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Information rates o...
Information rates of next-generation long-haul optical fiber systems using coded modulation
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- Liga, Gabriele (författare)
- University College London (UCL)
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- Segovia, Alex Alvarado (författare)
- Technische Universiteit Eindhoven,Eindhoven University of Technology
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- Agrell, Erik, 1965 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Bayvel, Polina (författare)
- University College London (UCL)
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(creator_code:org_t)
- 2017
- 2017
- Engelska.
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 35:1, s. 113-123
- Relaterad länk:
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http://dx.doi.org/10...
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https://research.cha... (primary) (free)
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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 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 softdecision (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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Nyckelord
- generalized mutual information
- soft-decision decoding
- forward error correction
- coded modulation
- optical communications
- Achievable information rates
- mutual information
- nonbinary codes
- hard-decision decoding
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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