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Effects of walk-off on cross-phase modulation induced modulation instability in an optical fibre with high-order dispersion
Authors:Zhong Xian-Qiong and Xiang An-Ping
Institution:Department of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China
Abstract:This paper investigates the effects of walk-off among optical pulses on cross-phase modulation induced modulation instability in the normal dispersion region of an optical fibre with high-order dispersion. The results indicate that, in the case of high-order dispersion, the walk-off effect takes on new characteristics and will influence considerably the shape, position and especially the number of the spectral regions of the gain spectra of modulation instability. Not only the group-velocity mismatch, but also the difference of the third-order dispersion of two optical waves will alter the gain spectra of modulation instability but in different ways. Depending on the values of the walk-off parameters, the number of the spectral regions may increase from two to at most four, and the spectral shape and position may change too.
Keywords:modulation instability  cross-phase modulation  walk-off effect  the difference ofthe third-order dispersion
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