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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 2 — Jan. 27, 2014
  • pp: 1257–1266

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  »View Author Affiliations


Optics Express, Vol. 22, Issue 2, pp. 1257-1266 (2014)
http://dx.doi.org/10.1364/OE.22.001257


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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.

© 2014 Optical Society of America

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(230.4480) Optical devices : Optical amplifiers

ToC Category:
Optical Communications

History
Original Manuscript: October 1, 2013
Revised Manuscript: December 29, 2013
Manuscript Accepted: January 6, 2014
Published: January 13, 2014

Citation
Jingchi Cheng, Ming Tang, Songnian Fu, Perry Ping Shum, Deming Liu, Meng Xiang, Zhenhua Feng, and Dawei Yu, "Relative phase noise estimation and mitigation in Raman amplified coherent optical communication system," Opt. Express 22, 1257-1266 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-2-1257


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