光子晶体光纤中孤子内拉曼散射的研究

利用快速分步傅里叶方法数值计算了孤子在光子晶体光纤中的传输。计算结果表明:光子晶体光纤中会产生较强的拉曼散射,非线性越强,孤子分裂得越快,同时分裂出更多孤子。而且,初始啁啾对光子晶体光纤中的拉曼散射有较大的影响,正初始啁啾会增大拉曼孤子的红移速度,而负初始啁啾则会减小拉曼孤子的红移速度。随着光子晶体光纤非线性加强,初始啁啾的作用减弱。

Study of Intrapulse Stimulated Raman Scattering in the Nonlinear Photonic Crystal Fiber

By means of the split-step Fourier method, the propagation of solitons in a photonic crystal fiber (PCF) is numerically simulated. The results show that, the PCF can generate relatively strong intrapulse stimulated Raman scattering (ISRS), and, the higher the nonlinearity, the faster the speed of soliton fission, hence the greater the number of solitons produced at the same time. Besides, the initial chirp has a stronger influence on the ISRS in the PCF as well. A positive initial chirp can increase the red shift speed of the Raman solitons, while a negative initial chirp can work contrarily. Further more, the higher the nonlinearity of the PCF, the weaker the effect of the initial chirp.