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Analysis of degenerate four-wave-mixing noise in return-to-zero optical transmission systems including walk-off

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1 Author(s)
Kumar, S. ; Electr. & Comput. Eng., McMaster Univ., Hamilton, Ont., Canada

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.

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Lightwave Technology, Journal of  (Volume:23 ,  Issue: 1 )