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本文基于多横模运转的传输速率方程,建立了多芯光子晶体光纤放大器的数值模型.利用分步傅里叶方法,分析了掺杂浓度分布、耦合强度、抽运功率对于放大器各模式输出功率的影响.通过对多芯光子晶体光纤掺杂浓度的阶梯设计和纤芯间耦合强度的优化,实现了无需插入其他外加元件,利用光纤本身特性就可以实现选定同相位超模的方法,并且数值计算表明高抽运功率也能够提高放大器输出同相位超模的比例,进一步优化了多芯光子晶体光纤放大器输出脉冲的光束质量.
In this paper, the numerical model of multi-core photonic crystal fiber amplifier is established based on the transfer rate equation of multi-transverse mode operation.The doping concentration distribution, coupling strength and pumping power are analyzed using the split-step Fourier method. By means of the step design of the doping concentration of multi-core photonic crystal fiber and the optimization of the coupling strength between the cores, a method of selecting selected in-phase supermodes can be realized without inserting other additional components and utilizing the characteristics of the optical fiber itself, and Numerical calculations show that the high pumping power can also increase the ratio of the amplifier output to the phase supermodule and further optimize the beam quality of the output pulse of the multi-core photonic crystal fiber amplifier.