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.
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)
