色散缓变光纤中孤子的相互作用

Interaction Between Solitons in Dispersion-decreasing Fiber

以非线性薛定谔方程为理论依据,应用对称傅立叶变换,采用MATLAB编程,对色散缓变光纤(DDF)中孤子间相互作用进行了理论模拟,并与普通光纤进行了比较。研究发现,当孤子间初始间距q0=3时,DDF中孤子间无相互作用,而普通光纤中存在强相互作用;DDF中直到q0=2时孤子间才出现明显的相互作用。结果表明,DDF中的传输比特率比普通光纤中的大;改变两孤子的初始相对相位或振幅,可以减小孤子间的相互作用。

By non-linear Schrdinger equation,soliton interaction in decreasing-dispersion fiber(DDF) was simulated using split-step Fourier transformation and Matlab program.The results are compared with the soliton interaction in common fiber.When the initial time interval q_0=3,no interaction between solitons in DDF,but there is a strong interaction in common fiber.Till q_0=2,the significant interaction occurs in DDF.This results shows that the transportation bit rate is greater in DDF than in common fiber.For DDF or common fiber,by changing the initial relative phase or amplitude,the soliton interaction can be decreased.