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New Coding Techniques for High Bit-Rate Optical Transmission Systems

Abstract : Since the development of high-speed electronics, digital signal processing has become essential to optical transmission systems. In particular, equalization now allows compensating signal distortions resulting from the propagation in the fiber. In this thesis, we focus on another type of signal processing: the coding techniques. We present three new ideas in order to improve systems performance by reducing either the bit-error rate or the receiver complexity. Forward-error correction has been used for many years in optical transmission systems in order to guarantee very low bit-error rates. With the increase of transmission bit rates, more powerful codes are expected such as low-density parity check (LDPC) codes. We study this new family of codes and show its impressive performance. We also propose a new construction of LDPC code that has optimal performance in comparison to codes proposed in the literature. Then we present a new interleaving scheme for optical transmission systems using differential encoding. Our technique leads to performance improvement and allows a large complexity reduction of the receiver. Finally we present a new coding technique for optical systems, based on space-time coding. We show that polarization dependent loss can be almost entirely suppressed in transmissions systems using polarization division multiplexing.
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Submitted on : Wednesday, March 14, 2012 - 4:10:34 PM
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Sami Mumtaz. New Coding Techniques for High Bit-Rate Optical Transmission Systems. Networking and Internet Architecture [cs.NI]. Ecole nationale supérieure des telecommunications - Télécom ParisTech, 2011. English. ⟨NNT : 2011ENST0061⟩. ⟨pastel-00679068⟩

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