel",surname:"Eberli",slug:"daniel-eberli",fullName:"Daniel Eberli"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}]},chapter:{item:{type:"chapter",id:"68586",title:"Optically Multiplexed Systems: Wavelength Division Multiplexing",doi:"10.5772/intechopen.88086",slug:"optically-multiplexed-systems-wavelength-division-multiplexing",body:'\nSince its advent in the mid-1960s, optical technologies and components have been changing the landscape of communication as such. The constant push for higher data rates ensured that optical components matured fast, enabling the terabits of data rates we are enjoying today. It all started with extremely lossy optical fibers coupled with a broadband source, which could transmit only a few mbps over a few meters. The scenario drastically changed over half a century, reaching data rates of even terabit/sec possible over a single fiber. Now we have the luxury of external cavity lasers (ECL) which can easily give linewidths below 1 MHz, Mach-Zehnder modulators (MZM) which can easily operate at 40 Gbps and above, low attenuation dispersion managed fibers, dispersion compensation fibers, low-noise high-gain optical amplification systems, very high-speed detectors, and extremely fast digital signal processing (DSP) capabilities which make many compensation hardware redundant.
\nA commonly overlooked component of this lot is the multiplexer, without which the entire system is only fast enough as any of its electronic counterpart. Multiplexer is the one which helps in combining (and splitting) the data from different sources so that the tremendous bandwidth of the system could be utilized. As with other components, Mux/DeMux came a long way into maturing and providing the kind of precise work it does today. So, this chapter is dedicated for giving the readers a quick understanding of the different types and techniques for the implementation of wavelength division multiplexing (WDM) schemes.
\nMultiplexing is the process of combining multiple signals into a shared channel used for tapping the full potential of the optical links. It facilitates networking with advanced topologies supported with redundancy features. Historically, multiplexing had been used to share the limited bandwidth of the medium between different transmitters, but with optical systems it is more about making full use of the huge available bandwidth. This is where wavelength division multiplexing comes in where different channels are multiplexed into a single fiber. It divides the huge bandwidth of optical fiber into various logical channels of lower bandwidth that can be filled with electronically achievable data rates. The advent of coherent optical links and advanced multiplexing techniques used in wireless communication raised the achievable bandwidth limit of fiber links. But the proposed chapter focuses on one of the most common and important multiplexing techniques, wavelength division multiplexing.
\nThe advent of erbium-doped fiber amplifiers (EDFAs) in the late 1980s proved to be a great impetus for multichannel system implementation. EDFA, with its capability to amplify the C-band, proved to be a vital component that could facilitate WDM in long-haul links. As the different WDM channels could traverse the fiber without cross talk, and EDFA can amplify these signals simultaneously, it increased the transmission rates exponentially. This ushered in the need of multiplexers, specifically wavelength division multiplexers. A few popular optical multiplexing techniques are discussed later in this chapter. Also, it should be noted that being bi-directional, most of these devices in these schemes can be used as Mux or DeMux.
\nWith the optical components maturing and becoming very reliable and accurate, almost all multiplexing techniques possible in the wireless communications are viable in optics now. Though a few are truly developed, the others are expected to mature in the near future. A few of these techniques are discussed here.
\nProbably the most used scheme in electrical and wireless systems, optical time-division multiplexing (OTDM) does not have that much widespread use, probably because of the large bandwidth already available with optical fibers and the widespread use of WDM but is still used in different applications. Pulse interleaving is used to allow different optical data streams to use the full capacity of the fiber, albeit for a limited time. Different optical data pulses thus share the same optical channel with its full capacity for a limited time and passes on to the next pulse and so on so forth. Thus, the overall data rate in the fiber is improved despite the fact that the individual data streams are still operating at the same speed. But the optical pulses have to be compressed, to fit in the time slot per bit. A train of ultrashort pulses can be helpful in this regard, along with an optical delay line for combining all the pulses. So, for a good OTDM link, we need pulses with high extinction, short duration, and low timing jitter.
\nThe basic idea is to have different channels separated spatially. This spatial separation can be brought out in different ways; the simplest is with the use of multiple fibers. But this requires most of the channel infrastructure to be duplicated for each fiber, hence not most economical. But still there could be some cost improvements as one may choose to use a high-power laser along with splitters to pump different optical amplifiers corresponding to each fiber. Or multiple fibers can be integrated to form one fiber cable or use a fiber ribbon. Another possible way of cost reduction is by using a vertical-cavity surface-emitting laser (VCSEL) array at the source along with the integration of different receivers into the same chip. Also, some electronics can also be shared between different channels too.
\nA better implementation of SDM will be using multicore fibers. These are single optical fibers having multiple cores, each core carrying one communication channel. The cores are usually separated enough that there is no coupling and cross talk. But this limits the number of cores, as increasing the cladding diameter tends to make the fiber more brittle. Additionally, this makes fiber splicing more difficult.
\nA work around of this is to keep the core together allowing the different modes to couple to form a supermode (coupled SDM fiber) and then later electronically process the detected data using multiple input/multiple output (MIMO) techniques in detection process. MIMO techniques have already matured in wireless communication. Photonic crystal fibers are a very good candidate for these kinds of coupled SDM fibers. But there are a lot of challenges that are to be dealt with before this becomes commercial; this includes difficulties in splicing multicore fibers, maintaining the correct rotation orientation, developing spatial multiplexers and fiber amplifiers, providing sufficient gain uniformity over different modes, etc.
\nAnother potential method for the MIMO setup is the use of few-mode fibers, using a technique called mode division multiplexing (MDM). This has some advantages like easier fiber connections and splices. But as the cross talk with different fiber modes are high and there is a significant difference in the group velocity of the different modes, MIMO receivers are much more complex than the above techniques [1].
\nGenerally used together with phase modulation or QAM, the idea is to modulate different information on orthogonal polarizations of the same frequency effectively doubling the data rate. PDM signal can be transmitted over normal WDM infrastructure expanding its capacity. But here the challenges are the drifts in the polarization state of the fiber-optic system over time. Also polarization mode dispersion, polarization-dependent losses, and cross-polarization modulation create additional challenges. But the DSP techniques at the receiver are becoming faster and more efficient in compensating these impediments.
\nThe orbital angular momentum (OAM) of the light waves is used to carry orthogonal information. OAM can in theory have huge number of parallel channels, bound only by practical limitations. OAM states of light is not supported on conventional single-mode fiber, instead few-mode or multimode fibers are to be used. Additionally, conventional fiber suffers from mode coupling which changes the orbital angular momentum when the fiber is bent or stressed causing mode instability. But coherent detection along with signal processing techniques can be used to correct mode mixing in fiber. These coherent systems are normally complex in nature.
\nA WDM link typically used in communication system is as shown in the block schematic (Figure 1). There are multiple transmitters each working on its own dedicated wavelength. These individual data streams on independent wavelengths are all multiplexed together using a WDM Mux and transmitted through an optical fiber. The transmitted power is kept low enough in the link, so as not to trigger any nonlinearities in the fiber. In the absence of nonlinearities, the wavelengths do not talk to each other or induce cross talks. The C-band can be divided coarsely every 20 nm (called coarse WDM) if the link is low cost or have to support only limited number of parallel light paths. Dense WDM uses a much more tighter wavelength division scheme and needs costlier components and better lasers with lower linewidths and external modulators. It supports a greater number of channels resulting in a much higher throughput, e.g., 40 channels within 1530–1565 nm, C-band with 100 nm spacing, or 80 channels at 50 GHz spacing or even 12.5 GHz—all at the cost of significant overhead costs.
\nBlock schematic of a basic WDM link.
These multiplexed data will become weaker over the distance, and that’s where the EDFA comes in. It’s EDFA’s broad bandwidth, which helps in amplifying all the channels with nearly the same gain, that paved the path for the bandwidth explosion within the fiber. After the amplification the wavelengths are demultiplexed at the DeMux and forwarded to the corresponding receivers which completes the link.
\nTypical WDM link consists of components like transmitters, add/drop multiplexers, and necessary detectors for the communication link. Based on the requirements, it also includes preamplifier, line amplifiers, and post amplifiers in the link. Specific WDM components like WDM/demultiplexer (Mux/DeMux) matured fast to make the systems relatively common and affordable. It also made possible to have fiber links to their maximum possible bandwidth capability.
\nLaser is the most widely used optical source, owing to its inherent advantages like single-frequency operation, coherence, high intensity, and directionality [2]. Laser is essentially an oscillator, having a gain medium and feedback mechanism. The gain medium is kept at an excited state by external pumping mechanisms (optical or electrical). This produces population inversion which is a necessary condition for lasing. Initial photons can be introduced into the medium by spontaneous emission, and those modes that are supported by cavity and gain spectrum are lasered out. The basic assembly of a laser is as shown in Figure 2.
\nLaser assembly block schematic.
The development of semiconductor lasers operating at room temperature (1970) provided a compact, highly efficient, and reliable optical source, which is put to great use by the communication industry [3]. Semiconductor laser needs an optical feedback mechanism for converting it from an amplifier to oscillator. Oscillations begin when the loop gain exceeds unity. Gain is obtained due to stimulated emission in optical gain medium, and the cavity formed by cleaved laser facets provides the required feedback for sustained oscillations. This configuration forms a Fabry-Perot (FP) cavity. FP laser can lase at multiple longitudinal modes that are spaced apart according to \n
DFB laser developed during the 1980s is the most commonly used single-mode laser. The idea is to introduce a wavelength selective element within the laser cavity. This is achieved by introducing an etched diffraction grating within the laser waveguide structure. This can be done in two ways. If the grating layer extends through the whole of the active layer, it is called DFB, and if the gain region is in a separate planar section, the device is known as distributed Bragg reflector (DBR). Figure 3 shows the structure of a DFB laser.
\nDFB laser structure [
In DBR lasers, the fiber Bragg gratings are used like mirrors in FP cavity with the difference that these gratings reflect only one longitudinal mode. The active layer provides cumulative gain only for the feedback wavelength, hence resulting in single-wavelength operation of laser. A Bragg grating is realized by periodically varying refractive index along the length of the optical transmission. Condition for reflection of Bragg wavelength \n
where m is an integer and n is the refractive index. Due to frequency selective nature of the feedback mechanism, the output of the laser becomes highly monochromatic. Later improvements in DFB lasers include phase-shifted DFB laser [4] and gain-coupled DFB lasers [5].
