采用分步的傅立叶方法数值求解了一维的耦合非线性薛定鄂方程, 模拟了超短光脉冲在双芯光子晶体光纤中的非线性传输和孤子开关现象的产生。分析了泵浦脉冲的脉宽、入射峰值功率对孤子开关现象的影响。研究表明：当泵浦激光的入射峰值功率低于孤子开关的阈值功率时, 能量转换效率很高; 当泵浦激光的入射峰值功率超过孤子开关的阈值功率时, 孤子发生了明显的分裂现象, 产生了多个频率成分, 孤子开关现象逐渐消失。此外, 也研究了双脉冲在双芯光子晶体光纤中的非线性传输特性, 研究表明：入射峰值功率和脉冲延迟对孤子的分裂和能量转移有重用影响。

Using a standard split-step Fourier algorithm, the one–dimensional coupled nonlinear Schr?dinger equations have been numerically solved. A theoretical investigation on the ultrashort pulse nonlinear propagation and the soliton switching generation in a dual-core photonic crystal fiber are presented. The impact of pulse width and input peak power of the pump pulse on the soliton switching is simulated and analyzed. It is found the efficiency of soliton switching is very higher when the input peak power of the pump pulse is below the switching threshold of solitons. At a higher input peak power, the soliton splitting appears and multi-frequencies are generated and thus the soliton switching disappears gradually. In addition, the nonlinear copropagation of two optical pulses in a dual-core photonic crystal fiber is also presented. It is found both the input peak power and the pulse delay have an important effects on the soliton splitting and energy exchange.