Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 36, Issue 2, Pages 424-439Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2017.2786351
Keywords
Achievable information rates; coded modulation; generalized mutual information; mutual information; nonlinear fiber channel
Funding
- Netherlands Organisation for Scientific Research via the VIDI Grant ICONIC [15685]
- Technical University of Munich Graduate School Partnership Mobility Grant
- National Natural Science Foundation of China [61701155]
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In this paper, achievable information rates (AIR) for fiber optical communications are discussed. It is shown that AIRs such as the mutual information and generalized mutual information are good design metrics for coded optical systems. The theoretical predictions of AIRs are compared to the performance of modern codes including low-parity density check and polar codes. Two different computation methods for these AIRs are also discussed: Monte-Carlo integration and Gauss-Hermite quadrature. Closed-form ready-to-use approximations for such computations are provided for arbitrary constellations and the multidimensional AWGN channel. The computation of AIRs in optical experiments and simulations is also discussed.
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