Jean-Michel Gabriagues

Design, modelling and implementation of the ATMOS project fibre delay line photonic switching matrix

This paper presents the fibre delay line switching matrix, a high-performance photonic system consisting of an electrically controlled optical high-speed transport network. This photonic matrix adopts the asynchronous transfer mode (ATM) technique and an internal self-routing architecture based on wavelength encoding, for cell routing and multiplexing. A set of output queues provides the buffering function.An extensive performance evaluation is presented, with reference to both the traffic throughput and technology feasibility. Numerical results have been obtained to evaluate optical performance and the implementation of a 4×4 demonstrator, supporting a 2.5 Gbit s-1 input/output rate, shows the feasibility of the matrix with state-of-the-art optical technology.Its high performance makes the fibre delay line switching matrix a strong candidate for implementing the core of future high-speed broadband ATM switches.

Second harmonic generation in optical fibers

We describe second harmonic generation in silica based optical fibers as a function of time and the preliminary explanations published so far in the literature. The latter deal essentially with the electromagnetic aspect of the phenomenon. By a different way of analysis (closer to material science), we emphasize on the structural defects active in this non-linear property.AnalyseOn presente les caracteristiques temporelles du doublage de frequence dans les fibres optiques en verre de silice dopee et les interpretations preliminaires qui en ont ete donnees. Celles-ci se limitent a I’heure actuelle aux caracteres electromagnetiques du pheno-mene. Par une analyse differente du phenomene, plus proche du materiau, les auteurs tentent de degager quelques caracteristiques des defauts de structure pouvant etre impliques.

Design Implementation of a Gigabit ATM Photonic Switching Matrix

This paper presents a high-performance ATM photonic switching matrix, consisting of an all-optical self-routing high-speed network electrically controlled. The matrix internal architecture is based on wavelength encoding, for cell routing and multiplexing, and on output queueing, for providing the buffering function: its operating principles are fully illustrated. The matrix optical key components are described in detail, discussing as well the main physical constraints imposed by their current characteristics, and their impact on the matrix dimensioning are discussed. Finally, a rack-mounted, reduced size demonstrator, a 4 x 4 matrix supporting a 2.5 Gbit/s input/output rate, has been implemented and the obtained good results in terms of bit error rate and of hardware integration and reliability are reported. This demonstrator shows the switch feasibility with state-of-the-art optical technology.