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Open AccessArticle

Accuracy Assessment of Nondispersive Optical Perturbative Models through Capacity Analysis

Department of Electrical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden
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Author to whom correspondence should be addressed.
Entropy 2019, 21(8), 760; https://doi.org/10.3390/e21080760
Received: 20 May 2019 / Revised: 18 July 2019 / Accepted: 28 July 2019 / Published: 5 August 2019
(This article belongs to the Section Information Theory, Probability and Statistics)
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Abstract

A number of simplified models, based on perturbation theory, have been proposed for the fiber-optical channel and have been extensively used in the literature. Although these models are mainly developed for the low-power regime, they are used at moderate or high powers as well. It remains unclear to what extent the capacity of these models is affected by the simplifying assumptions under which they are derived. In this paper, we consider single-channel data transmission based on three continuous-time optical models: (i) a regular perturbative channel, (ii) a logarithmic perturbative channel, and (iii) the stochastic nonlinear Schrödinger (NLS) channel. To obtain analytically tractable discrete-time models, we consider zero-dispersion fibers and a sampling receiver. We investigate the per-sample capacity of these models. Specifically, (i) we establish tight bounds on the capacity of the regular perturbative channel; (ii) we obtain the capacity of the logarithmic perturbative channel; and (iii) we present a novel upper bound on the capacity of the zero-dispersion NLS channel. Our results illustrate that the capacity of these models departs from each other at high powers because these models yield different capacity pre-logs. Since all three models are based on the same physical channel, our results highlight that care must be exercised in using simplified channel models in the high-power regime. View Full-Text
Keywords: achievable rate; channel capacity; information theory; nonlinear channel; optical fiber achievable rate; channel capacity; information theory; nonlinear channel; optical fiber
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Keykhosravi, K.; Durisi, G.; Agrell, E. Accuracy Assessment of Nondispersive Optical Perturbative Models through Capacity Analysis. Entropy 2019, 21, 760.

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