The truth table of OXADM optical switch.
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Barely three months into the new year and we are happy to announce a monumental milestone reached - 150 million downloads.
\n\nThis achievement solidifies IntechOpen’s place as a pioneer in Open Access publishing and the home to some of the most relevant scientific research available through Open Access.
\n\nWe are so proud to have worked with so many bright minds throughout the years who have helped us spread knowledge through the power of Open Access and we look forward to continuing to support some of the greatest thinkers of our day.
\n\nThank you for making IntechOpen your place of learning, sharing, and discovery, and here’s to 150 million more!
\n\n\n\n\n'}],latestNews:[{slug:"webinar-introduction-to-open-science-wednesday-18-may-1-pm-cest-20220518",title:"Webinar: Introduction to Open Science | Wednesday 18 May, 1 PM CEST"},{slug:"step-in-the-right-direction-intechopen-launches-a-portfolio-of-open-science-journals-20220414",title:"Step in the Right Direction: IntechOpen Launches a Portfolio of Open Science Journals"},{slug:"let-s-meet-at-london-book-fair-5-7-april-2022-olympia-london-20220321",title:"Let’s meet at London Book Fair, 5-7 April 2022, Olympia London"},{slug:"50-books-published-as-part-of-intechopen-and-knowledge-unlatched-ku-collaboration-20220316",title:"50 Books published as part of IntechOpen and Knowledge Unlatched (KU) Collaboration"},{slug:"intechopen-joins-the-united-nations-sustainable-development-goals-publishers-compact-20221702",title:"IntechOpen joins the United Nations Sustainable Development Goals Publishers Compact"},{slug:"intechopen-signs-exclusive-representation-agreement-with-lsr-libros-servicios-y-representaciones-s-a-de-c-v-20211123",title:"IntechOpen Signs Exclusive Representation Agreement with LSR Libros Servicios y Representaciones S.A. de C.V"},{slug:"intechopen-expands-partnership-with-research4life-20211110",title:"IntechOpen Expands Partnership with Research4Life"},{slug:"introducing-intechopen-book-series-a-new-publishing-format-for-oa-books-20210915",title:"Introducing IntechOpen Book Series - A New Publishing Format for OA Books"}]},book:{item:{type:"book",id:"662",leadTitle:null,fullTitle:"Crohn's Disease",title:"Crohn's Disease",subtitle:null,reviewType:"peer-reviewed",abstract:"In this book, several important points regarding Crohn's disease are discussed. In the first section, we focus on etiopathogeny of Crohn's disease and the recent advances in our overall understanding of the disease - specifically, the role of the gut epithelium, alterations of the epithelial crypts, and the roles of the different cytokines in the pathophysiology of Crohn's disease. In the second section, a diagnosis of Crohn's disease is discussed. Another particular area of focus is in the diagnosis of intestinal tuberculosis, and the role of mycobacterium avium in Crohn's disease. 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Rico and Jorge Olcina",coverURL:"https://cdn.intechopen.com/books/images_new/7611.jpg",editedByType:"Edited by",editors:[{id:"211260",title:"Dr.",name:"Sandra",surname:"Ricart",slug:"sandra-ricart",fullName:"Sandra Ricart"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}],publishedBooksByAuthor:[]},onlineFirst:{chapter:{type:"chapter",id:"9698",title:"The Asymmetrical Architecture of New Optical Switch Device",doi:"10.5772/8481",slug:"the-asymmetrical-architecture-of-new-optical-switch-device",body:'\n\t\t
The explosive growth of data and combusting traffic have led to a demanding of flexible, efficient, survivable, and multifunctional device to support all of network functions, management and testing. The sophisticated technologies today had led to realize any complex design in optical architecture that has become impossible for some years ago. The waveguide technologies become the first player in developing the new architecture of optical switch device. The most optical devices today are built by symmetrical architecture. Therefore, they can perform bi-directionally with the same function to both side of incoming signal.
\n\t\t\tThe introducing of new optical switching device named optical cross add and drop multiplexing (OXADM) which has an asymmetrical architecture and can perform bi-directionally function as the previous using the combination concept of optical cross connect (OXC) and optical add and drop multiplexing (OADM). Its enable the operating wavelength on two different optical trunks to be switched to each other while implementing add and drop function simultaneously. With the asymmetrical architecture, its enable the operating wavelength on two different optical trunks to be switched to each other and implementing accumulating function simultaneously. Here, the operating wavelengths can be reused again as a carrier of new data stream. The wavelength transfer between two different cores of fiber will increase the flexibility, survivability, and also efficiency of the network structure. To make device operational more efficient, micro-electromechanical system (MEMS) switches are used to control the mechanism of operation such as wavelength add/drop and wavelength routing operation. As a result, the switching performed within the optical layer will be able to achieve high-speed restoration against failure/degradation of cables, fibers and optical amplifiers.
\n\t\t\tThe OXADM architecture consists of 3 parts; selective port, add/drop operation, and path routing. Selective port permits only the interest wavelength going through and acts as filter. With the switch configuration, add and drop function can be activated in second part of OXADM architecture. The ‘accumulation’ feature is found in the third part. The functions of OXADM include node termination, drop and add, routing, multiplexing, and also providing mechanism of restoration for point-to-point (P2P), ring, and mesh metropolitan as well as fiber-to-the-home (FTTH) access network.
\n\t\t\tThe OXADM also provide survivability through restoration against failure by means of dedicated and shared protection that can be applied in wavelength division multiplexing (WDM) ring metropolitan network. In other application, OXADM can also work as any single device such as multiplexer, demultiplexer, OXC, OADM, wavelength selective coupler (WSC), and wavelength roundabout (WRB). With such the excellent features, the OXADM is expected to be unique, universal, and with a high reliability that is used to overcome the various functions in WDM communication network today.
