Carrier phase estimation scheme for faster-than-Nyquist optical coherent communication systems  

作　　者：李程程 潘董威 冯一乔 林嘉川 席丽霞 唐先锋 张文博 张晓光 

机构地区：[1]State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications [2]School of Science,Beijing University of Posts and Telecommunications

出　　处：《Chinese Optics Letters》2016年第10期15-19,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.61571057,61527820,and 61575082);the Open Fund of the Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications(Jinan University)

摘　　要：We propose a modified-Viterbi and Viterbi phase estimation （VVPE） carrier phase recovery scheme that shows an effective capability of reducing the frequent and accumulated cycle slips induced by inter-symbol interference （ISI） in a faster-than-Nyquist （FTN） optical coherent communications system. In a 28-Gbaud FTN polarization- division multiplexed quadrature phase-shift keying optical communication system, the comparison of the pro- posed modified-WPE scheme and the conventional VVPE scheme is carried out. It is proved that the proposed modified-VVPE scheme can effectively overcome the challenge of ISI induced error carrier phase estimation, which leads to a better bit error ratio performance.We propose a modified-Viterbi and Viterbi phase estimation （VVPE） carrier phase recovery scheme that shows an effective capability of reducing the frequent and accumulated cycle slips induced by inter-symbol interference （ISI） in a faster-than-Nyquist （FTN） optical coherent communications system. In a 28-Gbaud FTN polarization- division multiplexed quadrature phase-shift keying optical communication system, the comparison of the pro- posed modified-WPE scheme and the conventional VVPE scheme is carried out. It is proved that the proposed modified-VVPE scheme can effectively overcome the challenge of ISI induced error carrier phase estimation, which leads to a better bit error ratio performance.

关 键 词：Phase shift Phase shift keying Quadrature phase shift keying 

分 类 号：TN929.1[电子电信—通信与信息系统]