Interleavers and BCH codes for coherent DQPSK systems with laser phase noise

Miu Yoong Leong, Knud J. Larsen, Gunnar Jacobsen, Sergei Popov, Darko Zibar, Sergey Sergeyev

Research output: Contribution to journalArticlepeer-review


The relatively high phase noise of coherent optical systems poses unique challenges for forward error correction (FEC). In this letter, we propose a novel semianalytical method for selecting combinations of interleaver lengths and binary Bose-Chaudhuri-Hocquenghem (BCH) codes that meet a target post-FEC bit error rate (BER). Our method requires only short pre-FEC simulations, based on which we design interleavers and codes analytically. It is applicable to pre-FEC BER ∼10-3, and any post-FEC BER. In addition, we show that there is a tradeoff between code overhead and interleaver delay. Finally, for a target of 10-5, numerical simulations show that interleaver-code combinations selected using our method have post-FEC BER around 2× target. The target BER is achieved with 0.1 dB extra signal-to-noise ratio.

Original languageEnglish
Pages (from-to)685-688
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number7
Early online date23 Dec 2014
Publication statusPublished - 1 Apr 2015

Bibliographical note

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Funding: Vetenskapsrådet under Grant 0379801, in part by EPSRC UNLOC EP/J017582/1, and in part by FP7-PEOPLE-2012-IAPP (GRIFFON, 324391)


  • block codes
  • communication systems
  • error correction codes
  • optical fiber communications
  • phase noise


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