\nIn a semiconductor laser under forward bias, population inversion occurs, and optical gain is realized only when the injected current into the active region is greater than a minimum value known as the transparency value [3]. The input signal propagating inside the gain medium is amplified by a factor of \n
The process of imposing data on the light stream is called modulation. At bit rates more than 10 Gb/sec, chirp effect induced by direct modulators is predominant and puts a limit on modulation bandwidth. Chirp is a phenomenon wherein the carrier frequency of transmitted pulse varies with time, causing broadening of the transmitted spectrum. Laser output acts as a carrier signal over which the input signal gets modulated with the help of modulators. These modulators are classified into electro-absorption (EA) and electro-optic modulators. The performance of an external modulator is measured based on extinction ratio and the modulation bandwidth.
\nIn direct modulation the laser output intensity is controlled by directly modulating the injection current of laser diode in accordance with the input signal. But this can lead to chirping effect at higher frequencies. So, it is preferred to keep the laser source as itself and modulate the light output from it by keeping an external modulator in front. Figure 4 shows the schematics of direct and external modulation schemes.
\nModulation schemes (a) direct modulation and (b) external modulator.
Direct modulation of laser drive current is simpler, cost effective, and gives satisfactory performance for lower-frequency-modulating signals. But as the drive current to laser is varied directly, turn on delay and oscillation can result out of the fast-changing pumping current causing frequency chirping and linewidth broadening [6]. ON and OFF operations of laser cause the gain to change rapidly in the lasing medium. The change in gain causes a change in carrier concentration which in turn changes the refractive index, and this periodic change in the refractive index results in frequency chirping (the spectrum changes with time). When a chirped pulse propagates through a dispersive medium like optical fiber, the spread in frequency causes certain portion of the wave to travel faster/slower with respect to other portions leading to intersymbol interference (ISI).
\nA direct modulation is not suited for very high data rate transmission due to reasons such as chirp in DFB laser and mode partition noise in FP laser. So external modulation schemes are used for high-frequency modulation as it does not affect the laser characteristics and is implemented as an additional component in front of a CW laser. But this leads to an additional insertion loss for external modulators. Large modulation bandwidth and depth, small insertion loss, lower electrical drive power, etc. far outweigh its cons for bit rates above some 10 Gb/s. Some desirable characteristics of external modulators are polarization independence, good linearity (between drive current and modulated output), lower cost, and smaller size.
\nExternal modulators make use of techniques like electro-optic effect, acousto-optic effect (AOF), and electro-absorption effect to modulate the information signal over the incident CW optical beam. Acousto-optic modulators are slower and hence are commonly not used for communication purposes.
Another class of external modulators are the
The inherent immense bandwidth of optical fiber systems can be tapped by the use of multiplexing techniques, which facilitates the electronics to work in much lower rate than the optical transmission rate. It is known that transmitting data over a single fiber with higher rates is more economical than carrying lower data rates over several fibers [9]. This makes multiplexing a must, so that huge transmission capacity of the optical fibers can be supported using moderate electronic component rates.
\nDifferent varieties of Mux/DeMux are available. Mostly these are reciprocal devices, hence can be used as both Mux and DeMux. They can be classified under two broad categories, diffraction-based and interference-based. Diffraction-based devices rely on angular dispersive element like diffraction gratings to decompose the incident light into its spectral components.
\nInterference-based DeMux are based on optical filter and directional couplers. Filter-based Mux uses optical interference for wavelength selectivity. MZI-based filters are the most used. One arm of MZI can be made longer to induce phase difference with respect to the other arm. This phase difference is frequency dependent. The path length is adjusted such that power from two different input ports adds up at only one output port (Mux operation).
\nThe idea is to spatially separate the different wavelength that were traversing together in the optical fiber. Each of these wavelengths can be collected in those points into individual optical fibers. Optical Mux/DeMux can be broadly classified into passive and active. Popular passive Mux/demultiplexers are based on Prims, diffraction gratings, and spectral filters. Active Mux/DeMux is usually implemented as some passive components along with tunable detector, each tuned to separate wavelength. We will see each of them in a bit more details now.
\nThese devices work based on the principle of dispersion, where different wavelengths see a different refractive index in the medium. This difference in refractive index results in some wavelengths to bend more (or less) than others which helps in separating them out. As can be seen in Figure 5, the incoming wavelengths are collimated and incident on the prism. Each wavelength seems a slightly different refractive index and bends differently according to Snell’s law. At the output another lens focuses the different wavelengths to different output fibers.
\nPrism-based DeMuX configuration [
Superprisms employ photonic bandgap that make certain wavelength forbidden within the structure. This is achieved using special structures called photonic crystal. A photonic crystal is a periodic dielectric structure fabricated usually on Si using nanofabrication. This three-dimensional periodicity in refractive index causes periodic distribution in bands and gaps, and these can be tuned by varying the periodicity so as to make certain wavelength to propagate or not. It can act both as energy bandgap filters as described above and as highly dispersive media. This high-dispersion property can be used to make prism called superprisms as they have almost 500 times more dispersion than normal prisms.
\nDiffraction elements as the name suggests use diffraction of light to separate different wavelengths. When a polychromatic light wave is incident on a diffraction grating, each wavelength is diffracted at a different angle from where they can be collected to achieve demuxing (Figure 6).
\nDiffraction grating-based Mux configuration [
AWG works on the principle of interference on a specially designed structure as shown in Figure 7. It has two free space propagation regions (S1 and S2), an array of waveguides (Wn) in the middle and fibers for input and output. A WDM signal incident on S1 through F traverses the free space and enters the arrayed waveguide region. The length of each waveguide in the arrayed waveguide section is varied such that it introduces a wavelength-dependent phase delay in S2. This phase delay causes the interference points of each wavelength to be spatially separated, where a fiber is connected to collect each wavelength, hence attaining DeMux.
\nAWG-based Mux/DeMux configuration [
AWG has some interesting features as follows which makes it very attractive.
AWG has a flat spectral response.
It has low losses and cross talk (insertion loss <−3 dB and cross talk <−35 dB).
It can be fabricated on Si as photonic-integrated circuit (PIC) and can be easily integrated with photodetectors as well.
AWG suffers from drawbacks like polarization dependency and temperature sensitivity. A lot of works have been done in addressing these issues.
\nMZI-based Mux/DeMux works in the same principle of interference, where interfering coherent light of different wavelengths forms maxima at different spatial points and hence can be demuxed out. MZI-based Mux/DeMux devices can be integrated on silica.
\nA spectral filter inserted in the optical path can be used to sort out wavelengths and hence can be used as DeMux. These devices can be implemented in different configurations, a couple of which are shown in Figure 8.
\nSpectral filter-based devices [
The first one is a fiber sandwiched at the cleaved surface of a fiber. The incident ray with two wavelengths is incident on the filter, which passes one and reflects the other. The reflected one is collected through another fiber achieving DeMux operation. Another form of filter can be implemented in a graded-index (GRIN) rod.
\nAn interesting method for realizing a DeMux is shown in Figure 9. The device consists of an all-pass polarizer which linearly polarized the input signal. For demultiplexing these linearly polarized wavelengths, a combination of AOF and polarizing beam splitter (PBS) is used. The AOF can be controlled with electrical signal to rotate the polarization of a desired wavelength from transverse electric (TE) to transverse magnetic (TM). The PBS then reflects one of the wavelengths based on its polarization, resulting in DeMux operation.
\nAcousto-optic filter configuration [
Optical signals produced by laser, modulated with information at the multiplexer and segregated and propagated through optical fiber, are prone to attenuation and losses arising from all these components. Optical fiber technology is so advanced now that the transmission loss is practically negligible for short-haul communications. It is the component insertion loss that causes more serious signal attenuation. Eventually signal amplitude may get small enough to fall below the receiver sensitivity, which can be prevented with the use of amplifiers in the optical link. Before the invention of optical amplifiers, amplification could only be done in electrical domain. But this needed conversion from optical to electrical and then back to optical conversion (O-E-O). Additionally, electrical regenerators are generally sensitive to bit rate and modulation formats, which make it less flexible for additional capacity. But optical amplifiers work in optical domain and amplify the signals without O-E-O conversion. Further, they are transparent to bit rate and modulation format changes. Now, there are amplifiers that have a wide gain-bandwidth like EDFA, Raman amplifiers that can amplify signals over a large wavelength range. These facilitate the widespread use of WDM systems, which need simultaneous amplification of a wide range of wavelengths.
\nEDFAs are the most commonly used optical amplifiers owing to their larger spectrum and high gain and simplicity. EDFA came into being by the early 1990s and has completely changed the landscape of optical communication industry. The most significant advantages of EDFA is its ability to amplify a wider bandwidth of signals, which is a big boost to WDM technique, as multiple channels can be amplified simultaneously. Other important aspects that make EDFA so mainstream is the availability of compact and high-power pump laser source, polarization insensitivity, easiness in coupling, absence of cross talk, and its inherent simplicity [3].
\nEDFA is an optical fiber with its core doped with rare earth mineral, which acts as the amplifying medium. Doping can also be done using holmium, neodymium, samarium, thulium, and ytterbium to provide gain in ranges from 500 to 3500 nm. EDFA has the capability to amplify signals in 1550-nm band, the standard telecommunication regime [11].
\nOne main problem with EDFA is its nonuniform spectra. Different channels are amplified differently, and the difference builds up over a long-haul system with multiple EDFAs. Energy levels and gain spectrum of EDFA are shown in Figure 10. Several solutions have emerged in addressing this issue efficiently.
\n(a) EDFA energy level diagram (b) absorption and gain spectra (codoped with Germania) [
Optical detectors are devices that convert the optical signals into electrical signals. Usually a photodetector is followed by a front-end amplifier to amplify the electrical signal, which is followed by a decision circuit that estimates the data content of the electrical signal. Decision circuit needs to know the modulation scheme used for transmission. An optional optical preamplifier section can be used in front of the photodetector.
\nPhotodetector works based on photoelectric effect. It is desirable for a photodetector to have “high sensitivity, fast response, low noise, low cost, and high reliability” for being more effective in communication engineering. When a photon of energy, hν, which exceeds the photodetector band gap, is incident on a photodetector, the photon is absorbed, and an electron-hole pair is generated (Figure 11). The electric field across the junction sweeps off this excess charge, hence producing a current flow in the external circuit.
\nPhotodiode basic principle.
Normally a reverse bias is applied to the junction. A reverse bias adds to the junction electric field, and the photocurrent generated by the absorption of photon is proportional to the incident optical power. It should be noted that the optical power is exponentially attenuated while it passes through the semiconductor material. The energy of the incident photon should be larger than the bandgap, e.g., of the detector. The lowest such wavelength is the cutoff wavelength above which the detector cannot operate. As Si and Ge have cutoff wavelength lower than 1550 nm, they are not used for communication application. Generally, indium gallium arsenide (InGaAs) and indium gallium arsenide phosphide (InGaAsP) are used in 1550 and 1310 nm wavelength ranges.
