Performance enhancement with geometrically shaped 4/8D-SP-50QAM for DDO-OFDM system

被引：1
作者：
Song, Ruoling [1 ,2 ,3 ]
Ma, Jie [1 ,2 ,3 ]
Lu, Jia [1 ,2 ,3 ]
Liu, Jianfei [1 ,2 ,3 ]
Wang, Yulei [1 ,2 ,3 ]
Zeng, Xiangye [1 ,2 ,3 ]
Luo, Mingming [1 ,2 ,3 ]
机构：
[1] Hebei Univ Technol, Sch Elect & Informat Engn, Tianjin 300401, Peoples R China
[2] Tianjin Key Lab Elect Mat & Devices, Tianjin 300401, Peoples R China
[3] Hebei Prov Key Lab Adv Laser Technol & Equipment, Tianjin 300401, Peoples R China
来源：
OPTICS COMMUNICATIONS | 2024年 / 568卷
基金：
中国国家自然科学基金;
关键词：
Direct detection optical orthogonal frequency; division multiplexing; Set partitioning; Spectral efficiency; Generalized mutual information; Multi-dimensional modulation; MODULATION FORMAT; SCHEME; SIGNAL;
D O I：
10.1016/j.optcom.2024.130740
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We design the 4-dimensional set-partitioning 50-ary quadrature amplitude modulation (4D-SP-50QAM) and 8DSP-50QAM with 7 bit/symbol in direct detection optical orthogonal frequency division multiplexing (DDOOFDM) systems. Quadrant multiplexing (QM) and orthant symmetry (OS) are respectively used to reduce the number of constellation points and the complexity of constellation mapping, while improving system bandwidth utilization. The proposed 8D-SP-50QAM scheme outperforms 4D-SP-50QAM, 4D-OS-64QAM and 4D 128-ary polarization-ring-switching (4D-128PRS) in terms of generalized mutual information (GMI) and bit error rate (BER) performance at various fiber length. In addition, the GMI gain increases gradually with the increase of fiber length, proving that this scheme can effectively improve system capacity and nonlinear tolerance.
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页数：8
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