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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 15 — Jul. 16, 2012
  • pp: 17183–17191

Impact of nonlinear signal-noise interactions on symbol-aligned and -interleaved formats in dispersion managed coherent PM-QPSK systems

Xiaogang Yi, Yan Li, Jian Wu, Kun Xu, and Jintong Lin  »View Author Affiliations

Optics Express, Vol. 20, Issue 15, pp. 17183-17191 (2012)

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Using numerical simulations, the impact of nonlinear signal-noise interactions (NSNI) between the amplified spontaneous emission noise (ASE) and the information signal on polarization-multiplexed quadrature phase-shift keying (PM-QPSK) systems at 42.8 (112)-Gbit/s is investigated over dispersion-managed (DM) link. Both symbol-aligned and symbol-interleaved formats are considered and compared. We find that for symbol-aligned PM-QPSK systems, the impact of NSNI on system performance seems rather weak due to the strong inter-channel cross-polarization modulation (XPolM). However, when the symbol-interleaved format is used, in which the XPolM is suppressed significantly, the system performance is seriously degraded by NSNI, especially at low bit-rate. Results of 1000-km transmission employing standard single-mode fiber (SSMF) over DM link show that for 42.8-Gbit/s coherent PM-QPSK systems, the nonlinear threshold (NLT) will decrease from 5.8dBm to 0.6dBm due to the nonlinear signal-noise interactions when symbol-interleaved RZ format is used.

© 2012 OSA

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: April 18, 2012
Revised Manuscript: June 14, 2012
Manuscript Accepted: July 1, 2012
Published: July 12, 2012

Xiaogang Yi, Yan Li, Jian Wu, Kun Xu, and Jintong Lin, "Impact of nonlinear signal-noise interactions on symbol-aligned and -interleaved formats in dispersion managed coherent PM-QPSK systems," Opt. Express 20, 17183-17191 (2012)

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