Capacity Region Bounds for the K user Dispersive Nonlinear Optical WDM Channel with Peak Power Constraints

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Abstract

It is known that fiber nonlinearities induce crosstalk in a wavelength division multiplexed (WDM) system, which limits the capacity of such systems especially at higher signal powers. Traditionally, the channel capacity of a single WDM user is analyzed under different assumptions for the transmitted signals of the other users. In this paper, we instead take a multi-user information theoretic view of an optical WDM channel impaired by cross-phase modulation and dispersion as an interference channel. We characterize, for the first time, an outer bound on the capacity region of simultaneously achievable rate pairs, assuming a general K-user perturbative channel model using genie-aided techniques. Furthermore, an achievable rate region is obtained by time-sharing between certain single-user strategies, and it is shown that the latter can achieve better rate tuples compared to treating nonlinear interference as noise.
Original languageEnglish
Article number2110.09405
Number of pages8
JournalarXiv
Volume2021
Publication statusPublished - 18 Oct 2021

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