C-band 100-GBaud/λ PAM-4 transmission enabled by hardware-efficient nonlinear equalizer with weight-sharing pruning

被引：5
作者：
Cheng, Wenzhuo [1 ,2 ,3 ]
Xiang, Meng [1 ,2 ,3 ]
Yang, Hailin [1 ,2 ,3 ]
Huo, Xuancheng [1 ,2 ,3 ]
Ma, Yunhe [1 ,2 ,3 ]
Li, Jianping [1 ,2 ,3 ]
Fu, Songnian [1 ,2 ,3 ]
Qin, Yuwen [1 ,2 ,3 ,4 ]
机构：
[1] Guangdong Univ Technol, Inst Adv Photon Technol, Sch Informat Engn, Guangzhou 510006, Peoples R China
[2] Guangdong Univ Technol, Guangdong Prov Key Lab Informat Photon Technol, Guangzhou 510006, Peoples R China
[3] Guangdong Univ Technol, Guangdong Prov Key Lab Informat Photon Technol, Guangzhou 51006, Peoples R China
[4] Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519000, Peoples R China
来源：
OPTICS LETTERS | 2023年 / 48卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Clustering algorithms - Computational complexity - Error correction - Pulse amplitude modulation - Single mode fibers;
D O I：
10.1364/OL.477320
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A Volterra nonlinear equalizer (VNLE) can effectively mit-igate both linear and nonlinear impairments arising in intensity-modulation direct-detection (IM-DD) transmission systems. However, the high computational complexity of the VNLE hinders its applications. Here, we propose a hardware-efficient Volterra equalizer with weight-sharing pruning (VE-WSP). Such an equalizer first uses the k -means++ clustering algorithm for the weight sharing within the same cluster, and then ranks the cluster centroid weight for pruning, leading to a significant computational complexity reduction without sacrificing any equalization performance. We experimentally verified that the use of VE-WSP can enable the C-band 100-GBaud/lambda PAM-4 trans-mission over a 1-km standard single-mode fiber (SSMF), to reach the 20% soft-decision forward error correction (SD-FEC) threshold. Meanwhile, the proposed VE-WSP can reduce the computational complexity by 51% and 21%, in terms of multiplication and addition, respectively, in com-parison with the VNLE. (c) 2023 Optica Publishing Group
引用
收藏
页码：351 / 354
页数：4
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