为了对反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,采用龙格库塔算法和打靶法相结合的数值模拟方法,详细分析所有物理因素对反向抽运光纤拉曼放大器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增加而增加,当增加到最大值时保持数值不变;功率转换效率随着初始信号光功率、光纤拉曼增益系数、信号光损耗系数增加而增加,随着光纤有效面积、抽运光损耗系数、抽运光与信号光的频率比增加而减小;功率转换效率和初始抽运光功率呈抛物线曲线关系.所得结论对反向抽运光纤拉曼放大器功率转换效率的进一步研究以及光纤拉曼放大器的其他相关研究有重要参考意义.

In order to analyze the power conversion efficiency of backward pumped fibre Raman amplifier(FRA),by combining the shooting method with the Runge-Kutta method for solving differential coupling equations of backward pumped FRA,the effect of every parameter on backward pumped FRA's power conversion efficiency was detailedly investigated.It is found that the power conversion efficiency is increasing with the increase of fibre length,until it reaches the maximum;the power conversion efficiency increases when the initial signal power or Raman gain coefficient or the attenuation coefficient of signal is larger,and it decreases when the fibre efficient area or the attenuation coefficient of pump or the pump and signal frequency ratio is larger;the relation between power conversion efficiency and initial pump power is para-curve.The conclusions are helpful to,further study the backward pumped FRA.