Low-complexity amplitude-division irregular QAM formats for short-reach unamplified coherent optical systems

被引：2
|
作者：
Fu, M. E. N. G. F. A. N. [1 ]
Jiang, H. E. X. U. N. [1 ]
Liu, Q. I. A. O. Y. A. [1 ]
Fan, Y. U. N. Y. U. N. [1 ]
Zeng, X. I. A. O. B. O. [1 ]
Yi, L. I. L. I. N. [1 ]
Hu, W. E. I. S. H. E. N. G. [1 ,2 ]
Zhuge, Q. U. N. B., I [1 ,2 ]
机构：
[1] Shanghai Jiao Tong Univ, Dept Elect Engn, State Key Lab Adv Opt Commun Syst & Networks, Shanghai 200240, Peoples R China
[2] Peng Cheng Lab, Shenzhen 518000, Peoples R China
来源：
OPTICS LETTERS | 2023年 / 48卷 / 11期
基金：
中国国家自然科学基金;
关键词：
EFFICIENT; DESIGN;
D O I：
10.1364/OL.487996
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A low-complexity scheme is proposed to realize irreg-ular uniform quadrature amplitude modulation (QAM) formats with Gray mapping, which are named amplitude -division irregular QAM (AD-Ir-QAM) formats. Com-pared to conventional probabilistic shaping (PS) with the Maxwell-Boltzmann (MB) distribution (PS-MB), irregular QAM formats show a smaller peak-to-average power (PAPR) and achieve a better performance in systems with the peak -power constraint. Compared with irregular QAM formats realized by PS (PS-Ir-QAM), AD-Ir-QAM formats realize a more flexible rate adaptation and have a lower imple-mentation complexity. Experimental results obtained in an unamplified coherent optical system show that, at a gen-eralized mutual information (GMI) of 4.5 bits/2D-symbol, AD-Ir-100QAM achieves gains of 2.1 and 0.5 dB in the power budget over PS-MB-100QAM and PS-Ir-100QAM, respec-tively. & COPY; 2023 Optica Publishing Group
引用
收藏
页码：2901 / 2904
页数：4
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