Using LDPC-coded modulation and coherent detection for ultra highspeed optical transmission

Ivan B. Djordjevic, Milorad Cvijetic, Lei Xu, Ting Wang

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


We propose the coded modulation schemes for ultrahigh-speed transmission (100 Gb/s and above) by using commercially available components operating at 40 gigasymbols/s. The bit-interleaved coded modulation in combination with the low-density parity-check codes that are used as component codes has been applied. The modulation is based on either M-ary quadrature-amplitude modulation or M-ary phase-shift keying. Log2M bits are mapped into the corresponding signal constellation point using either Gray or natural mapping. The coherent detection scheme has been found to outperform the direct detection one and to provide an additional margin much needed for longer transmission distances or for application in an all-optical network scenario.

Original languageEnglish (US)
Pages (from-to)3619-3625
Number of pages7
JournalJournal of Lightwave Technology
Issue number11
StatePublished - Nov 2007


  • Bit-interleaved coded modulation (BICM)
  • Coherent detection
  • Low-density parity-check (LDPC) codes
  • Optical communications

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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