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Spectral efficiency of coded phase-shift keying for fiber-optic communication

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4 Author(s)
Kramer, G. ; Lucent Technol. Bell Labs., Murray Hill, NJ, USA ; Ashikhmin, A. ; van Wijngaarden, A.J. ; Xing Wei

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.

Published in:

Lightwave Technology, Journal of  (Volume:21 ,  Issue: 10 )

Date of Publication:

Oct. 2003

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