Spectral density enhancement using coherent WDM

  title={Spectral density enhancement using coherent WDM},
  author={A. D. Ellis and F. C. G. Gunning},
  journal={IEEE Photonics Technology Letters},
It is shown by numerical simulations that a significant increase in the spectral density of a 40-Gb/s wavelength-division-multiplexing (WDM) system can be obtained by controlling the phase of adjacent WDM channels. These simulations are confirmed experimentally at 40 Gb/s using a coherent comb source. This technique allows the spectral density of a nonreturn-to-zero WDM system to be increased from 0.4 to 1 b/s/Hz in a single polarization. Optical filter optimization is required to minimize… CONTINUE READING
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