\n\t\t\tThe experimental results showed the value of crosstalk and return loss for OXADM is bigger than 60 dB and 40 dB respectively. The results also showed the value of insertion loss was less than 0.06 dB under ideal condition, the maximum length that can be achieved is 94 km. In the transmission using SMF-28 fiber, with the transmitter power of 0 dBm and sensitivity –22.8 dBm at a P2P configuration with safety margin, the required transmission is 71 km with OXADM. The optical signal-noise-ratio (OSNR) measurements for every function of OXADM are also proposed with the values are bigger than 20 dB.
\n\t\tOptical networks are high-capacity telecommunications networks based on optical technologies and components that provide routing, grooming, and restoration at the wavelength level as well as wavelength-based services. As networks face increasing bandwidth demand and diminishing fiber availability, network providers are moving towards a crucial milestone in network evolution: the optical network. Optical networks based on the emergence of the optical layer in transport networks, provide higher capacity and reduced costs for new applications such as the Internet, video and multimedia interaction, and advanced digital services (IEC, 2007).
\n\t\t\tThe explosive growth of data, particularly internet traffic, has led to a dramatic increase in demand for transmission bandwidth imposing an immediate requirement for broadband transport networks. Currently telecommunications networks widely employ WDM in single-mode (SM) optical fibers to interconnect discrete network locations and offer high capacity, high-speed and long reach transmission capabilities. The information transmitted in the optical domain is transferred through simple P2P links terminated by Synchronous Digital Hierarchy (SDH) or Synchronous Optical Network (SONET) equipment forming ring and mesh network topologies. This solution requires a number of intermediate service layers introducing complex network architectures. Such a scenario provides unnecessarily high switching granularity, numerous optoelectronic conversions and complicated network management resulting in poor scalability for data services and slow service turn up with high installation, operation and maintenance cost. With the recent technology evolution in the area of optical communications, the WDM transport layer is migrating from simple transmission links into elaborate networks providing similar functionality to that of the SDH/SONET layer, with improved features, higher manageability, lower complexity, and cost-effective. Integrated WDM networks performing switching (Ramaswami, 2001) and routing are deployed in order to overcome the need for multi-layer network architectures (Tzanakaki et al., 2002). In such network scenarios, high capacity optical routes are set in the transport layer forming connections between discrete points of the network topology. In wavelength routed networks switching is performed through OADM and OXC nodes.
\n\t\t\tOADM is element that provides capability to add and drop traffic in optical network. The function of an OADM is to insert (add) or extract (drop) one or more selected wavelengths at a designated point in an optical network (Keiser, 2003). An OADM can be passive or active device that located at sites supporting one or two (bi-directional) fiber pairs and enable a number of wavelength channels to be dropped and added reducing the number of unnecessary optoelectronic conversions, without affecting the traffic that is transmitted transparently through the node (Mukherjee, 2006).
\n\t\t\t\tThe features that an OADM should ideally support are listed below:
\n\t\t\t\tDrop capability of any channel and insertion capability o f a channel on any unused wavelength
Dynamic reconfiguration supporting fast switching speed (- ms)
Variable add/drop percentage up to 100%
Scalable architecture in a modular fashion
Drop and continue functionality enabling network architectures such as dual homing rings
Span and ring protection capabilities
Minimum performance degradation in terms of noise, crosstalk, filtering, etc for add, drop, and through paths
The OADM enhances the WDM terminals by adding several significant features (see Figure 1). The OADM systems have the capacity of up to 40 optical wavelengths. They efficiently drop and add various wavelengths at intermediate sites along the network for solving a significant challenge for existing WDM (IEC, 2007).
\n\t\t\t\tOADM functionality (IEC, 2007).
Most important, OADM technology introduces asynchronous transponders to allow the optical-network element to interface directly to high revenue generating services. It is now possible for asynchronous transfer mode (ATM), frame relay (FR), native local area networks (LANs), high-bandwidth Internet protocol (IP), and others to connect directly to the network via a wavelength in the optical layer. Transponder technology also extends the life of older lightwave systems by accepting its bandwidth directly into the optical layer, converting its frequency to an acceptable standard, and providing protection, and restoration. The OADM also is the foundation of optical bidirectional line switched rings (OBLSRs), which are described in the next module (IEC, 2007).
\n\t\t\t\tAn OADM can be used in both linear and ring network architectures and in practice operate in either fixed or reconfigurable mode. In fixed OADMs the add/drop and express (through) channels are predetermined and can only be manually rearranged after installation. In reconfigurable OADMs the channels that are added/dropped or pass transparently through the node can be dynamically reconfigured as required by the network. These are more complicated structures but more flexible as they provide provisioning on demand without manual intervention, therefore they can be set up on the fly to allow adding or dropping of a percentage of the overall traffic. The reduction of unnecessary optoelectronic conversions through the use of OADMs introduces significant cost savings in the network (Tzanakaki et al., 2003).
\n\t\t\t\tAn OADM allows the insertion or extraction of a wavelength from a fiber at a point between terminals. An OADM can operate either statically or dynamically. Some vendors call a dynamic device a reconfigurable OADM (R-OADM). A static version obviously is not as flexible and may require a hardware change if a different wavelength needs to be dropped or added. For example, a static OADM might use two optical circulators in conjunction with a series of fixed-wavelength fiber Bragg gratings (FBG). A dynamic or R-OADM results if the gratings are tunable. Although a dynamic feature adds greater flexibility to a network, this versatility also requires more careful system design. In particular, tunable (wavelength-selectable) optical filters may be needed at the drop receivers, and the OSNR for each wavelength must be analyzed more exactly (Keiser, 2003).
\n\t\t\t\tThe technology of choice is determined by the functional and the performance requirements of the node. R-OADM can be divided into two categories partly and fully reconfigurable. In partly reconfigurable architectures there is capability to select the channels to be added/dropped, but there is a predetermined connectivity matrix between add/drop and through ports restricting the wavelength assignment function. Fully reconfigurable OADMs also provide the ability to select the channels to be added/dropped, but also offer flexible connectivity between add/drop and through ports, which enables flexible wavelength assignment with the use of tunable transmitters and receivers (Tzanakaki et al., 2003).
