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Title: Relative phase noise estimation and mitigation in Raman amplified coherent optical communication system
Authors: Cheng, Jingchi
Tang, Ming
Fu, Songnian
Shum, Perry Ping
Liu, Deming
Xiang, Meng
Feng, Zhenhua
Yu, Dawei
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2014
Source: Cheng, J., Tang, M., Fu, S., Shum, P. P., Liu, D., Xiang, M., et al. (2014). Relative phase noise estimation and mitigation in Raman amplified coherent optical communication system. Optics Express, 22(2), 1257-1266.
Series/Report no.: Optics express
Abstract: The interplay between the stochastic intensity fluctuation of Raman pump laser and cross-phase modulation (XPM) effect in transmission optical fiber leads to additional phase noise, namely, relative phase noise (RPN) of signal in multi-level modulated coherent optical communication system. Both theoretical analysis and quantitative simulation have been performed to investigate the characteristics and impact of RPN. Being low-pass in nature, RPN is different from XPM induced phase noise in PSK/OOK hybrid system, and has not been considered yet. The noise power of RPN can accumulate incoherently along transmission links. With a proper signal model, we study the impact of RPN to the coherent optical communication system through Monte Carlo simulation. RPN will cause more cycle slips in Viterbi-and-Viterbi (V-V) phase estimation (PE), and the quantitative analysis of cycle slip probability is carried out. When using sliding window V-V without any optimization, the Q factor penalty of RPN on DQPSK signal can be as large as around 5 dB in strong RPN condition. However, it can be reduced by over 3 dB when using an optimal block size or optimal averaging weights.
ISSN: 1094-4087
DOI: 10.1364/OE.22.001257
Rights: © 2014 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint (preprint) with permission of Optical Society of America. The paper can be found at the following official DOI: [].  One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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