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Continuum de fréquences optiques pour application OCDMA

Abstract : This thesis works is in line with high-bit-rate optical access systems, where optical fiber bandwidth is shared between several users. In this context, we interest on Optical Code Division Multiple Access (OCDMA) comunication system is considered as an attractive solution. However, thoses system has disadvantages of being limited terms of capacity multiplexing and undergoes interference from unwanted users. In order to increase the number of users of these systems, we propose two OCDMA systems architectures. The first architecture is a hybrid WDM / OCDMA system based on temporal encoding, including a spectrum-sliced broadband source in order to increase the number of users multiplexed via OCDMA by the number of WDM channels generated. The second architecture is an OCDMA system based on spectral-phase encoding that allows the implementation of bipolar codes. Furthermore, we reduced the Multiple Access Interference (MAI) encountered in these OCDMA systems because of interfering users, by using a fiber-based saturable absorber after the data decoding of the desired user. In the framework of the French National Agency for Research (ANR) project SUPERCODE, we studied continuum source generation and optical implementation of saturable absorber, based on optical nonlinear effects in special fibers; designed and implemented all optical encoders and decoders based on Bragg gratings photo-inscribed in optical fibers; and done sytem integration of proposed architecutres, as well as analysis and evaluation of system performance.
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Submitted on : Sunday, April 3, 2011 - 2:49:31 PM
Last modification on : Friday, October 23, 2020 - 4:37:48 PM
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  • HAL Id : pastel-00582653, version 1



Steevy Cordette. Continuum de fréquences optiques pour application OCDMA. Optique / photonique. Télécom ParisTech, 2010. Français. ⟨pastel-00582653⟩



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