为了对同向抽运光纤拉曼放大器的功率转换效率进行研究,由耦合方程出发, 理论推导出功率转换效率的解析解,采用数值计算的方法详细分析不同物理因素对功率 转换效率的影响。结果表明:功率转换效率先随着光纤长度和单位面积的拉曼增益系数增加而 增加,当增加到最大值时保持数值不变;小信号时,初始信号光功率对功率转换效率的影响较小;大 信号时,功率转换效率随着初始信号光功率增加而快速增加;功率转换效率和初始抽运光功率呈抛物 线曲线关系;抽运光与信号光的频率比增加时,功率转换效率减小。

In order to analyze power conversion efficiency of forward pumped fibre Raman amplifier(FRA), by the solving differential coupling equations, the theoretical expression of power conversion efficiency was presented. The effect of different parameters on forward pumped FRA’s power conversion efficiency was detailedly investigated. It was found that power conversion efficiency will increase when the fibre length or Raman gain coefficient per unit area increase, until it has reached the maximum. Initial signal power has a little influence on power conversion efficiency when it is small, and power conversion efficiency increases quickly when initial signal power is larger. The relation between power conversion efficiency and initial pump power is para-curve. Power conversion efficiency decreases when the frequency rate of pump and signal is larger.