\n\t\t\t\tR-OADM can be divided into two main generations. The first is mainly applied in linear network configurations and does not support optical path protection while the second is applied in ring configurations and provide optical layer protection to support network survivability. The two most common examples of fully R-OADM: Wavelength selective (WC) and broadcast select (BS) architectures are illustrated in Figure 2b & 2c. The WS architecture utilizes wavelength (de)multiplexing and a switch fabric interconnecting all express and add/drop ports; while the BS is based on passive splitters/couplers and tunable filters (Mukherjee, 2006).
\n\t\t\t\tThe tunable filtering, present in the through path, should provide selective blocking of any dropped channels and can be achieved using technologies such as or acousto-optic filters or dynamic channel equalizers (DCEs) based on diffraction grating and liquid crystal or MEMS technologies (Tzanakaki et al., 2003). The overall loss introduced by the through path of the BS solution is noticeably lower than the loss of the WS approach, significantly improving the OSNR of the node and therefore its concatenation performance in a practical transmission link or ring network. In addition, the BS design offers superior filter concatenation performance, advanced features such as drop and continue, and good scalability in terms off add/drop percentage (Mukherjee, 2006).
\n\t\t\t\ta) Generic OADM architecture, (b) WS OADM architecture, and (c) BS OADM architecture.
\n\t\t\t\t\tFigure 3 showed a simple OADM configuration that has four input and four output ports. Here the add and drop functions are controlled by MEMS-based miniature mirrors that are activated selectively to connect the desired fiber paths. When no mirrors are activated, each incoming channel passes through the switch to the output port. Incoming signals can be dropped from the traffic flow by activating the appropriate mirror pair. For example, to have the signal carried on wavelength
Depending on whether an engineer is designing a metropolitan area network (MAN) or a long-haul network, different performance specifications need to be addressed when implementing an OADM capability in the network. In general, because of the nature of the services provided, changes in the add/drop configuration for a long-haul network tend to occur less frequently than in a MAN. In addition, the channel spacing is much narrower in a long-haul network, and the optical amplifiers which are used must cover a wider spectral band. For an interesting analysis of the Erbium Doped Fiber Amplifier (EDFA) performance requirements and the link power budgets used for an OADM capability in a MAN environment (Keiser, 2003).
\n\t\t\t\tWideband long-haul networks are essentially a collection of P2P trunk lines with one or more OADMs for inserting and extracting traffic at intermediate points. Figure 4 depicted a generic long-haul Dense WDM (DWDM) network. Such networks typically are configured as large rings in order to offer reliability and survivability features. For example, if there is cable cut somewhere, the traffic that was supposed to pass through that fault can be routed in the opposite direction on the ring and still reach its intended destination. As shown in Figure 4 are three 10 Gbps DWDM rings and the major switching centers where wavelengths can be regenerated, routed, added, or dropped. The links between DWDM nodes have optical amplifiers every 80 km to boost the optical signal amplitude and regenerators every 600 km to overcome degradation in the quality of the optical signals. Extended-reach long-haul networks allow path lengths without regenerators of several thousand kilometers. Also illustrated are typical services between two end-users, such as SONET/SDH, Gigabit Ethernet, or IP traffic (Keiser, 2003).
\n\t\t\t\tExample of adding and dropping wavelengths with a 4x4 OADM device that uses miniature switching mirrors.
A generic long-haul DWDM network which is configured as a set of large rings.
OXC switches optical signals from input ports to output ports. These type of elements are usually considered to be wavelength insensitive, i.e., incapable of demultiplexing different wavelength signals on a given input fiber. OXC is located at nodes cross-connecting a number of fiber pairs and also support add and drop of local traffic providing the interface with the service layer. A basic cross-connect element is the 2x2 cross point element. A 2x2 cross point element routes optical signals from two input ports to two output ports and has two states: cross states and bar states (see Figure 5). In the cross state, the signal from the upper input port is routed to the lower output port, and the signal from the lower input port is routed to the upper output port. In the bar state, the signal from the upper input port is routed to the upper output port, and the signal from the lower input port is routed to the lower output port (Mukherjee, 2006).
\n\t\t\t\tTo support flexible path provisioning and network resilience, OXCs normally utilize a switch fabric to enable routing of any incoming channels to the appropriate output ports and access to the local client traffic. The features that an OXC should ideally support are similar to these of an OADM, but additionally OXCs need to provide:
\n\t\t\t\tStrictly non-blocking connectivity between input and output ports
Span and ring protection as well as mesh restoration capabilities
Efficient use of fiber facilities at the optical level obviously becomes critical as service providers begin to move wavelengths around the world. Routing and grooming are key areas that must be addressed. This is the function of the OXC, as shown in Figure 6.
\n\t\t\t\tOXC state.
OXC block diagram (IEC, 2007).
In the optical domain, where 40 optical channels can be transported on a single fiber, a network element is needed that can accept various wavelengths on input ports and route them to appropriate output ports in the network. To accomplish this, the OXC needs three building blocks as illustrated in Figure 7:
\n\t\t\t\t1. Fiber switching - the ability to route all of the wavelengths on an incoming fiber to a different outgoing fiber
2. Wavelength switching - the ability to switch specific wavelengths from an incoming fiber to multiple outgoing fibers
3. Wavelength conversion - the ability to take incoming wavelengths and convert them (on the fly) to another optical frequency on the outgoing port; this is necessary to achieve strictly non-blocking architectures when using wavelength switching (IEC, 2007).
Switching and conversion with OXC (IEC, 2007).
