Paul Urquhart

Paul Urquhart is a visiting professor in the Department of Electronic and Electrical Engineering of the Universidad Pública de Navarra (UPNA), Pamplona, Spain, where his research and teaching are on optical communications. He is also a visiting lecturer at the Hochschule Niederrhein, Krefeld, Germany and at ESIEE Paris, France, where he collaborates in research. Dr Urquhart was previously a professor in the Department of Optics at Télécom Bretagne, Brest, France and a senior research engineer at BT Laboratories, Ipswich, UK. He has had a long-standing association with the University of Essex, Colchester, UK, where he has taught optical communications and organised workshops for industry. Throughout his career he has participated in and lead research projects on optical amplifiers, filters and sources, as well as the design and simulation of optically amplified fibre networks for telecommunications and sensing. Paul Urquhart is a FEANI-registered European Engineer (Eur Ing), a member of the Institution of Engineering and Technology (IET) and a chartered engineer.

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Optical amplifiers play a central role in all categories of fibre communications systems and networks. By compensating for the losses exerted by the transmission medium and the components through which the signals pass, they reduce the need for expensive and slow optical-electrical-optical conversion. The photonic gain media, which are normally based on glass- or semiconductor-based waveguides, can amplify many high speed wavelength division multiplexed channels simultaneously. Recent research has also concentrated on wavelength conversion, switching, demultiplexing in the time domain and other enhanced functions. Advances in Optical Amplifiers presents up to date results on amplifier performance, along with explanations of their relevance, from leading researchers in the field. Its chapters cover amplifiers based on rare earth doped fibres and waveguides, stimulated Raman scattering, nonlinear parametric processes and semiconductor media. Wavelength conversion and other enhanced signal processing functions are also considered in depth. This book is targeted at research, development and design engineers from teams in manufacturing industry, academia and telecommunications service operators.

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