Mitigation of Linear and Nonlinear Impairments in High-Speed Optical Networks by using LDPC-Coded Turbo Equalization

Ivan B Djordjevic, Lyubomir L. Minkov, Hussam G. Batshon

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

We study a turbo equalization scheme based on low-density parity-check (LDPC) coded turbo equalization (TE). This scheme is suitable for simultaneous: (i) suppression of intrachannel nonlinearities, (ii) chromatic dispersion compensation, and (iii) polarization-mode dispersion (PMD) compensation. LDPC coding is based on large girth (g > 8) block-circulant codes, and maximum a posteriori probability (MAP) equalizer is based on Bahl-Cocke-Jelinek-Raviv (BJCR) algorithm. The ultimate channel capacity limits, assuming an independent identically distributed (i.i.d.) source are reported as well. In the presence of intrachannel nonlinearities the LDPC-coded TE provides almost 12 dB improvement over BCJR equalizer at BER of 10-8. For an NRZ system operating at 10 Gb/s with residual dispersion of 11200 ps/nm and for differential group delay of 50 ps, the LDPC-coded TE is only 1 dB away from the i.i.d channel capacity. The efficiency of LDPC-coded TE in PMD compensation is demonstrated experimentally, with decoding performed off line.

Original languageEnglish (US)
Pages (from-to)73-83
Number of pages11
JournalIEEE Journal on Selected Areas in Communications
Volume26
Issue number6
DOIs
StatePublished - 2008

Fingerprint

Dispersion compensation
Fiber optic networks
Polarization mode dispersion
Channel capacity
Equalizers
Chromatic dispersion
Group delay
Block codes
Decoding

Keywords

  • chromatic dispersion
  • Fiber-optics communications
  • intra-channel nonlinearities
  • low-density parity-check (LDPC) codes
  • polarization-mode dispersion (PMD)
  • turbo equalization

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Cite this

Mitigation of Linear and Nonlinear Impairments in High-Speed Optical Networks by using LDPC-Coded Turbo Equalization. / Djordjevic, Ivan B; Minkov, Lyubomir L.; Batshon, Hussam G.

In: IEEE Journal on Selected Areas in Communications, Vol. 26, No. 6, 2008, p. 73-83.

Research output: Contribution to journalArticle

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