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Optical Engineering

Nonlinear phase noise in coherent polarization-multiplexed quadrature phase-shift keying systems over dispersion managed link
Author(s): Xiaogang Yi; Fangzheng Zhang; Jian Wu; Yan Li; Wei Li; Xiaobin Hong; Hongxiang Guo; Yong Zuo; Jintong Lin
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Paper Abstract

Nonlinear phase noise (NLPN) induced by the interaction between the amplified spontaneous emission noise (ASE) and the information signal in polarization-multiplexed quadrature phase-shift keying (PM-QPSK) systems at 42.8(112) Gbit/s over dispersion-managed (DM) link is investigated by numerical simulations. Both symbol-aligned non-return-to-zero (NRZ) PM-QPSK and symbol-interleaved return-to-zero (RZ) PM-QPSK formats are considered and compared. We find that for aligned NRZ-PM-QPSK systems, the impact of NLPN on system performance seems rather weak due to the strong interchannel cross-polarization modulation (XPolM). However, when the interleaved RZ-PM-QPSK format is used, in which the XPolM is suppressed significantly, the system performance is seriously degraded by NLPN, especially at low bit rates. Results of 1000-km transmission employing standard single-mode fiber (SSMF) over DM link show that for 42.8 Gbit/s coherent RZ-PM-QPSK systems, the nonlinear threshold (NLT) will decrease from 6 to 2 dBm due to nonlinear phase noise when symbol-interleaved format is used.

Paper Details

Date Published: 18 July 2012
PDF: 7 pages
Opt. Eng. 51(7) 075003 doi: 10.1117/1.OE.51.7.075003
Published in: Optical Engineering Volume 51, Issue 7
Show Author Affiliations
Xiaogang Yi, Beijing Univ. of Posts and Telecommunications (China)
Fangzheng Zhang, Beijing Univ. of Posts and Telecommunications (China)
Jian Wu, Beijing Univ. of Posts and Telecommunications (China)
Yan Li, Beijing Univ. of Posts and Telecommunications (China)
Wei Li, Beijing Univ. of Posts and Telecommunications (China)
Xiaobin Hong, Beijing Univ. of Posts and Telecommunications (China)
Hongxiang Guo, Beijing Univ. of Posts and Telecommunications (China)
Yong Zuo, Beijing Univ. of Posts and Telecommunications (China)
Jintong Lin, Beijing Univ. of Posts and Telecommunications (China)


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