Open AccessCorrelated digital back propagation based on perturbation theory
Author(s) -
Xiaojun Liang,
Shiva Kumar
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.014655
Subject(s) - optics , quadrature amplitude modulation , physics , nonlinear system , amplitude , nonlinear distortion , phase modulation , perturbation (astronomy) , telecommunications , bandwidth (computing) , phase noise , bit error rate , channel (broadcasting) , computer science , amplifier , quantum mechanics
We studied a simplified digital back propagation (DBP) scheme by including the correlation between neighboring signal samples. An analytical expression for calculating the correlation coefficients is derived based on a perturbation theory. In each propagation step, nonlinear distortion due to phase-dependent terms in the perturbative expansion are ignored which enhances the computational efficiency. The performance of the correlated DBP is evaluated by simulating a single-channel single-polarization fiber-optic system operating at 28 Gbaud, 32-quadrature amplitude modulation (32-QAM), and 40 × 80 km transmission distance. As compared to standard DBP, correlated DBP reduces the total number of propagation steps by a factor of 10 without performance penalty. Correlated DBP with only 2 steps per link provides about one dB improvement in Q-factor over linear compensation.