Low-complexity BCH codes with optimized interleavers for DQPSK systems with laser phase noise

Miu Yoong Leong, Knud J. Larsen, Gunnar Jacobsen, Darko Zibar

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    The presence of high phase noise in addition to additive white Gaussian noise in coherent optical systems affects the performance of forward error correction (FEC) schemes. In this paper, we propose a simple scheme for such systems, using block interleavers and binary Bose–Chaudhuri–Hocquenghem (BCH) codes. The block interleavers are specifically optimized for differential quadrature phase shift keying modulation. We propose a method for selecting BCH codes that, together with the interleavers, achieve a target post-FEC bit error rate (BER). This combination of interleavers and BCHcodes has very low implementation complexity. In addition, our approach is straightforward, requiring only short pre-FEC simulations to parameterize a model, based on which we select codes analytically. We aim to correct a pre-FEC BER of around 10−3. We evaluate the accuracy of our approach using numerical simulations. For a target post-FEC BER of 10−6, codes selected using our method result in BERs around 3× target and achieve the target with around 0.2 dB extra signal-to-noise ratio.
    Original languageEnglish
    JournalPhotonic Network Communications
    Issue number3
    Pages (from-to)328-333
    Number of pages6
    Publication statusPublished - 2017


    • Optical fiber communications
    • Error correction codes
    • Block codes
    • Phase noise
    • Cycle slips


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