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Information Rates of Next-Generation Long-Haul Optical Fiber Systems Using Coded Modulation

Liga, G; Alvarado, A; Agrell, E; Bayvel, P; (2017) Information Rates of Next-Generation Long-Haul Optical Fiber Systems Using Coded Modulation. The Journal of Lightwave Technology , 35 (1) pp. 113-123. 10.1109/JLT.2016.2603419. Green open access

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Abstract

A comprehensive study of the coded performance of long-haul spectrally-efficient WDM optical fiber transmission systems with different coded modulation decoding structures is presented. Achievable information rates are derived for three different square quadrature-amplitude modulation (QAM) formats and the optimal format is identified as a function of distance and specific decoder implementation. The four cases analyzed combine hard-decision (HD) or soft-decision (SD) decoding together with either a bit-wise or a symbol-wise demapper, the last two suitable for binary and nonbinary codes, respectively. The information rates achievable for each scheme are calculated based on the mismatched decoder principle. These quantities represent true indicators of the coded performance of the system for specific decoder implementations and when the modulation format and its input distribution are fixed. In combination with the structure of the decoder, two different receiver-side equalization strategies are also analyzed: electronic dispersion compensation and digital backpropagation. We show that, somewhat unexpectedly, schemes based on nonbinary HD codes can achieve information rates comparable to SD decoders and that, when SD is used, switching from a symbol-wise to a bit-wise decoder results in a negligible penalty. Conversely, from an information-theoretic standpoint, HD binary decoders are shown to be unsuitable for spectrally-efficient, long-haul systems.

Type: Article
Title: Information Rates of Next-Generation Long-Haul Optical Fiber Systems Using Coded Modulation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/JLT.2016.2603419
Publisher version: http://doi.org/10.1109/JLT.2016.2603419
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/
Keywords: Achievable information rates, coded modulation, forward error correction, generalized mutual information, hard-decision decoding, mutual information, nonbinary codes, optical communications, soft-decision decoding
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1526943
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