Improving the Achievable Rates of Optical Coherent Transmission with Back-Propagation
Journal article, 2018

The power allocation in wavelength-division multi- plexed (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.

Optical coherent communications

digital back-propagation

time-domain nonlinear noise model

Gaussian noise nonlinear model

convex power optimization


Hami Rabbani

K. N. Toosi University of Technology

Hamed Rabbani

Huawei Technology Company

Lotfollah Beygi

K. N. Toosi University of Technology

Erik Agrell

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

IEEE Photonics Technology Letters

1041-1135 (ISSN)

Vol. 30 14 1273-1276

Subject Categories


Communication Systems

Other Electrical Engineering, Electronic Engineering, Information Engineering



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