光孤子传输演化的分步傅里叶法研究

Study on the split-step Fourier transform method in soliton evolution

光孤子传输的数值仿真研究对其实用化及系统设计具有重要意义。本文详细介绍了分步傅里叶法的基本原理和仿真步骤,并用M atlab语言对光孤子在光纤中的传输演化进行了仿真。讨论了光纤损耗对光孤子传输的影响,并说明当光孤子对在光纤中传播时,距离太近将会产生强烈的相互作用,导致孤子形状发生畸变。最后对掺铒光纤放大器对孤子能量补偿作用做了探讨,指出光孤子通信中主要是色散受限,采用980 nm光源泵浦的EDFA具有较好的效果。

The split-step Fourier transform method （SSFM） and its simulation process are presented in detail. Matlab was used to simulate the soliton propagation in the optical fiber. The influence of optical fiber attenuation on soliton propagation is discussed. It is pointed out that two optical solitons will strongly affect each other if they are very close, which makes the soliton shape aberrant. The EDFA was adopted to compensate the power of the soliton and its result was reviewed. It is concluded that dispersion is the major limitation in the optical soliton communication, 980 nm laser is selected to pump the EDFA to obtain better result.