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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 16 — Aug. 3, 2009
  • pp: 13395–13401

MAP detection for impairment compensation in coherent WDM systems

J. Zhao and A. D. Ellis  »View Author Affiliations


Optics Express, Vol. 17, Issue 16, pp. 13395-13401 (2009)
http://dx.doi.org/10.1364/OE.17.013395


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Abstract

We propose a novel recursive-algorithm based maximum a posteriori probability (MAP) detector in spectrally-efficient coherent wavelength division multiplexing (CoWDM) systems, and investigate its performance in a 1-bit/s/Hz on-off keyed (OOK) system limited by optical-signal-to-noise ratio. The proposed method decodes each sub-channel using the signal levels not only of the particular sub-channel but also of its adjacent sub-channels, and therefore can effectively compensate deterministic inter-sub-channel crosstalk as well as inter-symbol interference arising from narrow-band filtering and chromatic dispersion (CD). Numerical simulation of a five-channel OOK-based CoWDM system with 10Gbit/s per channel using either direct or coherent detection shows that the MAP decoder can eliminate the need for phase control of each optical carrier (which is necessarily required in a conventional CoWDM system), and greatly relaxes the spectral design of the demultiplexing filter at the receiver. It also significantly improves back-to-back sensitivity and CD tolerance of the system.

© 2009 OSA

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4080) Fiber optics and optical communications : Modulation

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: March 6, 2009
Revised Manuscript: May 27, 2009
Manuscript Accepted: June 2, 2009
Published: July 20, 2009

Citation
J. Zhao and A. D. Ellis, "MAP detection for impairment compensation in coherent WDM systems," Opt. Express 17, 13395-13401 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-16-13395


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References

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