OXADMs are elements which provide the capabilities of add and drop function and cross connecting traffic in the network, similar to OADM and OXC (Caraglia, 2003; Mutafungwa, 2000; Tsushima, 1998; Tzanakaki, 2003). OXADM consists of three main subsystem; a wavelength selective demultiplexer, a switching subsystem, and a wavelength multiplexer. Each OXADM is expected to handle at least two distinct wavelength channels each with a coarse granularity of 2.5 Gbps of higher (signals with finer granularities are handled by logical switch node such as SDH/SONET digital cross connects or ATM switches. There are eight ports for add and drop functions, which are controlled by four lines of MEMs-optical switch. The other four lines of MEMs switches are used to control the wavelength routing function between two different paths (see Figure 8). The functions of OXADM include node termination, drop and add, routing, multiplexing and also providing mechanism of restoration for P2P, point-to-multipoint (P2MP), ring, and mesh metropolitan. With the setting of the MEMs optical switch configuration, the device can be programmed to function as another optical device such as multiplexer, demultiplexer, coupler, wavelength converter (with fiber grating filter configuration), OADM, WRB, and etc for the single application.
\n\t\t\tThe block diagram of OXADM architecture.
The classification of OXADM.
The designed 4-channels OXADM device is expected to have maximum operational loss of 0.06 dB for each channel when device components are in ideal condition. The maximum insertion loss when considering the component loss at every channel is less than 6 dB. In the transmission using SMF-28 fiber, with the transmitter power of 0 dBm and sensitivity –22.8 dBm at a point-to-point configuration with safety margin, the required transmission is 71 km with OXADM without regeneration (Rahman et al., 2006).
\n\t\t\t\tThe OXADM architecture consists of 3 parts; selective port, add/drop operation, and path routing. Selective port permits only the interest wavelength going through and acts as filter. With the switch configuration, add and drop function can be activated in second part of OXADM architecture. The signals are then re-routing to any port of output. The signals can also be accumulated on one path and exit at any output port. The partition of OXADM architecture is depicted in Figure 9.
\n\t\t\tThe control switch for OXADM optical switch is used to change the path of incoming from the input port. When the control switches in ‘off’ state, no switching occurs and the signal pass through the device as seen from the Figure 10a. But when the control switch B is ‘on’ state, the signal from the Input 1 will be switch to Output 2 (see Figure 10b). In contrast to the control switch B is in reverse state, the accumulation function occurs which multiplex all the signals from the inputs together and exit at the Output 2. This will be the same if the control switch A is in ‘on’ state but the output is at Output 1. If both switches are in ‘on’ state, the signal will be switched to exchange their output port and works as an OXC device. The functional of an OXADM optical switch can be summarized through the truth functional table shown by Table 1. The incoming signals from the back will be switched to neighbor output port or pass through the device. This is shown in Figure 11.
\n\t\t\t\tOXADM optical switch works as re-configurable output port multiplexer.
OXADM optical switch works as 2x2 demultiplexer. When the switch is activated,
the signal will be switched to any output port.
\n\t\t\t\tSwitch A | \n\t\t\t\t\t\t\tSwitch B | \n\t\t\t\t\t\t\tOutput 1 | \n\t\t\t\t\t\t\tOutput 2 | \n\t\t\t\t\t\t||
0 | \n\t\t\t\t\t\t\t0 | \n\t\t\t\t\t\t\tλ A\n\t\t\t\t\t\t\t | \n\t\t\t\t\t\t\tλ B\n\t\t\t\t\t\t\t | \n\t\t\t\t\t\t||
1 | \n\t\t\t\t\t\t\t0 | \n\t\t\t\t\t\t\tλ A + λ B\n\t\t\t\t\t\t\t | \n\t\t\t\t\t\t\tX | \n\t\t\t\t\t\t||
0 | \n\t\t\t\t\t\t\t1 | \n\t\t\t\t\t\t\tX | \n\t\t\t\t\t\t\tλ A + λ B\n\t\t\t\t\t\t\t | \n\t\t\t\t\t\t||
0=Off | \n\t\t\t\t\t\t\tλ A =Signal enters input 1 | \n\t\t\t\t\t\t\t\n\t\t\t\t\t\t | |||
1=On | \n\t\t\t\t\t\t\tλ B =Signal enters input 2 | \n\t\t\t\t\t\t\t\n\t\t\t\t\t\t | |||
\n\t\t\t\t\t\t\t | X=No signal | \n\t\t\t\t\t\t\t\n\t\t\t\t\t\t |
The truth table of OXADM optical switch.
OXADM can also work as any single device such as multiplexer, demultiplexer, OXC, OADM, WSC, and WRB.
\n\t\t\t\t1. Demultiplexer - There are two configuration of demultiplexer using OXADM, with interleaver and without interleaver. The function of interleaver is to separate the incoming signal before entering the OXADM ports (Figure 12ai). In contrast, the signal will enter the back port and has automatically routed to their respective path (Figure 12aii).
2. Multiplexer - The input signals enter the add ports of OXADM and the multiplexed signal out of the signal via output port (Figure 12b).
3. OADM - The separated wavelengths out of the interleaver have a capability to add/drop function before they are combined and exit one of the output ports of OXADM (Figure 12c).
4. WSC - Two WSC devices will be produced by OXADM. The signal will enter the input port and will be separated out through the drop port of OXADM (Figure 12d).
5. OXC - The concept is similar to OADM but the OXADM also offer the function of cross-connect the signals. The function is almost the same with OXC device (Figure 12e).
6. WRB - The new invented device that offer the management function of wavelengths. Different with circulator in which the inputs and outputs are built separately (Figure 12f).
FTTH is a simple, inexpensive, ideal, and attractive many parties in optical communication today. A number of factors are increasing the interest among network service providers in offering the triple play services of high-speed data access, voice, and video. Most importantly, subscribers are finding a growing number of applications that drive their desire for higher bandwidth, including Internet access, interactive games, and video delivery. Since the fiber offers a vast amount of bandwidth that can be utilized for communication, one of utilizing this is signal multiplexing. Due to the large bandwidth and the associated high bit rates, the multiplexing process is beyond the capabilities of pure electronic methods and has to be implemented optically as well. As the reach of fiber is being extended to the access network it is economically attractive to share fibers between different end-users without adding active components in the network (Menif and Fathallah, 2007).
\n\t\t\t\tOXADM multifunctional switch.
