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, Yasuhiro Aoki

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)19042-19049
Number of pages8
JournalOptics Express
Volume19
Issue number20
DOIs
StatePublished - Sep 26 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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