\nAn important characteristic of photodetector is its responsivity, R. It is defined as
\nwhere \n
which can be written in terms of \n
As light is incident on the end of PN junction, the electron-hole pairs generated have to diffuse to the depletion region before getting swept away (drift) to the corresponding electrode, hence creating current in the external circuit. Diffusion velocity is slow and is in the range of 1 ns per μm. This causes the input signal to be distorted at the electrical output. Increasing the depletion region length can decrease the diffusion time. This is the idea behind PIN photodiode [3].
\nIn PIN photodiode, the depletion region width is increased by the introduction of layer of very lightly doped intrinsic semiconductor material between p and n sides, hence the name PIN. Figure 12 shows the structure of PN junction.
\nPIN photodiode structure.
Due to the light doping, this layer provides high resistance and most of the voltage drops across it. In effect, most of the recombination happen in the depletion region; hence, the drift current far overweighs the diffusion current. So a longer W will increase the photodiode sensitivity, but a longer depletion width also implies larger transit time for the charge carries, hence increasing the response time. So there needs to be a trade-off between sensitivity and response time.
\nSimilar to PN photodetectors, double-heterostructure design can further improve the performance of PIN photodiodes. By choosing material of sufficiently larger bandgap as p and n regions, the absorption can be limited only to the i regions. One such example is to use InP as the p and n region while using InGaP as the intrinsic layer [12]. Such a design helps to avoid the diffusion part of photocurrent, hence increasing the efficiency to nearly 100%. Reflections from the front facets can be reduced by coating with suitable dielectric layers.
\nResponsivity of PN diode is limited by Eq. (3). This is due to the fact that one incident photon can generate maximum of only one e-h pair. Avalanche photodiodes have internal mechanism which overcomes this and can provide larger photocurrent. They are especially preferred when the incident intensity on the photodetector is expected to be low.
\nAs with any maturing technology, WDM too had a lot of challenges to be tackled as it progresses. For example, [13] discusses a hybrid multiplexer which can be used for WDM and MDM. Also WDM have found applications beyond communication, which also brings about additional challenges. Like in [14], WDM is used for optical beam steering, which is archived using photonic crystal waveguide and an integrated version of WDM in coupled micro-ring Muxs. Another field where WDM has found application is inter-chip links, as in [15] where micro-ring wavelength demultiplexers are used.
\nThis section discusses about some of the realization challenges like EDFA transients and unequal link output power, which are not desirable in WDM-based systems. In this section, these effects are analyzed under different test cases and validated experimentally. Transient analysis is based on variations with input power, pump power, duty cycle, cascading stages, and multiplexed configurations.
\nAs seen before, EDFA is a major component in a WDM link for providing amplification in wavelength range around 1550-nm optical communication band. The non-flat gain spectrum of EDFA leads to uneven amplification levels for various WDM channels. This becomes more serious as more and more amplifiers are added in the link. Another serious problem for WDM networks is the wavelength-dependent gain saturation of EDFAs. Because of this effect, the loss or removal of one or more channels at the input of an EDFA can cause large changes in the output powers of the remaining channels. This effect is more predominant in CWDM systems than DWDM systems with a smaller number of wavelengths because of wider wavelength spacings when a single “C”-band EDFA is used for amplification.
\nTo overcome this problem, an L-band EDFA in combination with a C-band EDFA can be used to flatten the EDFA gain spectrum. By using EDFA with longer fiber length or heavy doping concentration, EDFA gain characteristics can be altered [9]. So an L-band EDFA with a longer fiber length was considered. In the proposed configuration, multiplexed signal is split and passed through C- and L-band EDFAs. Figure 13 shows the variation of gain spectra for L-band EDFA. It is suggested that if wavelengths are beyond 1565 nm, L-band EDFAs are better for practical applications [9]. CWDM configuration where the signals are splitted first and then amplified using two separate EDFAs is shown in Figure 14. These signals are recombined later.
\nL-band EDFA gain spectrum (30 m).
Block schematic diagram with C- and L-band EDFAs for power equalization.
Due to slow gain recovery of EDFA gain, the low bit rate signals passing through EDFA undergo saturation and recovery effects during level transitions. The characteristic saturation and recovery times are, for typical operating conditions, in the range of 100 μs to 1 ms. As a result, EDFAs are intrinsically immune to the effects of cross talks at high data rates [16, 17]. The recovery time is of few hundred microseconds, hence do not affect the high bit rate signal amplification, as the erbium concentration is not significantly altered by the high bit rate signal during its short ON time period. But this is not the case with low bit rate signals, which is ON for enough time for reducing the population inversion, hence reducing the gain. The effect can be seen in Figure 15, when EDFA is input (1550 nm) with square optical pulse of 2 KHz and varying duty cycle, pumped with a 980-nm laser at 70 mW. The transient effects are sensitive to input signal duty cycle, signal power, and pump power of EDFA configuration. The following section focuses on EDFA transients applicable to multiplexed fiber links.
\nEDFA response to duty cycle variation (single input pulse).
EDFA transients disappear with increasing bit rate as shown in Figure 16 (bit rate 10 KHz and 1 MHz). It also decreases with lower signal and pump power (Figure 17).
\nEDFA response to 10 KHz (left) and 1 MHz (right) with different duty cycles.
EDFA transient response to signal (left) and pump variations (right).
Transient effects can produce a negative impact as the pulse shape at the output of the link is heavily distorted, it can lead to misinterpretation of data at the receiver side. Also, in cascaded EDFA applications, the transients can accumulate over length and can cause problems at detector stage. A few compensation techniques are described below.
\nTo accomplish this, another complementary signal is multiplexed into the link at a different wavelength which ensures the EDFA input power remains constant. The block schematic and results are as shown in Figure 18. As the wavelength of compensation signal approaches the original wavelength of the signal pulse, the distortion is reduced, i.e., the closer the compensation wavelength, the better the compensation.
\nCompensation using complementary pulse. Block schematic (left) and results (right).
In the case of 50% duty cycle pulse, two more additional suppression techniques are proposed. One uses electrical delay and the other uses optical delay. Figure 19 shows the block schematic used for transient suppression of 50% duty cycle signal using optical delay line. Figure 19 shows the experimental result of the transient suppressed output. The delay introduced should be equivalent to the ON/OFF time of transmitted signal. In this case, only one laser source is required. Optical delay can be introduced by using fiber spools of longer length. The delay can be applied electrically too; schematic and results are shown in Figure 20.
\nCompensation using delayed pulse. Schematic (left) and experimental result (right).
Compensation using electrical delayed pulse. Schematic (left) and result (right).
EDFA transients affect WDM systems too in a similar manner by distorting the transmitted signal [17]. The description of the same is not included within the scope of this chapter.
\nThe chapter introduces the concept of optical multiplexing with special focus on wavelength division multiplexing. Other multiplexing methods are also briefly described highlighting the operation and potential applications. A WDM link is explained by going into detail of the different components making up the link. The chapter also includes a few challenges which degrade the performance of the link and potential methods to overcome those effects.
\nWith the WDM Mux/DeMux described above, adding or dropping an unplanned channel may require the traffic in the entire link be suspended. But with a reconfigurable optical add-drop multiplexer (ROADM), an operator can remotely reconfigure the multiplexing so that data in the other channels are not interrupted. Several technologies are developed for achieving this.
\nAnother interesting development is the emerging of super-channels, which reduces the channel gap close to the Nyquist bandwidth. The idea is to combine multiple coherent carriers to create a unified channel, called a super-channel, which will operate at the maximum data rate supported by the analog-to-digital convertor (ADC) at the receiver. The absence of guard channels and coherent detection ensures high spectral efficiency. Some techniques include orthogonal frequency division multiplexing (OFDM), orthogonal band multiplexed (OBM), no-guard-interval (NGI)-OFDM, multichannel equalization (MCE)-WDM, Nyquist WDM, etc.
\nThese WDM links are widely used in various regimes of communication. At present, majority of the links are made with discrete components. When a greater number of channels are required to be transmitted, a small form factor solution is preferable. Currently many researches are being carried out to bring these components to a photonic-integrated circuit form which can reduce the size to a greater extent. It is quite sure that with the latest advancements in nanotechnology, more components can be integrated resulting in a very-small-factor WDM chips.
\nIn recent years, professionalisation has become a critical discourse [1, 2, 3, 4] for the development of police forces in the United Kingdom. As a result, moving away from traditional training programmes towards more formal higher education programmes has been seen as a way of progress to develop professionalism within the police force [5]. In light of recent development in the field of policing, modernisation became the key concern for workforce development to fulfil the demands of the twenty-first century. The changing nature of policing and the complexity of police work became an integral part of police studies discourse [6, 7]. Recent studies show that having a higher education degree tends to have a more significant impact on police officers’ knowledge and appreciation of the values and lifestyles of peoples from different cultures, especially minority groups and immigrants [8, 9]. Therefore, the professional academic education programme has been suggested as a vital tool for the development of police forces in the United Kingdom [10].
In February 2016, the College of Policing, the national professional body for policing in England and Wales, introduced the Policing Education Qualifications Framework (PEQF) for developing academic programmes for the 43 police forces in England and Wales. The PEQF proposed different routes for providing education, namely Police Constable Degree Apprenticeship (PCDA), Degree Holder Entry Programme (DHEP), and Pre-Join Degree (PJD), in professional policing practice [11, 12]. Student officers are recruited by the forces for the PCDA and DHEP routes on a salaried full-time 40 hours per week contract. Within their contract hours, they have to engage 20% of their time for off-the-job learning with a partner university, being students of an enrolled programme [12, 13].
Several police forces have already launched the PCDA programmes in partnership with several universities. On 7 September 2018, Nottinghamshire Police nationally pioneered the PCDA programme with their first cohort in partnership with the University of Derby. This initiative was followed by Derbyshire Police who then ran their first cohort of the PCDA programme with the same university. Then throughout the year in 2019, some other forces such as Leicestershire, Northamptonshire, South Wales, Gwent, Dyfed-Powys, West Midlands, Northumbria, Avon and Somerset, Staffordshire, Merseyside, and Sussex started running the PCDA programme [14]. These programmes, in fact, shifted the nature of police education and training with a particular focus on theoretical knowledge linking with the professional practice of police work with less or no emphasis on physical education. The primary mission for drastically changing police education and training is to make policing a graduate level occupation [14]. It is not only to replace the Initial Police Learning and Development Programme (IPLDP) or give all officers a university degree, but also to make the officers academically and professionally sound for the complex challenges they face in contemporary policing.
