On Achievable Rates for Long-Haul Fiber-Optic Communications

Abstract

Lower bounds on mutual information (MI) of long-haul optical fiber systems for hard-decision and soft-decision decoding are studied. Ready-to-use expressions to calculate the MI are presented. Extensive numerical simulations are used to quantify how changes in the optical transmitter, receiver, and channel affect the achievable transmission rates of the system. Special emphasis is put to the use of different quadrature amplitude modulation formats, channel spacings, digital back-propagation schemes and probabilistic shaping. The advantages of using MI over the prevailing $Q$-factor as a figure of merit of coded optical systems are also highlighted.

arXiv commentHard decision mutual information analysis added, two typos corrected

References in corpus (2)

• LDPC Coded Modulation with Probabilistic Shaping for Optical Fiber Systems
• A Pragmatic Coded Modulation Scheme for High-Spectral-Efficiency Fiber-Optic Communications

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