The effect of cross-phase modulation (CPM) on the soliton switching in fiber nonlinear couplers is analyzed by studying the evolution of the soliton parameters at different values of the ratio sigma between the CPM and self-phase modulation contributions. It is shown that the CPM effect may sufficiently modify the switching characteristics, and perfect switching is always achieved for sigma ? 1 when the model becomes exactly integrable. The main conclusions of the present analysis are confirmed by numerical simulations.
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Kivshar et al. (1993) studied this question.
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