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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 16 — Jul. 30, 2012
  • pp: 18336–18347

45 Gb/s low complexity optical front-end for soft-decision LDPC decoders

Meer Nazmus Sakib, Monireh Moayedi, Warren J. Gross, and Odile Liboiron-Ladouceur  »View Author Affiliations

Optics Express, Vol. 20, Issue 16, pp. 18336-18347 (2012)

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In this paper a low complexity and energy efficient 45 Gb/s soft-decision optical front-end to be used with soft-decision low-density parity-check (LDPC) decoders is demonstrated. The results show that the optical front-end exhibits a net coding gain of 7.06 and 9.62 dB for post forward error correction bit error rate of 10−7 and 10−12 for long block length LDPC(32768,26803) code. The performance over a hard decision front-end is 1.9 dB for this code. It is shown that the soft-decision circuit can also be used as a 2-bit flash type analog-to-digital converter (ADC), in conjunction with equalization schemes. At bit rate of 15 Gb/s using RS(255,239), LDPC(672,336), (672, 504), (672, 588), and (1440, 1344) used with a 6-tap finite impulse response (FIR) equalizer will result in optical power savings of 3, 5, 7, 9.5 and 10.5 dB, respectively. The 2-bit flash ADC consumes only 2.71 W at 32 GSamples/s. At 45 GSamples/s the power consumption is estimated to be 4.95 W.

© 2012 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2330) Fiber optics and optical communications : Fiber optics communications

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 9, 2012
Revised Manuscript: July 19, 2012
Manuscript Accepted: July 21, 2012
Published: July 26, 2012

Meer Nazmus Sakib, Monireh Moayedi, Warren J. Gross, and Odile Liboiron-Ladouceur, "45 Gb/s low complexity optical front-end for soft-decision LDPC decoders," Opt. Express 20, 18336-18347 (2012)

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