A novel four dimensional constellation shaping with non-uniform signaling for long-haul fiber-optic communication

被引：3

作者：

Wang, Feng ^{[1
]}

Hu, Guijun ^{[1
]}

Li, Zhaoxi ^{[1
]}

机构：

[1] Jilin Univ, Coll Commun Engn, 5372 Nanhu Rd, Changchun 130012, Peoples R China

来源：

OPTICS COMMUNICATIONS | 2021年 / 486卷

关键词：

Optical fiber communication; Coherent communications; Constellation shaping;

D O I：

10.1016/j.optcom.2021.126755

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this paper, a new four-dimensional (4D) constellation shaping scheme is proposed for long-haul fiber-optic system to approach the optimal performance. The scheme designs a non-uniform signaling for 4D 80-ary multisphere distribution (4D-80MD) constellation by combining constellation shaping of four dimensions with pragmatic low density parity check (LDPC) code modulation. Additionally, the design of multisphere distribution is introduced based on a bounded-energy enumerative amplitude trellis. The proposed 4D-80MD constellation has the same spectral efficiency (SE) as the conventional polarization-multiplexed 8-ary quadrature-amplitude modulation (PM-8QAM). We study the efficiency of 4D-80MD, combined with bitinterleaved coded-modulation with iterative decoding, and demonstrate in back-to-back system that the proposed 4D-80MD outperforms PM-8QAM about 1 dB For a long-haul optical fiber system, the optimized 4D-80MD is able to achieve a reach improvement of up to 21%. The results also show increased rates and reduced non-linear noise compared with 2D shaped signal with the same SE.

引用

页数：6