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利用变分方法，导出了双曲正割型光孤子在非线性光纤耦合器中传输时满足的动力学方程组，分析了该方程组的平衡点性态，讨论了光孤子的开关特性．指出参数卜Ｋ２。是能实现完全的开关操作的必要条件．
The variational method is used to derive the dynamic equations satisfied by the transmission of hyperbolic secant optical solitons in the nonlinear optical fiber coupler. The equilibrium states of the system are analyzed, and the switching characteristics of optical solitons are discussed. Indicate the parameters BU K2. It is a necessary condition to achieve full switching operation.