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为解决传统拉曼放大器增益系数低和增益不平坦的问题,采用级联光子晶体光纤的设计方法设计了一种增益平坦的拉曼光纤放大器.采用受激拉曼散射效应的稳态分析理论,分析了光子晶体光纤的拉曼增益谱,建立了拉曼放大器的理论模型.通过解耦合方程,推导了实现增益平坦的约束条件,发现光纤长度和泵浦功率是影响拉曼光纤放大器增益平坦度的两个参数.仿真结果表明,在1 508~1 544nm的带宽范围内,实现了一个增益高达21dB,增益平坦度仅为0.14dB的光子晶体拉曼光纤放大器,可在光纤通信系统应用中发挥重要作用.
In order to solve the problem of low gain coefficient and uneven gain of traditional Raman amplifier, a flattened Raman fiber amplifier is designed by adopting the design method of cascaded photonic crystal fiber.Using the steady state theory of stimulated Raman scattering, The Raman gain spectrum of photonic crystal fiber is analyzed, and the theoretical model of Raman amplifier is established. By solving the coupling equation, the constraint of gain flatness is deduced. It is found that the fiber length and pump power are the factors affecting the gain flatness The simulation results show that a photonic crystal Raman fiber amplifier with a gain of 21dB and gain flatness of only 0.14dB can be achieved in the bandwidth of 1 508 ~ 1 544nm, which can be used in optical fiber communication system Important role.