补偿光纤的参数对自相似脉冲压缩效应的影响

从非线性薛定谔（NLS）方程出发，用数值方法研究了在自相似脉冲压缩技术中反常色散补偿光纤的群速度色散参量(GVD参量)和非线性参量对脉冲压缩效应的影响。结果表明，补偿光纤的GVD参量对压缩因子和脉冲峰值功率的影响是周期性的，随着GVD参量数值的增大，脉冲能量按集中-分散-集中的规律周期性变化，且变化周期逐渐增大，一周期内的能量转移加剧；每次能量集中时，脉宽接近压缩极限。最佳光纤长度随着GVD参量数值的增加而下降，但不受非线性参量的影响。另一方面，非线性参量的增大会降低压缩因子，不利于脉冲压缩。通过优化选择补偿光纤参数，能够接近脉宽压缩极限，提高脉冲压缩质量。

Effects of compensative fiber’s parameters on self-similar pulse compression

The pulse compression is affected by group-velocity dispersion parameter (GVD parameter) and nonlinear parameter of the anomalous-dispersion compensative fiber, which is used in self-similar pulse compression technique. This effect was studied with numerical calculation based on nonlinear Schrodinger (NLS) equation. The results show that compensative fiber’s GVD parameters affect compression factor and peak power of compressed pulse periodically. Pulse energy concentrates, then disperses, and then concentrates in every period. As the magnitude of GVD parameter increases, period interval becomes longer and more energy diverts. Every time when energy concentrates, the pulse width approaches the compression limit. Optimal fiber length is a decreasing function of the magnitude of GVD parameter, but it has nothing to do with nonlinear parameter. On the other hand, the increase of nonlinear parameter reduces compression factor, which is bad for pulse compression. By optimizing the parameters of the compensative fiber, pulse width can attain its limit and high quality pulse is obtained.