Open AccessA probabilistically shaped star-CAP-16/32 modulation based on constellation design with honeycomb-like decision regions
Author(s) -
Jianxin Ren,
Bo Liu,
Xinguang Xu,
Lijia Zhang,
Yaya Mao,
Xiangyu Wu,
Ying Zhang,
Lei Jiang,
Xiangjun Xin
Publication year - 2019
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.27.002732
Subject(s) - constellation , star (game theory) , optics , bit error rate , figure of merit , modulation (music) , computer science , physics , telecommunications , acoustics , decoding methods , astronomy , astrophysics
A novel, probabilistically shaped star-CAP-16/32 modulation based on constellation design with honeycomb-like decision regions is proposed in this paper. The proper geometric structural design of the star constellation, along with the probabilistic shaping, is able to achieve better improvement with regards to constellation figure of merit (CFM) and bit error rate (BER) performance. A 25-km standard single-mode fiber (SSMF) data transmission employing the proposed PS star-CAP modulation scheme is successfully demonstrated. Experiment results show that the proposed PS star-CAP-16 in C 4,4,4,4 excels the traditional PS star-CAP-16 in C 8,8 by 1.5 dB in receiver sensitivity at the BER of 1×10 -3 . At the same time, the novel PS star-CAP-32 with entropy of 4.4 bits/symbol defeats the uniform star-CAP-32 by 1.6 dB improvement under the same bit rate.