It involves the full installment of fiber from central office (CO) till to customer houses which is called premises. Recently, installation of FTTH technology has started to accelerate as a strong alternative to the existing broadband access technologies based on copper pairs (Digital Subscriber Line, DSL) and coax (cable modems). This worldwide acceleration is largely due to both the considerable decrease in capital expenses (CAPEX) of introducing FTTH connectivity and its “future proof” nature in providing ever increasing user bandwidth requirements (Yuksel et al., 2008). This technology ensures low operational expenditures (OPEX) due to all elements in used are the passive optical device with small number used. The maximum distance achievable is 20 km with gigabit of transmission rate. FTTH consists of 3 significant elements: optical line terminal (OLT), optical splitter, and optical network unit (ONU). The designed OXADM is can also used as the wavelength management in OLT architecture for excellently FTTH. It has 4 inputs terminal which represent the 4 different signal carriers to be multiplexed and exit at Output 1. Three wavelengths are used typically 1310 nm for data/voice upstream transmission and 1490 nm for the downstream data/voice transmission. Meanwhile 1550 nm is used to transmit downstream video signal.
\n\t\t\t\tSince the possible wavelength for communication is 1200-1600 nm, 1625-1650 nm wavelength regions is commonly considered for in-service monitoring purpose without affecting the services to other end-users. Additional wavelength 1625 nm will be adding up to the system to carries the troubleshooting signal for line status monitoring purposes. In the downstream direction (OLT to users), packets are broadcast by the OLT and extracted by their destination ONUs based on their media access control (MAC) address. In the upstream direction (users to OLT), each ONU will use a time shared channel (TDM) arbitrated by the OLT. OLT is function to aggregates Ethernet traffic from remote ONU devices through passive optical splitters. The signals then are sent to the customer premises. This can be defined in Figure 13 with the wavelength allocation highlighted.
\n\t\t\t\tOXADM function as the wavelength management element in OLT in FTTH.
The OXADM device will be compared with two existing switching devices; directional coupler (DC) switch and OXC. The non-selective DC switch has two states and one control element. It has fixed number of input and output port that is two. The wide bandwidth signal comes from the input port with switch to either one of output ports. It works bi-directional with symmetrical function (Palais, 2005). Figure 14 showed the mechanism of switching for directional coupler switch in normal (a) and active condition (b) & (c). The application of DC switch is to control the signal path in WDM network and optical storage; and can also perform the function of OADM in optical distributed network
\n\t\t\t\tOXC is the directional coupler witch but with many ports. The functional of OXC is cross-connecting between output and input port (see Figure 15) (Mutafungwa, 2001). Same with OXADM, the OXC is selective device but it does not have ‘accumulation’ feature. In contrast with OXADM, OXC works bi-directional with symmetrical function. The application of OXC is as a switching device in mesh network configuration and also in optical storage. Table 2 summarized the differences of OXADM as compared with DC and OXC.
\n\t\t\t\tFeatures | \n\t\t\t\t\t\t\tOXADM | \n\t\t\t\t\t\t\tDC | \n\t\t\t\t\t\t\tOXC | \n\t\t\t\t\t\t
Selective | \n\t\t\t\t\t\t\tYes | \n\t\t\t\t\t\t\tNo | \n\t\t\t\t\t\t\tYes | \n\t\t\t\t\t\t
Accumulation | \n\t\t\t\t\t\t\tYes | \n\t\t\t\t\t\t\tNo | \n\t\t\t\t\t\t\tNo | \n\t\t\t\t\t\t
Scalability | \n\t\t\t\t\t\t\tYes | \n\t\t\t\t\t\t\tNo | \n\t\t\t\t\t\t\tYes | \n\t\t\t\t\t\t
Symmetrical | \n\t\t\t\t\t\t\tNo | \n\t\t\t\t\t\t\tYes | \n\t\t\t\t\t\t\tYes | \n\t\t\t\t\t\t
function | \n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t | \n\t\t\t\t\t\t\t | \n\t\t\t\t\t\t |
Comparison between OXADM, DC, and OXC.
Switching mechanism of DC optical, switch, a) normal (b) activate.
Switching mechanism of OXC a) normal (b) activate.
Two parameters have been studied experimentally to ensure the interference of uninterested signal is minimized. Figure 16 presented the experimental set up to measure the crosstalk at two ports of OXADM and the results have been redrawn in Figure 17 and 18 respectively. The crosstalk value is bigger than 60 dB means the interested wavelength is in safety level and the transmitted data can be interpreted at any receiver end.
\n\t\t\t\tCrosstalk measurement set up
Redrawing of measured output port at every port for configuration 1.
Redrawing of measured output port at every port for configuration 2.
The other parameter should be considered for bi-directional device is return loss. Return loss is the disturbance of uninterested signal against the direction of interested signal. This can be explained using Figure 19. The return loss is measured by using set up in Figure 20 and the result is shown in Figure 21. The return signal coming out from the input port is routing to OSA 3 using optical circulator. The value is 40 dB which is higher than minimum safety value. Both experimental have shown that the OXADM optical switch has a good and acceptable value of crosstalk and return loss.
\n\t\t\t\tReturn loss or leak reflected signal which contributes to crosstalk phenomena in bi-directional device.
Return loss measurement set up.
Redrawing of measured output port at every port for configuration 2 for return loss measurement.
The OXADM device is characterized by using two tunable light sources and two optical spectrum analyzers. The designed 4-channel OXADM device is expected to have maximum operational loss of 0.6 dB for each channel when device components are in ideal condition. The maximum insertion loss when considering the component loss at every channel is 6 dB.
\n\t\t\t\tThe testing is carried out for every single function of OXADM. The function includes bypass, path exchange and accumulation. The single operating wavelength test (wavelength is 1510 nm), the results show the OSNR value for bypass function is 20 dB and path exchange is also 20 dB. Each measurement result is indicated in Figure 22 till 24.
\n\t\t\t\tThe decrement of kilometers occurs by increasing the attenuation of OXADM which represent the device losses.
The measured output power at two operating wavelength for bypass operation.
