自喇曼散射及二阶色散系数对三阶飞秒孤子的影响

Effect of Self Raman Scatter and Second Order Dispersion Coefficient on the Third Order Femetosecond Soliton

介绍了分步傅里叶数值方法的原理和步骤。通过数值模拟,得到随着自喇曼散射系数的增大,三阶飞秒孤子分裂的两个孤峰,左峰的超前越来越小,而右峰的延迟越来越大。从频谱上看,开始蓝移随着自喇曼散射系数的增大而增大,当增大到一定程度时,两边的频谱会中移。增加二阶色散系数,三阶飞秒孤子的裂化也会得到控制,在频域内表现为频谱中移变窄。

The principle and process of the split-step Fourier method （SSFM） is introduced. Via numerical simulation, the simulation results show that the hastening of the left soliton of the two solitons splitting from a third order soliton will become more and more slowly and the delay of the right will become greater. We can see from the spectrum that blue shift will become bigger along with the self Raman coefficient hastening, and when it reaches a certain value, the both sides frequency elements will come back to the center. The split of third order soliton will be controlled when the second order dispersion coefficient becomes bigger. The spectrum become narrow in the frequency field.