Improving the Achievable Rates of Optical Coherent Transmission with Back-Propagation
Artikel i vetenskaplig tidskrift, 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.

time-domain nonlinear noise model

Gaussian noise nonlinear model

digital back-propagation

convex power optimization

Optical coherent communications


Hami Rabbani

K. N. Toosi University of Technology

Hamed Rabbani


Lotfollah Beygi

K. N. Toosi University of Technology

Erik Agrell

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

IEEE Photonics Technology Letters

1041-1135 (ISSN) 19410174 (eISSN)

Vol. 30 14 1273-1276




Annan elektroteknik och elektronik



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