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Spectral density enhancement using coherent WDM

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2 Author(s)
Ellis, Andrew D. ; Photonic Syst. Group, Univ. Coll. Cork, Ireland ; Gunning, F.C.G.

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 2 )