Iterative Polar Quantization-Based Modulation to Achieve Channel Capacity in Ultrahigh-Speed Optical Communication Systems

Hussam G. Batshon, Ivan B Djordjevic, Lei Xu, Ting Wang

Research output: Contribution to journalArticle

40 Scopus citations


In this paper, we propose a nonuniform coded-modulation format based on iterative polar quantization (IPQ) as a scheme to enable achieving channel capacity in ultrahigh-speed optical communication systems. The proposed modulation format is coded with structured low-density parity-check (LDPC) codes optimized for Gaussian channels and, in combination with polarization-multiplexing, can achieve 800 Gb/s per wavelength aggregate rate and beyond utilizing the currently available components operating at 50 GS/s. Using coded IPQ, we show that we can achieve capacity for signal-to-noise ratios (SNRs) of up to 25 dB and increase the total propagation distance over optical transmission systems by 275 km over coded star-quadrature amplitude modulation (QAM).

Original languageEnglish (US)
Pages (from-to)593-599
Number of pages7
JournalIEEE Photonics Journal
Issue number4
Publication statusPublished - 2010



  • Coded modulation
  • coherent communications
  • fiber optics and optical communications
  • forward error correction
  • iterative polar quantization (IPQ)
  • low-density parity-check (LDPC) codes
  • modulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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