Clipping discrete multi-tone for peak-power-constraint IM/DD optical systems  

作　　者：Ji ZHOU Liangchuan LI Jiale HE Xiaofeng LU Yu BO Guanyu WANG Yuanda HUANG Gengchen LIU Yanzhao LU Shecheng GAO Yuanhua FENG Shancheng ZHAO Weiping LIU Changyuan YU Zhaohui LI 

机构地区：[1]Department of Electronic Engineering,College of Information Science and Technology,Jinan University,Guangzhou 510632,China [2]Optical Research Department,Huawei Technologies Co.,Ltd.,Dongguan 523808,China [3]Department of Electronic and Information Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China [4]Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems,Sun Yat-sen University,Guangzhou 510275,China [5]Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 511458,China

出　　处：《Science China(Information Sciences)》2023年第5期223-233,共11页中国科学（信息科学）（英文版）

基　　金：supported in part by National Key R&D Program of China(Grant No.2018YFB1802300);National Natural Science Foundation of China(Grant Nos.62005102,U2001601,61971372);Natural Science Foundation of Guangdong Province(Grant No.2019A1515011059);Guangzhou Basic and Applied Basic Research Foundation(Grant No.202102020996);Fundamental Research Funds for the Central Universities(Grant No.21619309);Open Fund of IPOC(BUPT)(Grant No.IPOC2019A001);Hong Kong Scholars Program(Grant No.XJ2021018)。

摘　　要：High peak-to-average power ratio(PAPR)is a major drawback of discrete multi-tone(DMT)in peak-power-constraint(PPC)intensity-modulation/direct-detection(IM/DD)optical systems.Symmetric clipping operation is a frequently-used and practical method for mitigating the PAPR of the DMT signal.However,clipping noise is inevitably induced by the symmetric clipping operation,thereby deteriorating the system’s performance.In this paper,we study the statistical characteristics of the clipping noise in detail.Depending on the statistical characteristics,clipping-noise-cancellation(CNC)algorithms are proposed to mitigate the clipping noise in the clipping DMT systems.Theoretically,the clipping noise can be completely removed using the low-density-parity-check-assisted CNC algorithm(LDPC-assisted CNC algorithm).To verify the superiority of the clipping DMT with the CNC algorithm,we conduct an experiment with a50 Gb/s DMT system using 10G-class commercial devices for the scenario of PPC passive optical networks.The receiver sensitivity of the clipping DMT system with the CNC algorithm can reach-24 d Bm at a 20%soft-decision forward-error-correction limit,which is 2.5 d B higher than that of the DMT system without clipping operation.The clipping operation and the CNC algorithm are added after the original digital signal processing,thereby demonstrating the potential to efectively overcome the drawback in DMT signals and other high-PAPR signals.

关 键 词：discrete multi-tone peak-to-average power ratio peak-power constraint clipping-noise cancellation intensity-modulation/direct-detection optical systems 

分 类 号：TN929.1[电子电信—通信与信息系统]