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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。
A one-dimensional coupled nonlinear Schrödinger equation was solved numerically using a step-by-step Fourier method to simulate the nonlinear transmission and soliton switching of ultrashort optical pulses in a dual-core photonic crystal fiber. The influence of the pulse width of the pump pulse and the incident peak power on the phenomenon of the soliton switch is analyzed. The results show that the energy conversion efficiency is high when the incident peak power of the pump laser is lower than the threshold power of the soliton switch, and the soliton splits obviously when the incident peak power of the pump laser exceeds the threshold power of the soliton switch. Produced a number of frequency components, soliton switch phenomenon gradually disappear. In addition, the nonlinear transmission characteristics of double pulses in a dual-core photonic crystal fiber are also studied. The results show that the incident peak power and pulse delay have a reusable effect on the splitting and energy transfer of the soliton.