Title :
Analysis of degenerate four-wave-mixing noise in return-to-zero optical transmission systems including walk-off
Author_Institution :
Electr. & Comput. Eng., McMaster Univ., Hamilton, Ont., Canada
Abstract :
A noise theory for four-wave-mixing (FWM) tone generated by nonlinear interaction of channels of a wavelength-division-multiplexed system is described. Analytical expressions for power spectral density and variance of FWM noise are derived without ignoring group-velocity walk-off between channels. The results show that the variance of FWM noise exhibits sharp minima and maxima as a function of channel separation which is due to the coherent interaction between channels. When the walk-off distance is large or comparable to effective fiber length, FWM penalty can be reduced by introducing a suitable initial delay between interacting channels.
Keywords :
multiwave mixing; optical fibre communication; optical modulation; optical noise; telecommunication channels; wavelength division multiplexing; FWM noise variance; channel interaction; degenerate four-wave mixing noise; group-velocity walk-off; power spectral density; return-to-zero optical transmission systems; wavelength-division-multiplexed system channel; Analysis of variance; Fiber nonlinear optics; Frequency; Noise generators; Nonlinear optics; Optical crosstalk; Optical fiber communication; Optical mixing; Optical noise; Optical signal processing; Four-wave mixing (FWM); nonlinear fiber optics; optical communication;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2004.835742
