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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 21,
  • Issue 10,
  • pp. 2438-
  • (2003)

Spectral Efficiency of Coded Phase-Shift Keying for Fiber-Optic Communication

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Abstract

Several optical modulation and detection schemes are compared by computing their spectral efficiencies over additive white Gaussian noise channels. The bandwidth savings of differential quadrature phase-shift keying (D-QPSK) over both direct-detection on-off keying and differential binary phase-shift keying suggest that D-QPSK can improve the reach and efficiency of wavelength-division multiplexing systems. To test the theory, Reed-Solomon and low-density parity-check forward error correction codes are designed and evaluated. The codes generally behave as expected, except that for D-QPSK the gains are hampered by the differential detector. It is further shown that neither multiple-symbol differential detection nor decision-feedback detection is attractive when using strong codes.

© 2003 IEEE

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