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.
Received: 18 September 2006
Revised: 06 November 2006
Accepted manuscript online:
Fund: Project supported by the Fundamental Application Research Project of the
Department of Science {\&} Technology of Sichuan Province (Grant
Nos~05JY029-084 and 04JY029-103), the Key Program of Natural Science Foundation of
Educational Commission of Sichuan Province (Grant No 2006A124), and the
Foundation of Science {\&} Technology Development of Chengdu University of
Information Technology (Grant No KYTZ20060604).
Cite this article:
Zhong Xian-Qiong(钟先琼) and Xiang An-Ping(向安平) Effects of walk-off on cross-phase modulation induced modulation instability in an optical fibre with high-order dispersion 2007 Chinese Physics 16 1683
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