It is not an easy task to transform the century-old traditional police training to the university education programmes over a period of 2–3 years. Due to this transition in developing professional qualifications, both the forces and the higher education institutions (HEIs) are facing challenges in tackling different practical and pedagogical issues in implementing new programmes. On the one hand, the police forces are traditionally conservative [15, 16, 17] as Reiner ([18], p. 130) claims that the majority of police officers are conservative ‘both politically and morally’ and the students of these programmes are the trainee officers of a disciplined force [19, 20]. On the other hand, universities are very much student-focused to ensure the best learning experience for every individual student and encourage them to be critical about their learning journey and broaden their horizons. To run an academic programme successfully, HEIs are required to comply with the frameworks of the Institute for Apprenticeships and Technical Education and other funding requirements, for example from the Education and Skills Funding Agency (ESFA) as well as strictly maintaining academic regulations including Quality Assurance (QA) process and satisfy the Office for Students (OfS). Therefore, HEIs have to be in continuous conversations with the partner forces to solve the problems associated with teaching, delivery, and assessment as they arise.
Despite the fact that the Peelian objectives of policing were to ensure safety and security of person and property with the help of the community as well as prevent and detect crime [21], policing around the world became an ‘extraordinarily complex endeavour’ [22] due to changing demands and new challenges including technological advancement and changing patterns of crimes [23]. Police Officers do not spend a great deal of time in dealing with theft, robbery, and burglary that they did in the earlier days. Nowadays they deal with rapidly evolving crime threats such as terrorism, cybercrime, and serious and organised crime. Yet for the public, their role as citizens in uniform and bobbies on the beat as portrayed in the ever popular BBC series ‘Dixon of Dock Green’ (1955–1976) has not been lost as they still need to help the people whenever necessary. This is especially the case when austerity has meant a reduction to other public services in the UK leading to increasing demand on the police service, for example assistance with mental health-related incidents [24]. Yet, there was a saying ‘if you want to know the time, ask a policeman’ ([18], p. 78), people still call the police to help them with non-crime incidents even to buy some groceries for vulnerable residents.
The role of a police constable is one of the oldest professions in Great Britain as its history dates back to 1285 Statute of Winchester, attestation of constables following an Act of Parliament in 1673, Bow Street Runners of 1749, the establishment of the City of Glasgow Police in 1800 and finally the creation of a full-time formal police organisation for London, the Metropolitan Police, in 1829. However, the establishment of the Metropolitan Police, a brainchild of the then Home Secretary Sir Robert Peel, who later served as a British Prime Minister, is seen as the introduction of the ‘modern’ public policing in the world; as a result, policing became a career that offered status and security at the end of the nineteenth century [25].
It was after 100 years since the establishment of the Metropolitan Police, serious efforts were made to develop police training. The Metropolitan Police College at Hendon was established in 1934 as a military-style institution with the intention to train the serving and newly recruited officers for senior rank. The idea originally came from the Indian Police Service (IPS) that used to recruit officers in senior ranks called probationer Assistant Superintendent of Police. The Assistant Commander of the College was seconded from the IPS. In five intakes, 188 officers were graduated from the college to become inspectors until the institution was closed in September 1939. The college was not re-opened in the same format after the Second World War. Instead, in June 1948, the new National Police College (known as the Police Staff College since 1979) was established at Ryton-on-Dunsmore, near Coventry, to run different training courses for higher ranking officers with potentials to become senior police officers [26]. The college ran residential and non-residential junior, senior, and short courses and also overseas command courses for promising officers, and a scholarship scheme was available [27, 28].
Turning to the London Metropolitan Police ‘was the first modern police force in a nation with representative government’ ([29], ix) and the British bobbies ‘occupy a special place in the history of policing in the world’ and was ‘a role model of successful policing’ ([30], p. 435). The initial recruit training played a great role in turning an ordinary citizen into a uniformed policeman. The Metropolitan Police Training School for constables was established at Peel House in Regency Street, Pimlico in 1907, which was there until 1974, and the Metropolitan Police College in Hendon was rebuilt and opened in 1974, popularly known as the Peel Centre [31].
Historically, initial police training was known as the foundation training or basic police training in the UK, which was followed by police organisations around the world, in particular, in former British colonies. Many national police forces such as the Bangladesh Police still run the same initial police training for the new recruits. After World War II, the specialist cadet college for direct entry senior officers for the Metropolitan Police was turned into a Metropolitan Police Training School for recruit constables. The 17-week initial training was run at Hendon until 2007. However, since the 1960s, intense pressure to change the patterns of recruiting and training for the police force has led to an emphasis on recruiting graduates and since then support for higher education has grown [32, 33].
In addition to Hendon, organisations such as the National Police Training (NPT) (a Home Office unit established in 1993, following the Police Training Council’s recognition of problems with the arrangements for managing police training in 1992), the Central Police Training and Development Authority (CENTREX), and the National Policing Improvement Agency (NPIA) were involved in running the initial police training in England and Wales [34, 35]. The NPT aimed at bringing greater coherence to all police training establishments including the Police Staff College, Police Training Centres (PTCs), the Police National Computer School, a centre for the design of training and training of trainers at Harrogate and a centre for the training of surveillance techniques for National Crime Squad officers at Loughborough [36]. CENTREX took over from the NPT in 2002 [37] and ran the Probationer Training Programme at six PTCs in various parts of the country, namely Bruche, Ashford, Durham, Bramshill, Ryton-on-Dunsmore, and Cwmbran. In 2007, the functions of CENTREX were merged with the NPIA, which was dissolved in 2013 and the newly established College of Policing took over some of its responsibilities.
In 2006, the new 26-week IPLDP was introduced and it became the responsibility of the respective police forces to train the newly recruited constables. Since 2010, a level 3 qualification called Diploma in Policing was awarded to the recruits upon successful completion of the IPLDP training, which used to run week by week in four phases, that is induction, community placement, supervised patrol, and independent patrol. The academic qualifications proposed by the PEQF have been gradually replacing IPLDP and it is expected that by 2020 all the forces in England and Wales will run the PEQF programmes1. However, the Metropolitan Police is still in the process of implementing the PEQF and it is expected to run the PCDA and DHEP programmes from September 2020.
Following the government White Paper ‘Policing A New Century—A Blueprint for Reform’ [38], the report of Her Majesty’s Inspectorate of Constabulary (HMIC) entitled ‘Training Matters’ [39] and BBC’s the Panorama show entitled ‘The Secret Policeman’ (2003) that exposed racism in the regional Police Training Centre at Bruche had a significant impact on the long-lasting police training. As a result, the government came forward to reform the initial police training. Charman ([35], p. 73) argues that:
The creation of the College of Policing in 2012 as well as the Coalition government’s approval of the professionalisation agenda of policing and recognition of policing as a graduate level occupation led to the introduction of the PEQF in 2016. It is worth mentioning that as an indirect impact of this new professional body, the world famous Police Staff College, which was relocated to Bramshill in 1960 from Ryton-on-Dunsmore, popularly known as Bramshill, was closed in 2015 where many senior police officers from the UK and Commonwealth countries have undergone professional development training since 1948.
In 2017, the Police Minister Brandon Lewis MP while speaking at the PEQF conference identified the successes of the College of Policing in introducing a code of ethics, beginning a culture of continuous professional development (CPD), continually growing the body of professional knowledge, and establishing the final pillar through the PEQF as standards of professional qualification for policing. The Minister identified the implementation of the PEQF in cooperation with HEIs as ‘a really big challenge’ and justified the argument for professionalisation of policing as he stated that:
The notion of the police as a profession is not new [41]. Across different professions, professionalism is changing and being challenged and changed as professionals now increasingly work at scale [42]. However, the policing professionalisation agenda of the College of Policing and the ‘Policing Vision 2025’ recognise policing as a graduate level occupation similar to those professions requiring specialist degrees in the relevant subjects such as doctor, social worker, and teacher [43]. This ‘Policing Vision 2025’ has been developed by the Association of Police and Crime Commissioners (APCC) and the National Police Chiefs’ Council (NPCC) in consultation with the College of Policing, National Crime Agency, staff associations, and other policing and community partners. Neyroud [44] refers to a new professionalism in policing in England and argues that it focuses on improving and developing effective practice and building partnerships between higher education and police practitioners.
It is imperative that as a professional, police officers must be allowed a high degree of individual autonomy and they should have independence of judgement. The common elements of any profession to serve in a professional manner include a specialist knowledge and ethical practice related to that profession, scope for CPD, and certain standards set out to educate for that profession [45, 46]. But critics argued that knowledge-based policing in practice promotes a concept of knowledge that indirectly threatens the police officers’ traditional experience-based knowledge and professional discretion [47].
According to the College of Policing [13], there is a lack of consistency in relation to nationwide educational background or qualifications for all roles or ranks within the police forces, which provide knowledge and skills to meet the current and future challenges. It also says that:
It noted that the PEQF supports the NPCC and APCC’s ‘Policing Vision 2025’ that ‘By 2025 policing will be a profession with a more representative workforce that will align the right skills, powers and experience to meet challenging requirements’ ([13], online).
After long consultations, the College of Policing introduced the PEQF and three routes to recruit police constables. Before the PEQF, the IPLDP was introduced in 2006 as a level 3 Diploma in Policing [48] that replaced the Foundation Training (still carried out by many police organisations around the world), which is still in use in some forces including the largest force London Metropolitan Police.
For clarity, it is worth mentioning here that Scottish Police runs Police Officer Recruit Training in line with the Police Scotland National Framework for Quality Assurance in Training and Education and therefore they are not part of the PEQF. Police Service of Northern Ireland runs its own foundation training for the recruit constables at the Northern Ireland Police College, which includes a 23-week Student Officer Training Programme that follows attestation ceremony and Probationer Development Programme. Due to the length, discussion about these programmes is beyond the scope of this chapter.
In 2016, the College of Policing announced that new police officers in England and Wales would have to be educated to degree level from 2020 onwards [49] as the ‘Policing Vision 2025’ recognises policing as a graduate level occupation. With record numbers of British students attending universities, it would be the best opportunity for preparing the next-generation professional on police studies. A formal possession of specialised knowledge credentials is considered as a key characteristic for the enclosure of a profession [50]. That is why Livingstone and Antonelli ([51], p. 26) argue that ‘The most powerful professions have historically used the requirement of a high level of academic education as a primary criterion for entry into the profession’. They also highlight that:
As an advocate of the professional model, Stone recommends that ‘a college or university degree (or comparable educational qualification) to be adopted as the basic educational requirement of a professional police officer’ [52]. Providing the Government of the UK learns its lesson from cutting funding in Nursing and ensures sufficient financial support for all new Policing students, HEIs could be able to train 5000 new police officers a year, based on last year’s intake into the police force [51]. It is expected that ‘By 2025 British policing will have risen effectively to new challenges and will continue to be highly regarded by both the British public and internationally as a model for others’ ([52], p. 5).
