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利用打靶法对单波长双向抽运拉曼光纤放大器的开关增益问题进行了数值仿真研究,结果表明,在小信号的情况下,只要抽运光的总功率不变,信号光的开关增益几乎与正反向抽运光功率的分配比例无关,此结果和小信号情况下的解析解结论一致。当信号光功率增大到对抽运光的消耗不能忽略时,其开关增益随着正向抽运光功率百分比的增大而略有增大。另外,也给出了几种不同输入信号入纤光功率、不同正反向抽运光功率分配情况下的信号光、正反向抽运光和总光功率沿光纤长度的分布。
The numerical simulation of the switching gain problem of a single-wavelength bi-directional pumping Raman fiber amplifier is presented. The results show that the switching gain of the signal light is almost the same as The proportion of pump power in both positive and negative directions has nothing to do with the results of analytic solution in the case of small signal. When the signal light power is increased to the pumping light consumption can not be ignored, the switching gain increases slightly with the increase of the percentage of positive pumping light power. In addition, the distributions of signal light, forward and reverse pump light and total optical power along the length of the fiber under different input optical power and different forward and backward pumping power distributions are also given.