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Techniques de pré-distorsion numérique pour l'optimisation des réseaux d'accès optiques

Abstract : The increase in bandwidth and access flexibility are major challenges for future telecommunication networks. In this context, optical fiber is an essential transmission medium that nowadays allows symmetrical data rates in the Gb/s range. The coherent detection and use of multi-carrier modulation formats has recently had a profound impact in the field of optical communications. One of the most notable implementations is the coherent optical OFDM (CO-OFDM). However, OFDM has a significant peak factor due to the various non-linearities of the channel, which is a downside limiting its performance.The objective of this thesis was to optimize the performance of the CO-OFDM transmission system by exploring the pre-distortion of digital baseband signals for linearization of the transmitter, and mainly of the semiconductor optical amplifier (SOA). Various pre-distortion algorithms were evaluated and have shown their impact on the trade-off between performance and low parametric complexity.As the pre-distortion system is non-adaptive, its robustness with respect to variations in transmitter characteristics and amplifier operating point was evaluated. The optimization of a particular pre-distortion structure has also been proposed.
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Mohamad Younes. Techniques de pré-distorsion numérique pour l'optimisation des réseaux d'accès optiques. Traitement du signal et de l'image [eess.SP]. Université de Bretagne occidentale - Brest, 2019. Français. ⟨NNT : 2019BRES0044⟩. ⟨tel-02951487⟩

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