The recommendations of Neyroud Report (2011) [53] ‘represent a fundamental overhaul of existing practices’ ([53], p. 67). From these recommendations, Stanislas [54] focuses on four specific recommendations ([53], pp. 47-48) such as ‘full professionalisation of the police which in his view is critical to improving its status, clarifying areas of accountability and meeting public expectations’; establishment of a single professional body responsible for important aspects of policing, which will set national standards for entry and progression within the service, in particular a new pre-entry national qualification and a new qualification for police managers; and finally that ‘the police training and education be devolved outside the police training establishment and delivered in partnership with HEIs and specialist police training centres’ ([53], p. 67).
In 2012, the College of Policing was established as a national professional body to improve police training in England and Wales drastically. There were arguments from academics and professionals for acknowledging policing as a graduate level occupation similar to doctors, teachers, and social workers who need a relevant degree to be qualified for their job [55, 56, 57, 58, 59, 60, 61]. From this realisation, the then Home Secretary, Theresa May, was in favour of this major shift and asked the College of Policing to develop a qualification framework for police officers to get a relevant degree.
David Cameron’s coalition government (2010–2015) approved this qualification framework. Wood ([62], p. 1) argued that the development of the PEQF was ‘Bolstered by the recommendations of Neyroud [53] and Winsor [63], both of which promoted closer collaboration between policing and academia’ in their reports of two government reviews entitled ‘Review of Police Leadership and Training’ [53] and ‘The Independent Review of Police Officer and Staff Remuneration and Conditions’ [63].
In building the evidence base in policing, it is very important to ensure that police officers can develop their skills, build their knowledge and expertise about what really works in policing and crime reduction so that they can put it into their practice [64, 65]. Through the partnerships, the police forces will be trained by the experts from a wide range of academic disciplines including policing, criminology, criminal justice, forensics, law, psychology, and cyber security from HEIs [66]. They will be able to learn new skills, understand more about why crimes are committed, the relationship between crime and society, and use that evidence in innovative ways in their policing practice. However, the aim is to establish long-term partnerships between police forces and HEIs to deliver a recognised body of knowledge, evidence, and expertise on policing and crime reduction, and have the potential to meet the needs of the challenging environment through innovative solutions [67, 68].
There are many partnerships across the UK between a police force and a university or a consortium of universities with several forces. Universities or consortiums need to bid to obtain a contract to provide education and training programmes, for example for 5 years with a force to provide their services. A force cannot award the contract to a local university without a competitive bidding process. Several successful procurement processes have already been run. So, for instance, Cumbria Constabulary and Lancashire Constabulary went for a joint tender and the contract was awarded to the University of Central Lancashire. Liverpool John Moores University obtained a partnership contract from Merseyside Police. It established the Liverpool Centre for Advanced Policing Studies (2015) and provides teaching to the trainee officers of their local force. University of West of England received the PEQF contract from Avon and Somerset Constabulary while the University of Northumbria runs similar programmes for Durham Constabulary and Northumbria Police [69, 70].
Some universities individually received contracts with several forces while some HEIs formed consortiums and are in contract with several forces. For example, Staffordshire University is running the PEQF programmes for four forces in the Midlands, that is Staffordshire, Warwickshire, West Mercia, and West Midlands, and their academic staff travel to the forces’ headquarters [71]. The Police Education Consortium has been formed by four universities, namely the University of Middlesex, the University of Cumbria, Canterbury Christ Church University, and the University of Portsmouth, which is in a contract with Surrey and Sussex Police and Hampshire Constabulary to run the PCDA programme and DHEP.
In November 2019, Babcock International, an engineering organisation in the security and defence sector, which also offer recruitment services, received the £309m worth contract valid until 2028 as the learning partner of the London Metropolitan Police [72]. They formed a consortium with four universities namely Brunel University London, the University of West London, the University of East London, and Anglia Ruskin University to teach the newly recruited officers of the largest police service in the UK with 31,746 police officers (as of March 2020) and 25% of the budget for the police in England and Wales [73].
Regarding the current partnerships, one of the interesting observations is that only the post-92 universities came forward to develop police partnerships and run the PCDA programme and DHEP. Most of those involved such as Middlesex, Portsmouth, and Liverpool John Moores University have long-standing reputation for teaching and researching policing, criminology, and criminal justice. However, some HEIs without an established presence in teaching and research in policing, criminology, and criminal justice stepped in for the PCDA programme and DHEP.
This partnership is an opportunity for HEIs to support the police services for professional development of their officers through enhanced education techniques and research-informed teaching utilising an established evidence base. It is one of the main reasons for the universities to develop their partnerships with the police forces to design, develop, and deliver these academic programmes. Undoubtedly as part of these contracts, HEIs will receive a considerable number of students as the police forces are continuously recruiting to meet their recruitment targets. In addition to regular recruitments, the Government promised (publicly known as ‘Boris 20,000’) to recruit extra 20,000 new police officers [74], which is again an extra boost for both the forces and HEIs. In fact, the partner HEIs will receive several cohorts of student officers throughout the year and they need to be flexible concerning the start date of the cohorts and compromise their traditional term dates to accommodate several intakes in an academic year.
The PCDA is a 3-year apprenticeship degree programme titled BSc (Honours) Professional Policing Practice for someone who has already completed their A levels or BTEC at level 2 and 3 or who are the former members of the Armed Forces. To enrol for this work-based learning programme where the uniformed students will study alongside their operational duties, one needs to join as a police officer first and then pursue the 3-year course as apprentices and will progress from academic level 4 to level 6 (degree level) when student officers need to spend 20% of their contract hours for their academic learning. However, this is a requirement set out by the College of Policing, which is different to the funding rules within the PCDA set by the Education and Skills Funding Agency (ESFA). This 20% protected learning time has been seen very much as an abstraction issue rather than how it is as an ‘investment in learning and development’. This 20% has become a significant barrier in the development of some programmes and disproportionately influenced the design of some programmes. This again hampers the opportunity to reach the full potential and development opportunities of these programmes and partnerships.
This is an opportunity for someone who wants to earn £20,880 per annum (varied from force to force) while achieving a professional degree in government’s expenses [75]. Entry requirements also vary from force to force. However, within the Derbyshire Constabulary, the entry requirements for policing apprenticeship is Level 2 Qualification in Maths and English (Grade C/4 and above), for example GCSE, Functional Skills and a Level 3 Qualification (A-level or equivalent) equal to 64 UCAS points for anyone aged between 18 and 55 years and the UK, EU, or Commonwealth citizen with no restrictions on leave to remain in the UK [75].
The College of Policing has outlined the National Police Curriculum (NPC) for the three new routes to become a police constable under the PEQF, and HEIs in consultation with their partner force(s) develop their programme and modules in line with the national curriculum for the PCDA, DHEP, and Pre Join degree in Professional Policing Practice and obtain approval from the college [76]. Even officers and police trainers are involved in developing learning materials. However, the name of the modules may not be the same. But the overall programme and modules need to fulfil the requirements of the NPC. Williams et al. ([77], p. 260) are critical about the development of the curriculum that ‘on implementation, academia has a responsibility to develop police education in ways that it can achieve this critical feature of the PEQF’ and indicate ‘a risk of limiting the opportunities provided by the PEQF to deliver a real change to current police training unless the curriculum includes wider forms of knowledge, from the historical research on policing to the evaluative research tantamount to the “what works” agenda’. However, the NPC is very prescriptive about what should be taught and as a result of this prescriptive nature, this could prevent all the benefits of higher education being accessed by the students who undertake these programmes. This is particularly relevant where the PCDA is compared to the DHEP as same content is delivered at different levels.
As prescribed by the NPC, the 3-year programme will be divided into several phases, which is a very traditional approach to delivery. For example, at the beginning of the PCDA student officers will continue 22 weeks of learning that will follow guided practical learning with a one-to-one mentor for 10 weeks. In addition to reflective practice and formative assessment, students’ operational progression will be assessed continuously while summative assessments will be done for every module. However, it is very important to move forward from this prescribed delivery approach by adapting a more work-integrated professional practice approach [78].
Programme design and development vary from university to university. Some HEIs run the following modules for their PCDA programmes, which starts gradually some from the beginning, some during the company period when officers will learn more about practical policing with their employer and some modules when they achieve independent patrol status to become operational:
Some other partnership developed the PCDA programme in slightly different way, for example Derbyshire Constabulary adopted the following 3-year programme (Table 1).
INITIAL PROFESSIONAL DEVELOPMENT |
Year 1 |
Academic Level 4 |
Operational Deployment |
Tutor Patrol Phase |
Obtain Independent Patrol Status |
CONTINUOUS PROFESSIONAL DEVELOPMENT |
Year 2 |
Academic Level 5 |
Response Policing |
Community Policing |
Policing the Roads |
Information and Intelligence |
Conducting Investigations |
ADVANCED PROFESSIONAL DEVELOPMENT |
Year 3 |
Academic Level 6 |
Specialism from Year 2 |
Evidence Based Research Project |
Academic Assessment |
Reflective Presentation and Panel Discussion |
Operational Competence Portfolio |
Adopted from Derbyshire Constabulary ([75], online).
Currently, faculty members from partnership universities go to police headquarters to teach and tripartite review of the PCDA students in makeshift temporary classrooms. Blended learning approaches are used to provide learning support including delivering little face-to-face master classes, and making all teaching and learning materials available to students via online workbooks and reading lists. Student constables rely upon their handheld devices, that is iPads and laptops connected via Wi-Fi access at force headquarters, police stations where they are attached for their field training and also at their home as the trainee officers stay at home and travel to police headquarters and police stations.
The DHEP is a 2-year Graduate Diploma in Professional Policing Practice programme in academic level 6. This programme is for the newly recruited constables who have a university degree in any subject except in policing. They pursue this 2-year course to learn the theoretical knowledge of policing while they in fact apply their knowledge in operational policing. The student officers recruited under the DHEP pursue work-based learning while they work as trainee officers with respective forces in various locations. They can access the online learning materials including audio-visual materials and use them at any time from any location and can engage in their academic learning activities. They earn £24,177 per annum (varied from force to force) as an officer from day one while they pursue on and off-the-job learning through this graduate diploma programme at the expense of the government during their probation period [79].
Some forces post attractive videos as part of their recruitment campaign, which outlines the recruitment process in particular how the candidates will spend half a day at the force’s assessment or recruitment centre undertaking a written test, taking part in role-play, and finally being interviewed to become a police officer [80]. Fast track detectives are also recruited under the DHEP and they follow the same syllabus except learning one or two specialist modules and spending a significant period of time at specialist departments such as CID (Criminal Investigation Department). It is understood that the forces received overwhelming response from the potential detectives for the exciting and challenging Fast-Track Detective Development Programme [81]. However, confirmation of permanent employment as a police constable is subject to the successful completion of the course. Structure of this graduate diploma programme is described below:
This PJD programme is a standard 3-year university degree programme entitled BSc (Hons) in Professional Policing. The prospective police officers pursue this course at their own expense and upon successful completion of the degree they can apply to join any police force in England and Wales. They need to learn theoretical knowledge of policing, criminology, and criminal justice as well as various aspects of operational policing over 3 years.
