同向抽运光纤拉曼放大器增益分析方法比较

Comparison of Gain Analysis Method of Forward Pumped Fibre Raman Amplifier

系统地研究了同向抽运光纤拉曼放大器的增益特性,并对分析增益的数值模拟和求解析解2种方法进行了比较.采用龙格库塔法的算法对增益进行数值仿真,分析了所有参量在小信号和大信号时对增益的影响.将数值仿真结果与解析解进行比较,结果发现小信号时两者结果一致,且解析解的方法更简单;大信号时,数值模拟的方法更适合分析光纤拉曼放大器的性能.

In order to analyze the gain characteristics of forward-pumped fibre Raman amplifier（FRA）, comparison of two analysis methods both numeric simulation and analytical method is presented. At first, numeric simulation of the coupling equations of FRA was provided with Runge-Kutta method, and the effects of all parameters on gain of the amplifier were investigated in detail. Then, based on the study before, numeric simulation method was compared with analytical analysis. It is discovered that： they are similar to each other under small signal, and analytical method is sim- pler; but numeric simulation is more adaptable to apply in characteristics analysis under big signal.