The measured output power for path exchange operation.
The path splitting function (accumulation function in reverse mode as Figure 10b and 10c) is also applied and the result shown in Figure 25 with OSNR > 24 dB. For backward operation as depicted in Figure 26, the OSNR values for cross-connecting function (as Figure 11) are bigger than 22 dB. This can be defined that the level of signal is 20 dB higher than noise level for all single functions of OXADM optical switch. The 20 dB reference indicates the acceptable value for the signal to noise ratio in data communication.
\n\t\t\t\tThe measured output power two operating wavelength for path splitting operation (accumulation function in reverse mode).
The measured output power at two operating wavelengths for path exchange operation.
A prototype was designed and developed to enable us to evaluate the performance in an actual propagation environment as illustrated in Figure 27 and 28.
\n\t\t\tPhotographic view of OXADM device set up.
Photographic view of two OXADM device prototypes set up in P2P network.
A new switching device which utilizes the combined concepts of OADM and OXC operation is presented through the development of OXADM. The experimental results show the value of crosstalk and return loss is bigger than 60 dB and 40 dB respectively. In our previous results have also shown the value of insertion loss was less than 0.06 dB under ideal condition, the maximum length that can be achieved is 94 km. While when considering the loss, with the transmitter power of 0 dBm and sensitivity –22.8 dBm at a P2P configuration with safety margin, the required transmission is 71 km with OXADM. The OXADM switching mechanism has been explained and compare with other existing optical switch; DC optical switch and OXC. The OXADM optical device is particularly designed for WDM metro application. It can be used as restoration switch in FTTH network. OXADM can also work as any single device such as demultiplexer, multiplexer, OADM, OXC, WSC, and WRB. In other application, the OXADM can also provide survivability through restoration against failure by means of dedicated and shared protection that can be applied in WDM ring metropolitan network.
\n\t\tThis project is supported by Ministry of Science, Technology and Innovation (MOSTI), Government of Malaysia, through the National Top-Down Project fund and National Science Fund (NSF). The authors would like to thank the Photonic Technology Laboratory in Institute of Micro Engineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia (UKM), Malaysia, for providing the facilities to conduct the experiments. The OXADM had firstly been exhibited in 19th International Invention, Innovation and Technology Exhibition (ITEX 2008), Malaysia, and was awarded with Bronze medal in telecommunication category.
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\n\nIntechOpen works with award winning print-houses and we hold to the fact that all of our printed products are of the highest quality.
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His studies in robotics lead him not only to a PhD degree but also inspired him to co-found and build the International Journal of Advanced Robotic Systems - world's first Open Access journal in the field of robotics.",institutionString:null,institution:{name:"TU Wien",country:{name:"Austria"}}},{id:"441",title:"Ph.D.",name:"Jaekyu",middleName:null,surname:"Park",slug:"jaekyu-park",fullName:"Jaekyu Park",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/441/images/1881_n.jpg",biography:null,institutionString:null,institution:{name:"LG Corporation (South Korea)",country:{name:"Korea, South"}}},{id:"465",title:"Dr",name:"Christian",middleName:null,surname:"Martens",slug:"christian-martens",fullName:"Christian Martens",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:null},{id:"479",title:"Dr.",name:"Valentina",middleName:null,surname:"Colla",slug:"valentina-colla",fullName:"Valentina Colla",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/479/images/358_n.jpg",biography:null,institutionString:null,institution:{name:"Sant'Anna School of Advanced Studies",country:{name:"Italy"}}},{id:"494",title:"PhD",name:"Loris",middleName:null,surname:"Nanni",slug:"loris-nanni",fullName:"Loris Nanni",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/494/images/system/494.jpg",biography:"Loris Nanni received his Master Degree cum laude on June-2002 from the University of Bologna, and the April 26th 2006 he received his Ph.D. in Computer Engineering at DEIS, University of Bologna. 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Lignocellulosic residues are mixed and burnt with coal to generate electricity. Presently, crude oil is replaced by bioethanol and biodiesel produced from biomass substrate. Some special class of chemicals can be derived from biomass that can subsequently replace the usage of non‐renewable resources of oil and coal. Pyrolysis of woody biomass to obtain pyroliginous acid was started hundreds of years ago, which has versatile applications. The range of products that can be derived from biomass is huge, prompting extent of research using different types of thermal conversion technologies, including pyrolysis, gasification, torrefaction, anaerobic digestion and hydrothermal processing. This chapter provides insights about the stages of reaction during pyrolysis and the outcome of reaction conditions on the products. Technical development and adjustment of process condition can offer a suitable environmentally benign scheme to increase the energy density of the lignocellulosic residues.",book:{id:"5758",slug:"pyrolysis",title:"Pyrolysis",fullTitle:"Pyrolysis"},signatures:"Chowdhury Zaira Zaman, Kaushik