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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 23,
  • Issue 1,
  • pp. 108-
  • (2005)

1.14 b/s/Hz Spectrally Efficient 50 x 85.4-Gb/s Transmission Over 300 km Using Copolarized RZ-DQPSK Signals

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Abstract

1.14 b/s/Hz spectrally efficient 50 x 85.4-Gb/s copolarized return-to-zero differential quaternary phase-shift keying (RZ-DQPSK) signals have been transmitted over 300 km of nonzero dispersion-shifted fiber (NZ-DSF), using optical prefiltering and conventional C-band erbium-doped fiber amplifier (EDFA) repeaters. In this study, in order to enhance the spectral efficiency,the impact of optical prefiltering on the RZ-DQPSK signal was experimentally investigated in comparison to the DQPSK signal, and we found that the RZ-DQPSK signal had better sensitivity with almost the same nonlinear tolerance than the DQPSK signal even with 65-GHz bandwidth optical prefiltering.

© 2005 IEEE

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