The police role was heavily criticised in dealing during Miner’s strike (1984-85), Brixton riot (1981), Hillsborough tragedy (1989), and Stephen Lawrence’s murder (1993). Reiner [13] noted that despite initial opposition of the establishment of the Metropolitan Police by the London working class, the police achieved legitimacy over 100 years (1856–1959) through ‘policing by consent’, but he argued that the police again lost public’s trust and confidence for its politicisation in 1960. It again deteriorated after the Metropolitan Police was labelled for being institutionally racist by Sir Macpherson in his report [82] on Stephen Lawrence’s murder and the Metropolitan Police’s total failure in dealing with the investigation was exposed in this unprovoked racial attack in South London.
In the context of strong criticism of police application of unreasonable force against the protesters in the 1960s and 1970s, the Royal Commission on Criminal Procedure in its report (1981) proposed specific legislation and code for police work to ensure its accountability and as a result the Police and Criminal Evidence Act 1984 (PACE) was introduced with specific codes for police conduct. Following the Brixton riots (1981), Lord Scarman Report (1981) identified socio-economic factors for violent protest. Policing became a political agenda when Tony Blair declared during the 1997 election campaign that labour would be ‘tough on crime, tough on the causes of crime’. He introduced the ‘Crime and Disorder Act 1998’ just after the election that included Anti-Social Behaviour Order (ABSO) in section 1 and later brought the ‘Police Reform Act 2002’.
In answering the question ‘Why degree level education?’, the College of Policing justified that the existing recruit training (IPLDP) was not designed to meet the demands of policing to analyse and solve the complex problems where officers have to make difficult decisions and take responsibility for their actions. However, the serving officers mostly learn to do these on the job with additional training. The new academic professional qualifications ‘will give probationary officers the best chance of reaching the level of expertise found in serving officers’ ([13]: Online). The college further explains the nature of the new programmes:
It is expected that through the higher education programmes, police education and training will make expected changes for developing professionalism with the policing practice and make a cultural shift [83, 84, 85].
As has been mentioned, the idea of introducing academic qualifications for policing was challenged by the Chief Constable of Lincolnshire in July 2019 arguing that it will put an extra burden on the police forces due to time and resource constraints [86]. The review petition relied on the academic argument of Brown ([8], p. 9) that ‘the current body of research evidence is methodologically weak and there remains a gap in the literature for the provision of a convincing, unambiguous empirical case demonstrating the value added by graduates to policing’. The High Court rejected the application for permission for judicial review of the PEQF in December 2019. However, it is still in a very early stage to determine the success and failure of the three newly introduced routes [87, 88].
Several HEIs started running the College of Policing’s approved 3-year Pre-Join degree BSc (Honours) in Professional Policing degree programmes from September 2019. As it is run as a regular academic programme by the universities, licensed by the College of Policing that approve the universities’ programmes in line with the syllabus given by them, it will be easier to successfully run the course. But it is difficult for the HEIs to recruit enough university staff with experience of operational policing, and knowledge of policing, criminology, and law to run this degree programme.
There is no alternative for the student police officers to learn both on-the-job and off-the-job as they need to learn the operational aspects, that is the real-life policing as well as theoretical aspects of policing to apply the knowledge to the relevant police work [89]. It is anticipated that there is a division of labour between the HEI and the force, although how this is implemented in practice varies across the country. However, in summary, the force is expected to deliver basic training such as how to handcuff suspects while the HEI is to provide the evidence base and critical arguments concerning their efficacy. It is rather like a driving theory and practical tests that one needs to successfully go through to be allowed to drive vehicles on the road to ensure his/her own safety as well as the safety of the other road users. Therefore, the nature and scope of the PCDA and DHEP courses and learning are characteristically different from regular degree courses as these involve students gaining knowledge, acquiring skills, and developing attitudes and behaviours to prepare themselves to face the challenges of modern-day policing.
As a profession-oriented course, the PEQF programmes are aimed to prepare professional police officers and one of the major challenges the teachers face is in bringing ‘the field into the classroom’ and ‘the classroom to the field’ [90]. Incorporation of practice is essential in professional degree courses. It is proven that successful professional courses need to integrate theory and practice to bring the field into the classroom as well as take the classroom into the field [91]—so that student officers can learn theoretical knowledge about crime and policing as well as legislation and procedures in the classroom and return to field learning at their units. Following application of their knowledge in practical policing, students can pursue further learning online and come back to the classroom. According to Wrenn and Wrenn [92], then they share their experience with their tutors or trainers and ask, ‘How did you handle that?’ Following further discussions the teacher can present more scenarios and ask them, ‘What would you do in a case like that?’ ([92], p. 259). The trainee officers find this method is really helpful and effective for learning as Boud et al. [93] suggest that when an example from one\'s own experience is shared learning occurs. Therefore, emphasis on experience is hugely significant rather than mere listening. As a result, ‘the theory becomes clearer and more easily applicable to the real cases they face in a practice situation’ ([92], p. 259).
Practice needs to be embedded in knowledge only Pre-Join Degree in Professional Policing, however, critical reflective thinking also needs to be embedded in the overall academic programmes based on the PEQF [10]. As degrees in Professional Policing Practice are professional and service-related studies, the main focus is not only to learn theories but also to learn how to apply the theories in practice. Hutchings ([94], p. 1) argues that ‘What’s at stake is the capacity to perform, to put what one knows into practice’ to help students develop as professionals who are able to deal with real-world problems [95]. In learning programmes such as police education, the ability to gain and utilise knowledge from practice [96] and skill building [97] is pivotal as the best learning environment is created when experience and knowledge are integrated within a course such as the DHEP and PCDA.
Experience of police training in various parts of the world shows that the police students prefer on-the-job training to academic studies such as driving police vehicles, shadowing patrol teams, or practising situations for quick and better understanding of practical policing [98]. Therefore, bringing field experience to the classroom of the DHEP and PCDA learners is mandatory as the popularity of reality TV shows proves that people prefer watching other\'s lives unfold. Enhanced learning models should be applied in police training so that learning can be made relevant, useful, and effective by bringing the real world of policing into the classroom. This will create an opportunity to stimulate the innovative, common sense, and dynamic learners as McCarthy [99] emphasises on educating the ‘whole brain’ in addition to educating all types of learners. Most importantly, student officers\' voices should be heard and their views should be taken into account in planning, designing, and delivering these academic programmes. Their learning expectations should also be considered as the potential police officers consider policing as a job as practical, exercised on the street, close to people, and with hands-on duties rather than sitting behind an office desk [100]. At the same time, it needs to be appreciated that the aim of the newly introduced three routes of police recruitment is to ultimately help to develop police studies as a well-established academic discipline.
Wrenn and Wrenn ([92], p. 258) argued that ‘Educators in professional or service-related fields desire their students not only to learn theory and understand why theories are important but also to learn how to apply the theoretical frameworks in practice’. This is absolutely applicable in the case of teaching and learning in Professional Policing Practice degree programmes. Lecturers and police trainers should assist the students to learn how to apply their knowledge and skills in practical policing and help them to develop their attitude and behaviours accordingly. Integration of practice and theory is the central consideration of all learning [93] and students learn by doing and solving problems in real-life contexts [101, 102]. Rief ([103], p. 53) noted that students retain ‘10% of what they read, 20% of what they hear, 30% of what they see, 50% of what they see and hear, 70% of what they say and 90% of what they say and do’. A study by Kramer et al. [104] found that students taught by a practising faculty member scored higher as Good and Schubert [105] argue that they are able to relate theory to practice effectively. Genuine knowledge, understanding, and skills derive not from abstract thoughts, but rather by integrating thinking and practical application of the same.
Undoubtedly an active learning environment enhances the integration of practice and theory in the classroom involving students [106]. However, a substantial amount of materials provided for these academic programmes is self-learning materials access through Virtual Learning Environment (VLE). It is, therefore, essential to make the online learning materials more interactive as most of the time the trainee officers have to engage with their online materials. These also need to be presented in an organised way so that student officers from diverse academic backgrounds find the provided materials user-friendly and to help them to bridge their knowledge and skill gaps to provide a comfortable and enjoyable learning experience.
Because of the nature and structure of these programmes, different blending learning approaches are useful as the students can access their learning materials at any time from anywhere [107]. Apart from online live sessions, all electronic course materials could be downloaded in their devices and used offline. However, for online access they would require internet connection whether they are at their homes or workplaces (police headquarters or police stations). In practice, some may struggle to have uninterrupted broadband access and some of them struggle to obtain proper connections at police premises due to existing restrictions.
In Australia, Charles Sturt University works with the NSW Police Academy where university lecturers and experienced police trainers teach and run university courses and officers are awarded a degree by the university. Police trainers need to involve students in the classroom and keep in mind that an active learning environment enhances the integration of practice and theory in the classroom by engaging students. As part of online learning and face-to-face master classes, students need to be involved in various activities as activities allow students to clarify, question, consolidate, and appropriate new knowledge [108]. However, although experience may be the foundation of learning, it does not automatically lead to it [93] and experiences alone is not enough for learning to take place and it requires a theoretical base.
Unlike previous contents for police training, the modules developed for the PEQF programmes highlight vulnerability, legitimacy, equality, diversity, and ethical issues along with the National Decision Model [109]. These are the changes that highlight transformation of police education, in particular to prepare the newly recruited officers with necessary knowledge and skills to fulfil demands of time as well as to develop their skills, attitudes, and behaviours to bring them outside the traditional rank and file mindset and police culture.
One of the key issues about the nature of partnership related to the leadership could be a challenge. There could be debates whether this academic and professional partnership should be led by HEIs or the police forces. In most cases, these are HEIs which lead the partnerships so that they can comply with the national Apprenticeship Standard for the PCDA programme [110]. Some forces may choose co-delivery approach and some may decide for their programme to be the police force led where they will develop course materials in line with the NPC and will be approved by the partner HEIs. In those cases, the main workload will be on the partner forces to implement the programme. Questions may be raised about the quality assurance and student learning experience of this type of programme. Within the HEIs, there are discussions whether the PCDA, DHEP, and Pre-Join degree programmes should be led by a pure academic or a practitioner-turned-academic as they are involved in curriculum design, development of course materials, coordinating modules and assessments, and running the overall programme. However, they need to decide on the availability of people with relevant knowledge, skills, and experience. The differing partnerships may also raise issues in regards to the uniformity of delivery across the country.
