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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 34, Iss. 9 — May. 1, 2009
  • pp: 1420–1422

Optical LDPC decoders for beyond 100 Gbits/s optical transmission

Ivan B. Djordjevic, Lei Xu, and Ting Wang  »View Author Affiliations

Optics Letters, Vol. 34, Issue 9, pp. 1420-1422 (2009)

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We present an optical low-density parity-check (LDPC) decoder suitable for implementation above 100 Gbits/s, which provides large coding gains when based on large-girth LDPC codes. We show that a basic building block, the probabilities multiplier circuit, can be implemented using a Mach–Zehnder interferometer, and we propose corresponding probabilistic-domain sum-product algorithm (SPA). We perform simulations of a fully parallel implementation employing girth-10 LDPC codes and proposed SPA. The girth-10 LDPC(24015,19212) code of the rate of 0.8 outperforms the BCH ( 128 , 113 ) × BCH ( 256 , 239 ) turbo-product code of the rate of 0.82 by 0.91 dB (for binary phase-shift keying at 100 Gbits/s and a bit error rate of 10 9 ), and provides a net effective coding gain of 10.09 dB.

© 2009 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4510) Fiber optics and optical communications : Optical communications
(130.3120) Integrated optics : Integrated optics devices
(200.4560) Optics in computing : Optical data processing
(230.2090) Optical devices : Electro-optical devices

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: February 9, 2009
Revised Manuscript: March 25, 2009
Manuscript Accepted: March 27, 2009
Published: April 27, 2009

Ivan B. Djordjevic, Lei Xu, and Ting Wang, "Optical LDPC decoders for beyond 100 Gbits/s optical transmission," Opt. Lett. 34, 1420-1422 (2009)

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