Pal, Wageeh A. Yehye, Suresh\nSagadevan, Syed Tawab Shah, Ganiyu Abimbola Adebisi, Emy\nMarliana, Rahman Faijur Rafique and Rafie Bin Johan",authors:[{id:"198251",title:"Dr.",name:"Zaira",middleName:null,surname:"Chowdhury",slug:"zaira-chowdhury",fullName:"Zaira Chowdhury"},{id:"208451",title:"Associate Prof.",name:"Kaushik",middleName:null,surname:"Pal",slug:"kaushik-pal",fullName:"Kaushik Pal"}]}],mostDownloadedChaptersLast30Days:[{id:"56034",title:"Pyrolysis: A Sustainable Way to Generate Energy from Waste",slug:"pyrolysis-a-sustainable-way-to-generate-energy-from-waste",totalDownloads:8214,totalCrossrefCites:49,totalDimensionsCites:76,abstract:"Lignocellulosic biomass is a potentially more valuable renewable resource that can be utilized effusively as a chief source of heat for cooking and can correspondingly subsidize the production of electricity, heat, biofuels and chemicals including solid fuel like char or carbon. Lignocellulosic residues are mixed and burnt with coal to generate electricity. Presently, crude oil is replaced by bioethanol and biodiesel produced from biomass substrate. Some special class of chemicals can be derived from biomass that can subsequently replace the usage of non‐renewable resources of oil and coal. Pyrolysis of woody biomass to obtain pyroliginous acid was started hundreds of years ago, which has versatile applications. The range of products that can be derived from biomass is huge, prompting extent of research using different types of thermal conversion technologies, including pyrolysis, gasification, torrefaction, anaerobic digestion and hydrothermal processing. This chapter provides insights about the stages of reaction during pyrolysis and the outcome of reaction conditions on the products. Technical development and adjustment of process condition can offer a suitable environmentally benign scheme to increase the energy density of the lignocellulosic residues.",book:{id:"5758",slug:"pyrolysis",title:"Pyrolysis",fullTitle:"Pyrolysis"},signatures:"Chowdhury Zaira Zaman, Kaushik Pal, Wageeh A. Yehye, Suresh\nSagadevan, Syed Tawab Shah, Ganiyu Abimbola Adebisi, Emy\nMarliana, Rahman Faijur Rafique and Rafie Bin Johan",authors:[{id:"198251",title:"Dr.",name:"Zaira",middleName:null,surname:"Chowdhury",slug:"zaira-chowdhury",fullName:"Zaira Chowdhury"},{id:"208451",title:"Associate Prof.",name:"Kaushik",middleName:null,surname:"Pal",slug:"kaushik-pal",fullName:"Kaushik Pal"}]},{id:"44033",title:"Ion-Exchange Chromatography and Its Applications",slug:"ion-exchange-chromatography-and-its-applications",totalDownloads:29853,totalCrossrefCites:7,totalDimensionsCites:27,abstract:null,book:{id:"3487",slug:"column-chromatography",title:"Column Chromatography",fullTitle:"Column Chromatography"},signatures:"Özlem Bahadir Acikara",authors:[{id:"109364",title:"Dr.",name:"Özlem",middleName:null,surname:"Bahadır Acıkara",slug:"ozlem-bahadir-acikara",fullName:"Özlem Bahadır Acıkara"}]},{id:"52155",title:"EOR Processes, Opportunities and Technological Advancements",slug:"eor-processes-opportunities-and-technological-advancements",totalDownloads:5499,totalCrossrefCites:17,totalDimensionsCites:36,abstract:"Enhanced oil recovery (EOR) processes are well known for their efficiency in incrementing oil production; however, the selection of the most suitable method to adopt for specific field applications is challenging. Hence, this chapter presents an overview of different EOR techniques currently applied in oil fields, the opportunities associated with these techniques, key technological advancements to guide the decision‐making process for optimum applicability and productivity and a brief review of field applications.",book:{id:"5143",slug:"chemical-enhanced-oil-recovery-ceor-a-practical-overview",title:"Chemical Enhanced Oil Recovery (cEOR)",fullTitle:"Chemical Enhanced Oil Recovery (cEOR) - a Practical Overview"},signatures:"Lezorgia Nekabari Nwidee, Stephen Theophilus, Ahmed Barifcani,\nMohammad Sarmadivaleh and Stefan Iglauer",authors:[{id:"37799",title:"Dr.",name:"Stefan",middleName:null,surname:"Iglauer",slug:"stefan-iglauer",fullName:"Stefan Iglauer"},{id:"179076",title:"Dr.",name:"Lezorgia",middleName:"Nekabari",surname:"Nwidee",slug:"lezorgia-nwidee",fullName:"Lezorgia Nwidee"},{id:"179077",title:"Prof.",name:"Ahmed",middleName:null,surname:"Barifcani",slug:"ahmed-barifcani",fullName:"Ahmed Barifcani"},{id:"179078",title:"Prof.",name:"Stephen",middleName:null,surname:"Theophilus",slug:"stephen-theophilus",fullName:"Stephen Theophilus"},{id:"189371",title:"Dr.",name:"Mohammad",middleName:null,surname:"Sarmadivaleh",slug:"mohammad-sarmadivaleh",fullName:"Mohammad Sarmadivaleh"}]},{id:"57510",title:"Solvents for Carbon Dioxide Capture",slug:"solvents-for-carbon-dioxide-capture",totalDownloads:4051,totalCrossrefCites:15,totalDimensionsCites:39,abstract:"Anthropogenic CO2 emissions are considered the major contributor of greenhouse gas emissions worldwide. The mitigation of this kind of CO2 emissions relies on a portfolio of alternatives where CO2 absorption appears as the nearest approach to be applied at industrial scale. Researchers have been focused on developing new formulations of solvents to make more competitive CO2 absorption as a carbon capture and storage (CCS) technology. In this sense, this chapter summarizes both the conventional solvents and the most recent investigations on this field. Chemical absorption is more suitable for a lot of industrial process due to the flue gas conditions: ambient pressure, low CO2 concentration and large volume. Therefore numerous novel solvents came up in recent years and they are further discussed in this chapter. The most recent solvents, their mechanisms and kinetics and