| Biography | |
|---|---|
 Prof. Mário F.S. Ferreira University of Aveiro, Portugal |
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| Title: ALL-OPTICAL SIGNAL PROCESSING IN OPTICAL FIBERS | |
| Abstract: Nonlinear effects in optical fibers impose different limitations on the communications link, and an understanding of such effects is almost a prerequisite for actual lightwave-system designers. On the other hand, they offer a variety of possibilities for all-optical signal processing, amplification and regeneration. Using conventional optical fibers for these applications, a length of several kilometres is usually required due to their relatively small nonlinear parameter ( ). Such long fibers pose some practical limitations, concerned namely with the size and stability of the system. The required fiber length is reduced to about 1km using highly nonlinear silica fibers with a smaller effective mode area, and hence, a larger nonlinear parameter ( ). A further reduction in fiber length by one order of magnitude has been achieved in recent years using nanowires and microstructured optical fibers with an extremely small effective mode area and significantly enhanced nonlinear characteristics. Another main advance was the production of highly nonlinear fibers using materials with a nonlinear refractive index higher than that of the silica glass, namely lead silicate, tellurite, bismuth glasses and chalcogenide glasses. Using such fibers, the required fiber length for nonlinear processing can be dramatically reduced to the order of centimetres. In this paper we provide a review of the nonlinear effects in optical fibers and the possibility of using them to realize several all-optical signal processing functions. | |
| Biography: Mário F. S. Ferreira graduated in Physics from the University of Porto, Portugal, and received the Ph.D. degree in Physics in 1992 from the University of Aveiro, Portugal, where he is now a Professor at the Physics Department. Between 1990 and 1991 he was at the University of Essex, UK, performing experimental work on external cavity semiconductor lasers and nonlinear optical fiber amplifiers. His research interests have been concerned with the modeling and characterization of multi-section semiconductor lasers for coherent systems, quantum well lasers, optical fiber amplifiers and lasers, soliton propagation, polarization and nonlinear effects in optical fibers. He is actually the leader of the Optics and Optoelectronics Group of the I3N – Institute of Nanostructures, Nanomodelling and Nanofabrication. He has written about 400 scientific journal and conference publications, and several books, namely: “Optics and Photonics” (Lidel, 2003, in Portuguese), “Topics of Mathematical Physics” (Editora Ciência Moderna, 2018, Brazil, in Portuguese), “Optical Fibers: Technology, Communications and recent Advances” (Ed., NOVA Science Publishers, 2017), and “Nonlinear Effects in Optical Fibers” (John Wiley & Sons, OSA, 2011). He was the Guest Editor of two Special Issues of “Fiber and Integrated Optics” (Taylor & Francis): “Fiber Optics in Portugal” (2005) and “Nonlinear Fiber Optics” (2015), and a Special Issue of “Fibers” (MDPI): “Optical Fiber Communications” (2018). Actually, he is Guest Editor of a Special Issue of “Applied Optics” and “Optics Express” (Optical Society of America): “Optical Sensors and Sensing 2019” (2019). He is a member of the Optical Society of America (OSA), SPIE - The International Society for Optical Engineering, The New York Academy of Sciences (NYAS), the American Association for the Advancement of Science (AAAS), the European Optical Society (EOS), the European Physical Society (EPS) and the Portuguese Physical Society. He served in various committees of the Optical Society of America (OSA) and of SPIE – The International Society for Optics and Photonics, having been also a member of the Telecommunications Committee of the “International Association of Science and Technology for Development” (IASTED). He served also in the technical committees of various international conferences. He served as a reviewer of several scientific journals in the area of optics and optoelectronics. He is presently an Associate Editor of “Optical Fiber Technology- Materials, Devices, and Systems” (Elsevier) and a member of the Advisory Board of “Fiber and Integrated Optics” (Taylor & Francis), “Nonlinear Optics, Quantum Optics” (Old City Publishing, Inc.), and “International Journal of Optics” (Hindawi Publishing Corporation). | |
