Soliton collisions in birefringent optical fibers have been investigated numerically. It is found that soliton collisions can be divided into three kinds of behavior depending on the value of the linear birefringence. Both soliton mixing and soliton center-frequency shifts have been studied in detail. A new kind of soliton state has been found. The Čerenkov emission generated by soliton collision has also been found numerically.
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