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Influence des amplificateurs optiques à semi-conducteurs (SOA) sur la transmission cohérente de signaux optiques à format de modulation multi-porteuses (CO-OFDM)

Abstract : Future wavelength division multiplexing (WDM) systems might take advantage from the use of semiconductor optical amplifiers (SOA), especially to benefit from their large optical bandwidth for signal amplification. In this work, we study the influence of SOAs on the coherent optical-OFDM (CO OFDM) transmission system. This recently proposed technique allows both to increase the spectral efficiency of the transmission and to compensate the linear imperfections of the optical channel.In this work, we have developed an experimental setup for signal transmission operating with advanced optical modulation formats and a system level simulation platform. Simulation results, both at the component level and at the system level, are in very good agreement with those obtained from experimental measurements in the case of both QPSK and QPSK CO-OFDM signals. The study has clearly identified, through various measurements and simulations, the influence of SOA parameters on the quality of data transmission. Nonlinearities induced by the SOA, such as phase-amplitude coupling, self gain and phase modulation (SGM and SPM), cross gain and phase modulation (XGM and XPM) and the four-wave mixing (FWM) affect the performances of this multicarrier modulation format. Their influence is studied very precisely in this work. This acquired knowledge will allow, on the one hand, better defining the conditions of use of SOAs in the transmission networks and, on the other hand, helping to optimize new structures of SOA designed for very high bit rate data transmissions using complex modulation formats.
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Hamidreza Khaleghi. Influence des amplificateurs optiques à semi-conducteurs (SOA) sur la transmission cohérente de signaux optiques à format de modulation multi-porteuses (CO-OFDM). Autre. Université de Bretagne occidentale - Brest, 2012. Français. ⟨NNT : 2012BRES0034⟩. ⟨tel-00829663⟩

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