Spectral density enhancement using coherent WDM

Andrew D. Ellis, Fatima C. Garcia Gunning

Research output: Contribution to journalArticlepeer-review


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 power crosstalk, and appropriate strategies are discussed in this letter. Index Terms-Filtering, optical communication terminals, phase control, wavelength-division multiplexing (WDM).
Original languageEnglish
Pages (from-to)504-506
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number2
Publication statusPublished - Feb 2005


  • spectral density
  • wavelength-division-multiplexing
  • single polarization


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