Title :
Spectral density enhancement using coherent WDM
Author :
Ellis, Andrew D. ; Gunning, Fatima C Garcia
Author_Institution :
Photonic Syst. Group, Univ. Coll. Cork, Ireland
Abstract :
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.
Keywords :
optical crosstalk; optical fibre communication; optical filters; optical modulation; telecommunication channels; wavelength division multiplexing; 40 Gbit/s; WDM channels; coherent WDM; coherent comb source; nonreturn-to-zero WDM; optical filter optimization; power crosstalk minimization; spectral density; wavelength division multiplexing; Crosstalk; Demultiplexing; Interference; Optical control; Optical filters; Optical modulation; Optical receivers; Optical transmitters; Polarization; Wavelength division multiplexing; Filtering; optical communication terminals; phase control; wavelength-division multiplexing (WDM);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.839393