the advantages and disadvantages are also included. Finally, physical solvents are adequate in high CO2 partial pressure applications and they are reported in the last section. Although physical absorption field is constrained to high-pressure flue gas, physical solvents provided higher performance in CO2 separation process and their characteristics are also summarized.",book:{id:"6186",slug:"carbon-dioxide-chemistry-capture-and-oil-recovery",title:"Carbon Dioxide Chemistry, Capture and Oil Recovery",fullTitle:"Carbon Dioxide Chemistry, Capture and Oil Recovery"},signatures:"Fernando Vega, Mercedes Cano, Sara Camino, Luz M. Gallego\nFernández, Esmeralda Portillo and Benito Navarrete",authors:[{id:"10704",title:"Prof.",name:"Benito",middleName:null,surname:"Navarrete",slug:"benito-navarrete",fullName:"Benito Navarrete"},{id:"209759",title:"Dr.",name:"Fernando",middleName:null,surname:"Vega",slug:"fernando-vega",fullName:"Fernando Vega"},{id:"218843",title:"Dr.",name:"Mercedes",middleName:null,surname:"Cano",slug:"mercedes-cano",fullName:"Mercedes Cano"},{id:"218844",title:"Mrs.",name:"Sara",middleName:null,surname:"Camino",slug:"sara-camino",fullName:"Sara Camino"},{id:"218845",title:"Mrs.",name:"Luz. M.",middleName:null,surname:"Gallego Fernández",slug:"luz.-m.-gallego-fernandez",fullName:"Luz. M. Gallego Fernández"},{id:"218846",title:"Mrs.",name:"Esmeralda",middleName:null,surname:"Portillo",slug:"esmeralda-portillo",fullName:"Esmeralda Portillo"}]},{id:"13241",title:"Heat Flow, Work Energy, Chemical Reactions, and Thermodynamics: a Dynamical Systems Perspective",slug:"heat-flow-work-energy-chemical-reactions-and-thermodynamics-a-dynamical-systems-perspective",totalDownloads:3246,totalCrossrefCites:0,totalDimensionsCites:2,abstract:null,book:{id:"25",slug:"thermodynamics",title:"Thermodynamics",fullTitle:"Thermodynamics"},signatures:"Wassim M. Haddad, Sergey G. Nersesov and VijaySekhar Chellaboina",authors:[{id:"15784",title:"Dr.",name:"Wassim",middleName:"M.",surname:"Haddad",slug:"wassim-haddad",fullName:"Wassim Haddad"},{id:"15788",title:"Prof.",name:"Sergey",middleName:"G.",surname:"Nersesov",slug:"sergey-nersesov",fullName:"Sergey Nersesov"},{id:"15789",title:"Prof.",name:"Vijay Sekhar",middleName:null,surname:"Chellaboina",slug:"vijay-sekhar-chellaboina",fullName:"Vijay Sekhar Chellaboina"}]}],onlineFirstChaptersFilter:{topicId:"113",limit:6,offset:0},onlineFirstChaptersCollection:[],onlineFirstChaptersTotal:0},preDownload:{success:null,errors:{}},subscriptionForm:{success:null,errors:{}},aboutIntechopen:{},privacyPolicy:{},peerReviewing:{},howOpenAccessPublishingWithIntechopenWorks:{},sponsorshipBooks:{sponsorshipBooks:[],offset:8,limit:8,total:0},allSeries:{pteSeriesList:[{id:"14",title:"Artificial Intelligence",numberOfPublishedBooks:9,numberOfPublishedChapters:90,numberOfOpenTopics:6,numberOfUpcomingTopics:0,issn:"2633-1403",doi:"10.5772/intechopen.79920",isOpenForSubmission:!0},{id:"7",title:"Biomedical Engineering",numberOfPublishedBooks:12,numberOfPublishedChapters:104,numberOfOpenTopics:3,numberOfUpcomingTopics:0,issn:"2631-5343",doi:"10.5772/intechopen.71985",isOpenForSubmission:!0}],lsSeriesList:[{id:"11",title:"Biochemistry",numberOfPublishedBooks:32,numberOfPublishedChapters:319,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2632-0983",doi:"10.5772/intechopen.72877",isOpenForSubmission:!0},{id:"25",title:"Environmental Sciences",numberOfPublishedBooks:1,numberOfPublishedChapters:12,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2754-6713",doi:"10.5772/intechopen.100362",isOpenForSubmission:!0},{id:"10",title:"Physiology",numberOfPublishedBooks:11,numberOfPublishedChapters:141,numberOfOpenTopics:4,numberOfUpcomingTopics:0,issn:"2631-8261",doi:"10.5772/intechopen.72796",isOpenForSubmission:!0}],hsSeriesList:[{id:"3",title:"Dentistry",numberOfPublishedBooks:8,numberOfPublishedChapters:133,numberOfOpenTopics:2,numberOfUpcomingTopics:0,issn:"2631-6218",doi:"10.5772/intechopen.71199",isOpenForSubmission:!0},{id:"6",title:"Infectious Diseases",numberOfPublishedBooks:13,numberOfPublishedChapters:113,numberOfOpenTopics:3,numberOfUpcomingTopics:1,issn:"2631-6188",doi:"10.5772/intechopen.71852",isOpenForSubmission:!0},{id:"13",title:"Veterinary Medicine and Science",numberOfPublishedBooks:11,numberOfPublishedChapters:107,numberOfOpenTopics:3,numberOfUpcomingTopics:0,issn:"2632-0517",doi:"10.5772/intechopen.73681",isOpenForSubmission:!0}],sshSeriesList:[{id:"22",title:"Business, Management and Economics",numberOfPublishedBooks:1,numberOfPublishedChapters:19,numberOfOpenTopics:3,numberOfUpcomingTopics:0,issn:"2753-894X",doi:"10.5772/intechopen.100359",isOpenForSubmission:!0},{id:"23",title:"Education and Human Development",numberOfPublishedBooks:0,numberOfPublishedChapters:5,numberOfOpenTopics:1,numberOfUpcomingTopics:1,issn:null,doi:"10.5772/intechopen.100360",isOpenForSubmission:!0},{id:"24",title:"Sustainable Development",numberOfPublishedBooks:0,numberOfPublishedChapters:16,numberOfOpenTopics:5,numberOfUpcomingTopics:0,issn:null,doi:"10.5772/intechopen.100361",isOpenForSubmission:!0}],testimonialsList:[{id:"6",text:"It is great to work with the IntechOpen to produce a worthwhile collection of research that also becomes a great educational resource and guide for future research endeavors.",author:{id:"259298",name:"Edward",surname:"Narayan",institutionString:null,profilePictureURL:"https://mts.intechopen.com/storage/users/259298/images/system/259298.jpeg",slug:"edward-narayan",institution:{id:"3",name:"University of Queensland",country:{id:null,name:"Australia"}}}},{id:"13",text:"The collaboration with and support of the technical staff of IntechOpen is fantastic. 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