Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 30, Issue 14, Pages 1273-1276Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2018.2839652
Keywords
Optical coherent communications; Gaussian noise nonlinear model; digital back-propagation; time-domain nonlinear noise model; convex power optimization
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The power allocation in wavelength-division multiplexed (WDM) fiber-optic links with digital back-propagation (BP) is optimized in order to improve the achievable rates (AR). The power allocation is performed using a convex optimization technique based on a modulation-format-dependent time-domain model capable of including the nonlinear Kerr effects. In a fully loaded WDM link with heterogeneous (uneven) nonlinear interference noise (NLIN) spectrum, the AR gain of nonlinear BP over linear electronic dispersion compensation is 60% larger if per-channel power optimization is allowed than if all transceivers use an equal (flat) optimized power. The heterogeneous NLIN spectrum results from performing BP on a subset of the channels. However, the gain of per-channel power optimization disappears for the homogeneous (nearly flat) NLIN spectrum. Moreover, we show that the improvement obtained by joint channel power allocation is more pronounced for links with a larger number of spans.
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