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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 24,
  • Issue 1,
  • pp. 420-
  • (2006)

Multilevel Coding in M-ary DPSK/Differential QAM High-Speed Optical Transmission With Direct Detection

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Abstract

A bandwidth-and power-efficient modulation scheme using M-ary differential phase-shift keying (DPSK)/differential quadrature amplitude modulation (DQAM) and low-density parity-check (LDPC) codes as component codes in a multilevel coding (MLC) is proposed for optical transmission systems with direct detection. An MLC scheme with 2 b/s/Hz spectral efficiency based on block-circulant component codes provides the coding gain of 12.3 dB when compared to uncoded 8-DPSK, and 8.3 dB when compared to uncoded 4-DPSK (QDPSK).

© 2006 IEEE

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