There has been a reduction in the number of police officers, trainers, and training facilities [111, 112]. To address the shortage of police officers, when the Prime Minister Boris Johnson announced in 2019 to recruit 20000 new officers for the police forces across the country, neither the police forces, nor the HEIs were prepared although some universities in the UK have a long-standing working relationship with the police service as they helped the forces in developing their training programmes ([54], pp. 62-63). Though the College of Policing welcome the policing pledge to address the shortage of police officers by recruiting 20,000 new officers, but warned of ‘logistical challenges’ at the time to achieve the goal, following the closure of police stations across the country as well as concerns over the lack of training instructors [113]. In particular it is argued here that there is a scarcity of academics in policing and practitioners-turned-academics into policing as there is a shortage of suitable teaching staff. Against the advertisement for recruiting faculty members, the response rate is very low. HEIs need a good number of staff to run the PCDA programme and DHEP.
As part of the role, the academic staff, that is programme leader, module leaders, and work-based tutors and assessors need to travel to the police forces’ premises. Therefore, it is a mandatory requirement for them to go through level 2 Non-Police Personnel Vetting (NPPV) or Disclosure and Barring Services (DBS) process by the relevant forces. Some academics may not be necessarily willing to go through the process, which will ultimately limit their access and contribution to the police headquarters, police stations as well as specialised software such as Aptem as access is strictly maintained by the forces. Students will have access to the College of Policing’s Managed Learning Environment (MLE) for further reading such as Authorised Professional Practice (APP) in addition to HEI’s VLE, for example BlackBoard, Canvas, or Moodle for online learning materials.
Some HEIs are in favour of recruiting former police officers and in some cases officers from the same force they are in a contract with as they know the force well. While other HEIs are in favour of recruiting pure academics and practitioner-turned-academics to lead the programme and modules by ensuring academic standards. They argue that police trainers are enough to teach the practical aspects of policing and, therefore, ex-cops are not necessarily important to link theory into practice. In the context of police education in the USA, Sherman [114, 115] recommends based on a 2-year national study that full-time faculty members with PhD should be employed, not to make prior criminal justice experience as one of the essential criteria for recruiting faculties to run the academic programmes. However, there is a set of factors, as we are discussing in this chapter, for understanding the processes linking demands for further development in police education and practices [54].
As an example, Babcock International recruited lecturers and tutors, a mixture of former police officers and traditional academics, to run the PEQF programmes in conjunction with the consortium universities in London. Some universities are still in the process of recruiting programme leaders and module leaders and are facing difficulties due to lack of suitable candidates. Moreover, other universities also recruit teaching and research staff with similar backgrounds to run their existing programmes in criminology, policing, and criminal justice as this is a rapidly expanding subject area. Jones ([116], p. 232) noted that ‘in 2015, the Universities and Colleges Admissions Service (UCAS) identifies 48 higher education institutions (HEIs) in England and Wales offering undergraduate policing degree programmes’. HEIs also need to recruit work based tutor and assessor to help the module leaders and police trainers in particular to do tripartite reviews of the PCDA and DHEP students and to provide them pastoral support.
Pursuing an effective tripartite review involving three parties, namely the student officer, university, and the police force (employer) is a major challenge for the successful continuation of the PCDA. Although there is no such mandatory requirement for the DHEP, it will use the best practice of the PCDA to pursue tripartite review. Academic staff and work-based tutor-assessors face practical difficulty to travel to various locations of police units in the force area, where the student officers are attached, to run face-to-face tripartite review. Throughout the tripartite engagement and collaboration, the complex process of quality assurance to satisfy both HEI regulations and College of Policing requirements is a real challenge in addition to meeting the requirements of the Institute for Apprenticeships and Technical Education that approved the PCDA programme for delivery in March 2018 and Office for Students [117]. The effective relationship between university staff (i.e. lecturers, module coordinators, or programme leaders) and police trainers is very important for this tripartite engagement and collaboration.
Since Macpherson’s report published in 1999, there is still significant challenge for the police service to diversify its profile. The expectation of the NPCC is that by 2025 policing will be a profession with a more diverse workforce which mirrors the UK’s population. While there has been a large increase in the numbers of female officers over time, there are still ongoing issues in regards to the recruitment of BAME staff and in particular black police officers. For example, in London, the Met head of recruitment, Clare Davies [118] commented, “If we continue even with the great progress we’ve made it would take over 100 years to be representative” of London. Currently, 58.4% of black people live in London, a population of between 1.1 and 1.2 million. Black people make up 15.6% of London’s population whereas they number only 3.3% of metropolitan police officers. The PEQF routes should be an excellent opportunity for this community as for black Londoners, on average in 2016, 8% of first-year undergraduates across the UK were black. In the same year, London has the highest proportion of black students, making up 17% of students overall [119]. However, initial impressions from recruitment outside of London are not positive as the initial cohorts do not reflect this aspiration for diversity.
Although, the Macpherson’s report recommended the recruitment of more black officers and this has been followed by further diversity initiatives, it is still the case that either members of the BAME community are not able to satisfy the criteria and successfully go through the selection process or more likely, are not willing to serve in the force. Nevertheless, forces are still encouraging application from under-represented black and ethnic minority candidates to apply to become a police constable [79]. Apart from diversity in recruitment, interestingly some forces received a tremendous response for fast track detective roles [120].
According to the Guardian’s list of top universities, no university in the top 20 applied to deliver the PEQF programmes. In London, all the top-ranking universities did not show any interest to be involved in running PEQF courses although London School of Economics and Political Science (LSE), Kings’ College London, and the University College London (UCL) lead policing and criminology research globally. Only HEIs such as the University of East London, the University of Law, the University of Cumbria (London Campus), and Coventry University (CU London) offer pre-join degrees in policing.
While designing learning materials for police studies to teach student officers, the ‘diverse range of operational challenges’ identified by Reiner and Newburn need to be considered [121]. In designing, developing, and delivering the academic programmes, the ‘peculiar features of late-modern society’ [10] need to be underscored for ensuring equity and social justice as ‘one-size-fits-all’ blueprints are not applicable in the changing world of policing. Emerging communication technologies and media indeed brought changes and complexity in police work [122].
In practice, academics and students may find it insufficient to spend only 20% of working hours towards the academic degree while students in regular university programmes are required to study and learn throughout the week. Although it is appreciated that the PCDA and DHEP are perfect examples of blended learning, the syllabus given by the College of Policing is vast and students need to work more and more to learn the course materials, given the fact that most of the materials are online and that involves self-study, although they can contact their module coordinators or trainers at any time for further understanding or clarifications. Moreover, the PCDA programme and DHEP, as technology enhanced blended learning programmes, face significant challenges as there are no PEQF-specific textbooks available although Bryant and Bryant [123] suggest that Blackstone’s Handbook for Policing Students 2020 ‘Covers the learning requirements of all major entry routes into the police service, including pre-join degree courses and degree apprenticeships’.
In particular, the students may struggle to understand legislation and interact more in workshops. It should be considered that the PCDA and DHEP students are not learning to pass their assessments or to obtain university degrees, they will need this knowledge throughout their policing career as the constables are independent decision-makers who attend crime scene, instantly gather information and intelligence, and analyse and make decisions on their next steps to tackle the situation. In doing that, they need to continuously consider the National Decision Model (NDM) as well as National Intelligence Model (NIM) with an emphasis of ethics at the core of the decision-making process as the officers are accountable for their actions and may be liable for any wrongdoings or mistakes for which they may face departmental proceedings or even lose their jobs. Therefore, they need to properly understand the legislation, policy, and guidance such as Police and Criminal Evidence Act 1984 (PACE) and its codes that outline clear guidelines for various police work.
Officers need to understand the paradigm shift of applying their own judgement, common law fairness, and Wednesbury reasonableness to specific legislations such as the Human Rights Act 1998, which makes it mandatory to be considered in any police actions with a minor exception in cases related to counterterrorism actions. Savage [124] argues that the 1998 human rights legislation that incorporated the European Convention on Human Rights has significance for all institutions in the UK but particularly for the police. Officers are required to understand the English Legal System and procedures in the criminal justice system such as how the Magistrates Court and Crown Court operate and what role the defence and prosecution play to ensure justice. Students of Law degrees study the laws and legal procedures throughout their programmes. However, the student police officers will have limited time to cover relevant laws, policies, and guidance from few classroom-based lessons.
One of the major achievements of the PEQF is to shift the main focus of the initial policing training from rigorous physical training to developing knowledge, skills, attitude, and behaviours in addition to the empathy, compassion, and common sense that the British police officers already have. Through the academic programmes, personal and professional development of an individual officer will continuously focus on ethics at the centre of their learning and preparation for their professional career. As a result, police practice will be able to put in first place mandatory consideration of human rights and respect for equality to maintain the pride for democracy and the rule of law in the diverse British society. It is appreciated that police officers, as the law enforcers, need to be physically and mentally fit to perform their challenging duties efficiently. They necessarily need to learn drills, first aid, and law; however, the PEQF will put less emphasis on quasi-military style drill and parade. Rather they will go through essential Officer Safety Training (OST) before they become operational.
The police forces should afford a residential accommodation for the trainee officers in a purpose-built campus with technology-facilitated master classrooms, small classrooms for seminars and group discussions, and assessment centre with required facilities for student officers who need additional support. This is also essential to have the facilities for physical training, arms training, safety training as well as gym, sports centre, and hydra simulation suit to facilitate immersive learning. Should the students reside in the police education premises, they could have time and space for protected learning and they could access library facilities in addition to existing access to the HEI’s library and online resources.
To fulfil the demands of the twenty-first century, successful implementation of the PEQF will assist the society in achieving sustainable development goals (SDGs) related to peace and prosperity through reasonable policing by graduate officers who will be able to make informed decisions by applying their cognitive, affective, and psychomotor skills. As the UK historically led the development of professional policing, if the academic professional qualification programmes based on the PEQF are successfully implemented (as the first PCDA cohort is expected to be qualified in 2021 and the first Pre-Join Degree students will be graduated in 2022), this model of ultimate police education will be followed in other parts of the world especially where countries are seeking effective police reform to overcome the crises of legitimacy and efficacy. However, this model of new policing will bring a significant change in police occupational culture, which has been blamed for many decades for lack of police legitimacy. Savage [123] describes policing as a performing art and its paradigm shift as a process of reform.
Despite the Government of Australia has not recognised policing as a graduate level occupation, the NSW Police Force (NSWPF) has developed a unique programme in partnership with Charles Sturt University (CSU) where the prospective candidates first need to complete the University Certificate in Workforce Essentials (UCWE), a foundation level programme [125]. Then they go through the recruitment process to be offered a police recruit position and enrolment for the CSU-run Associate Degree in Policing Practice (ADPP) at the NSW Police Academy. CSU’s School of Policing Studies is located at the NSW Police Academy to jointly run this course where student officers need to reside at the Academy throughout the week [126]. This 2-year programme also includes a field observation placement in Year 1 that will follow attestation and then the students will pursue the Year 2 studies as probationary constables. However, their employment as police constables will be subject to successful completion of the Year 2 [127].
