论文部分内容阅读
基于广义非线性薛定谔方程,利用分步傅里叶法数值模拟了超高斯时间分布的飞秒脉冲在光子晶体光纤中的传输特性。结果表明:超高斯脉冲比高斯脉冲在更短距离内形成孤子衰变,而且出现比强孤子功率稍低的次峰,孤子自频移更显著;另外,三阶色散会导致脉冲波形及频谱不对称,出现精细结构,并且有形成孤子的趋势;脉冲内拉曼散射对脉冲有平滑作用;自陡改变了主峰与次峰之间的能量分配。
Based on the generalized nonlinear Schrödinger equation, the propagation characteristics of femtosecond pulses with super-Gaussian time distribution in photonic crystal fiber are numerically simulated by the step-Fourier method. The results show that the super-Gaussian pulse forms soliton decay in a shorter distance than the Gaussian pulse, and the sub-peak appears slightly lower than the strong soliton. The soliton shifts more significantly from frequency to frequency. In addition, the third-order dispersion will lead to pulse waveform and spectrum asymmetry , There is fine structure, and there is a tendency to form solitons; pulsed Raman scattering has a smooth effect on the pulse; steep changes the energy distribution between the main peak and the second peak.