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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 20 — Sep. 26, 2011
  • pp: 19042–19049

Experimental study of non-binary LDPC coding for long-haul coherent optical QPSK transmissions

Shaoliang Zhang, Murat Arabaci, Fatih Yaman, Ivan B. Djordjevic, Lei Xu, Ting Wang, Yoshihisa Inada, Takaaki Ogata, and Yasuhiro Aoki  »View Author Affiliations


Optics Express, Vol. 19, Issue 20, pp. 19042-19049 (2011)
http://dx.doi.org/10.1364/OE.19.019042


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Abstract

The performance of rate-0.8 4-ary LDPC code has been studied in a 50GHz-spaced 40Gb/s DWDM system with PDM-QPSK modulation. The net effective coding gain of 10dB is obtained at BER of 10−6. With the aid of time-interleaving polarization multiplexing and MAP detection, 10,560km transmission over legacy dispersion managed fiber is achieved without any countable errors. The proposed nonbinary quasi-cyclic LDPC code achieves an uncoded BER threshold at 4×10−2. Potential issues like phase ambiguity and coding length are also discussed when implementing LDPC in current coherent optical systems.

© 2011 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.4080) Fiber optics and optical communications : Modulation

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: June 1, 2011
Revised Manuscript: July 29, 2011
Manuscript Accepted: July 30, 2011
Published: September 15, 2011

Citation
Shaoliang Zhang, Murat Arabaci, Fatih Yaman, Ivan B. Djordjevic, Lei Xu, Ting Wang, Yoshihisa Inada, Takaaki Ogata, and Yasuhiro Aoki, "Experimental study of non-binary LDPC coding for long-haul coherent optical QPSK transmissions," Opt. Express 19, 19042-19049 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-20-19042


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