The Bangladesh Police Academy, Sardah, which was established in 1912 in British-ruled Bengal, still runs the fully residential basic police training [128] with significant emphasis on physical training such as early morning exercise, morning parade, afternoon parade, horse training (for the probationer Assistant Superintendents who join through the national civil service) and less focus on academic learning, arms training, safety training, and driving lessons. However, since 2008 probationer Assistant Superintendents of Police receive a Masters of Police Science degree from the University of Rajshahi upon successful completion of this police-led training. The UNDP-DFID sponsored Police Reform Programme in Bangladesh failed to bring a paradigm shift in police training and culture due to constant opposition of civil bureaucracy and lack of a strong political will as the policy-makers want to keep their strong control over the force [129]. Similarly, many police organisations in the developed and developing world have their own police academies, police training centres such as Louisiana State Police Training Academy, USA that has a residential academy in Baton Rouge with a massive training area including Joint Emergency Services Training Center [130].
The physical learning environment is also crucial for an enjoyable learning experience. In practice, it is argued here that the lack of adequately equipped on-site residential facilities for the uniformed PCDA and DHEP students may have a negative impact in their learning as well as their team spirit as the members of a disciplined force. In this aspect, more could be learnt from the other professional qualifications offered by the universities and should be adapted for these programmes.
Developing Police Leadership is one of the crucial priorities for the twenty-first century’s policing across the globe including the UK [131]. The apprentice-turned-graduates under the PCDA programme, officers with a graduate diploma under the DHEP, and policing graduates-turned-officers are qualified enough to be promoted in leadership roles in 43 forces in England and Wales in the days to come. Although there are five entry routes into policing, namely constable, police staff, Fast Track to Inspector, Direct Entry at Superintendent, and Direct Entry at Chief Constable (for eligible overseas chief officers), most of the senior officers begin as a constable and follow the traditional route to be promoted to lead the forces. Undoubtedly the Fast Track for both new candidates and experienced officers as well as Police Now, which runs the National Graduate Leadership Programme and the National Detective Programme, will play a pivotal role in creating future leaders. However, the question for debate is ‘will the NPC really allow this level of development, or do these programmes set the foundations on which to build leadership more strongly than current training provision?’ which is beyond the scope of this chapter.
According to Bergan and Damian ([132], p. 8), ‘[e]ducation is about acquiring skills but also about acquiring values and attitudes’ which are essential characteristics for leadership in an ethically and economically diverse society’ that also needs a ‘diverse student body’ ([132], p. 9). In the same vein, Bok ([133], p. 19), a former President of Harvard University, emphasises that ‘Our institutions are now the leading sources of all three of the most important ingredients for progress and prosperity in modern societies: new discoveries, expert knowledge and highly trained people’. He further argues that ‘universities are the essential institutions for preparing leaders throughout society. Every politician, every civil servant, every judge, doctor, priest and virtually every top business executive will attend our universities. Although this often goes unnoticed, more and more of these leaders are also returning to universities in mid-career for further education’.
Therefore, university education will help the forces to have more prudent police leaders who can bring diversity of thought and perspective into policing. They should pursue continuing professional development courses throughout their career to obtain up-to-date knowledge and prepare them to lead the forces and achieve legitimacy and set examples for the world. The College of Policing’s Leadership Review ([134], p. 31) recommended to ‘Create a new model of leadership and management training and development which is accessible to all within policing’. It has also echoed the Peelian principles of 1829, which are still relevant for public approval of police work as it states:
Leadership is the one of the keys for an organisation to be efficient, effective, and successful in managing people and achieving goals. Bowling et al. ([135], p. 28) argue that ‘The police are supposedly a “totalizing institution” with a “chain of command”’. Therefore, this is very important for the police forces to develop well-prepared future leadership so that they can lead their respective forces. According to the College of Policing ([134], p. 6),
Generally, police education has been based on a top-down, instructor-led form of teaching by focusing on a student officer’s technical competencies [5]. These approaches are contrasted with the mainstream higher education pedagogies, that is learner-led participatory teaching and learning where critical thinking and innovative ideas are the keys to success [2]. However, very little has been known from research regarding the pedagogical impact of different educational and training pathways into policing [136]. In this light, we are hoping to see wider discussion on the relationship between the NPC and higher education elsewhere between academics and practitioners [136, 137, 138, 139].
In the professional contexts, the police officers’ learning must be followed by reflective thought and internal processing that links the experience with previous learning as learning takes place within a cycle of action, reflection, and application [140]. A study on graduates from a professional graduate programme of Social Work found that class work had not adequately prepared them for real-world practice [91]. Failure to incorporate knowledge in a relevant and meaningful way creates a barrier for effective learning. Practical examples help the learners to understand and apply theories from the textbook to real situations, which enhanced their learning experiences. Similar views were expressed in The Relation of Theory to Practice in Education [141] that content knowledge should not be remote from practical issues. In the initial stage of academic police education programmes, learning may be found difficult by fresh students due to the lack of experiences. However, examples from their earlier life could be created and delivered through a virtual learning environment to assist the trainees in understanding the contexts and link with the theories. They should be given the opportunity to deal with real-life scenarios as student police officers who are too afraid to test their abilities will probably be worried police officers, which is not expected at all.
As a professional course, interpersonal communication skills including critical thinking are very important in police education [142]. The nine Peelian principles of policing are the main mantra of policing, which suggests police officers are citizens in uniform and they cannot succeed without the support and approval from the community [143]. Throughout the curriculum of the professional education programmes, there should be an effective structure for teaching essential interpersonal skills so that student officers get a solid foundation, which enables them to remove some of the barriers between the police force and the public. Initial training through academic programmes builds an essential foundation for new officers because they need to master communication skills before they execute tactical and legal tasks in practice.
Effective policing occurs when police officers and members of the public become partners to create safe and crime-free communities. This partnership requires well-prepared police officers who display not only strong technical capabilities but also interpersonal skills. Therefore, police forces as the law enforcement agencies must train their officers on how to interact effectively with the public and work with them. In the professional setting, technical and interpersonal skills help the offers to perform their police work well.
Police officers face unique challenges and critical discourse as part of their role and they need to constantly reflect on their learning and experience to overcome the situations successfully. It is therefore a key focus of the PCDA and DHEP to make the officers critical reflective thinkers and students reflect and write their reflective journals throughout these work-based learning. There is a pressing need to incorporate the practice into degree programmes for effective learning and developing skills as Hornyak et al. [144] suggest that people learn best from direct experience with guided reflection and analysis. It is also essential for the best student learning experience and to develop necessary knowledge, behaviours, and skills for the student officers to become fully operationally competent police constables.
According to a recent study [145], students who are studying police studies at HEIs quickly assimilated a police identity, which affected their attitudes and behaviour. For fulfilling the potential of the PEQF, police services need to embrace, promote, and enable their police officers to become reflective practitioners through critical thinking and policing must be a reflective practice in the fullest sense [62]. If the recently developed academic police studies programmes are able to provide interpersonal communication skills and critical thinking, only then HEIs will be able to provide radically transformed and well-equipped policing degrees for the better future.
In times of crises or emergencies, there are more constraints imposed on the police forces, for instance, the recent COVID-19 pandemic restricted individuals’ movements and mass gatherings. As a result, education and training programmes have to be put on hold advised by the College of Policing as the situation demanded the forces to deploy more officers to support the operations throughout the country, to such an extent that the Metropolitan Police Service requested the retired officers to come back on a paid or unpaid role and the officers who are approaching their retirement age to not leave the force [146]. Again, due to the emergency situation and imposed restrictions, student officers have been grappling with different problems, for example, staying at home and even looking after some family members, having less time to engage with their ongoing courses. In some cases, they have been struggling to connect with stable internet connections to access the virtual learning environments, in particular during their assessment day to participate in exams or submitting their work on time. In the changed circumstances, they have to sit for online examinations, in some cases for a fixed 2-hour assessment in a 24-hour window. There were concerns about these exams\' compatibility, credibility, and integrity as there was no physical surveillance and learning materials might be available to them during these exams. Although the PCDA student officers were at the very beginning of their academic learning, still there was a pressure on the forces due to the crisis to deploy them operationally after completing their safety training and public order training.
Incorporating practice into professional learning is essential as Clapton and Cree [91] suggest to integrate theory and practice to bring the experiences of the field into the classroom as well as take the classroom into the field. It is commonly accepted that experience is a great teacher; however, it cannot replace a classroom, for example for learning law and legal procedure, and vice versa. To find a balance between theory and experience, similarly in between classroom and practice, the professional policing practice needs to be embedded in its entirety in the Pre-Join degree, PCDA programme, and DHEP. Policing is a life-long learning process; indeed it is a part of the professionalisation agenda, and to ensure this life-long learning to happen the police should be a learning organisation [147, 148, 149, 150, 151].
Recently introduced, these three academic professional programmes are still under experiment as HEIs are running the programmes for the first time in partnerships with the police forces. HEIs and police forces need to learn from their partnerships through different approaches and efforts of ‘trial and error’ to find better ways to prepare future police workforce and they must work out their ways to develop effective partnerships to learn from each other to be successful in achieving the goals of the ‘Policing Vision 2025’. Then this model of partnership for providing police education can be a beacon for other police organisations around the world as the Leadership Review ([134], p. 5) suggests that many around the world envy the British police service and respect it ‘for its strength of purpose and public service ethos’. Especially Commonwealth countries such as Bangladesh, India, Pakistan, Malaysia, and Nigeria, where those countries still are continuing their colonial legacy may be able to reform the recruitment process and education and training programmes of their forces to make a graduate level occupation through academic professional qualifications.
Although the newly introduced police education programmes are at the very early stage of their implementation as none of the three programmes has completed its cycle for its first cohort since introduction, continuous careful consideration is required to understand the challenges and overcome them in due course. This ongoing learning by doing effort is like ‘trying to build an airplane while you are flying it’ as the Chief US Training Officer for the Iraqi National Police Force said while expressing his experience of police capacity building in Iraq [152]. Indeed the recent developments ‘offer new and potentially unprecedented opportunities for HEIs to play a major role in the education of police officers at all levels’ ([54], p. 67). The success of the academic professional qualification programmes based on the PEQF will depend on how stakeholders provide the opportunities to the HEIs to experiment their innovative administrative and pedagogical approaches and assist them to run the programmes as smoothly and flexibly as possible bearing in mind that ‘the politics of the police and policing is complicated’ ([135], p. 20).
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