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Outils avancés de traitement de signal pour les systèmes de communications optiques utilisant les formats de modulation d'amplitude en quadrature (QAM)

Abstract : During the last years, broadband services and Internet applications have boomed, causing saturation issues in the networks and leading to an increase in bandwidth demand. This pushed carriers to increase the capacity of WDM channels by introducing 100G and beyond systems in core and Metro networks. With the new possibilities offered by the high speed digital circuits, coherent systems have attracted a lot of attention during the last years. Apart from the receiver sensitivity, the interest lies now in the increase of spectral efficiency as well as tolerance against dispersion effects and fiber nonlinearities. In the framework of this thesis, we develop robust Digital Signal Processing (DSP) tools specific to the optical channel using polarization multiplexing (POLMUX) and Qaudrature Amplitude Modulation (QAM). Those algorithms at least deal with the operations of carrier phase recovery, frequency offset estimation, equalization and the tracking of the variation of Polarization Mode dispersion (PMD). Knowing that those algorithms are to be implemented in circuits running at some tens of MHz, the optimization of those tools is essential. Moreover, the already proposed tools are well adapted for phase modulation formats, and as QAM formats are more sensitive to signal distortions, accurate estimators and robust equalizers are still required. Our proposed algorithms are tested using a simulation setup of an optical transmission system using coherent detection and POLMUX-16QAM modulation. They are also validated with offline processing of real measurements carried out in the Heinrich Hertz Institut, Berlin in the framework of the European Network of Excellence EURO-FOS.
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Contributor : Mehrez Selmi <>
Submitted on : Monday, March 5, 2012 - 6:39:43 PM
Last modification on : Friday, July 31, 2020 - 10:44:07 AM
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Mehrez Selmi. Outils avancés de traitement de signal pour les systèmes de communications optiques utilisant les formats de modulation d'amplitude en quadrature (QAM). Traitement du signal et de l'image [eess.SP]. Télécom ParisTech, 2011. Français. ⟨pastel-00676646⟩

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