Probabilistic shaping of quadrature amplitude modulation (QAM) is used to enhance the sensitivity of an optical communication system. Sensitivity gains of 0.43 dB and 0.8 dB are demonstrated in back-to-back experiments by shaping of 16QAM and 64QAM, respectively. Further, numerical simulations are used to prove the robustness of probabilistic shaping to a mismatch between the constellation used and the signal-to-noise ratio (SNR) of the channel. It is found that, accepting a 0.1 dB SNR penalty, only four shaping distributions are required to support these gains for 64QAM.
@article{arxiv.1510.03565,
title = {Sensitivity Gains by Mismatched Probabilistic Shaping for Optical Communication Systems},
author = {Tobias Fehenberger and Domaniç Lavery and Robert Maher and Alex Alvarado and Polina Bayvel and Norbert Hanik},
journal= {arXiv preprint arXiv:1510.03565},
year = {2016}
}
Comments
Title and introduction were updated and the discussion of Section IV-B was extended. Additionally, some minor modifications were made to the manuscript