Abstract

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 proposed modified-VVPE 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.

© 2016 Chinese Laser Press

Continuous-variable quantum key distribution based on a faster-than-Nyquist scheme

Yaxi Pan, Ling Zhang, Ying Guo, and Duan Huang
J. Opt. Soc. Am. B 37(3) 665-672 (2020)

Low overhead slipless carrier phase estimation scheme

Haiquan Cheng, Yan Li, Deming Kong, Jizhao Zang, Jian Wu, and Jintong Lin
Opt. Express 22(17) 20740-20747 (2014)

Feed-forward carrier phase recovery for offset-QAM Nyquist WDM transmission

Haoyuan Tang, Meng Xiang, Songnian Fu, Ming Tang, Perry Shum, and Deming Liu
Opt. Express 23(5) 6215-6227 (2015)

Joint timing recovery and adaptive equalization based on training sequences for PM-16QAM faster-than-Nyquist WDM systems

Jialin You, Tao Yang, Yongben Wang, Weiqin Zhou, Liqian Wang, and Xue Chen
Opt. Express 31(20) 33421-33434 (2023)

Relative phase noise estimation and mitigation in Raman amplified coherent optical communication system

Jingchi Cheng, Ming Tang, Songnian Fu, Perry Ping Shum, Deming Liu, Meng Xiang, Zhenhua Feng, and Dawei Yu
Opt. Express 22(2) 1257-1266 (2014)