前、后向多抽运光纤喇曼放大器的增益特性分析

摘要

In order to study gain characteristics of forward and backward multi-pumped Raman amplifiers,based on the power propagation equations of multi-pumped Raman fiber amplifiers, the pumped power and signal power along the fiber was calculated combining Ronge-Kuta with shoot calculation method.The calculation results showed that in the forward pumped fiber amplifiers,the signal power was amplified at first because of the interaction between the pumped light,then reduced fast after the peak value,and that in the backward pumped fiber amplifiers,the signal power reduced gradually at first,then increased fast at the end of the fiber.The result is an important reference for the design of the Raman fiber amplifiers.%为了研究前向、后向多抽运光纤喇曼放大器的增益特性,在受激喇曼散射功率耦合方程组的基础上,采用龙格-库塔法结合打靶法分别计算了前、后向抽运功率、信号功率沿光纤的演化过程,并给出了抽运功率和信号功率的计算结果.结果表明,前向抽运系统中信号开始被放大,在最大处开始快速减小.低频抽运光的功率开始被放大的原因是由于抽运光之间的非线性相互作用引起的.后向抽运时信号开始被缓慢减小,然后在距离光纤末端处快速增加.这为以后喇曼光纤放大器的设计提供了重要的参考.