多模光纤放大器输出光分析
Analysis of signal in multimode fiber amplifier
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摘要: 根据不同的泵浦方式，对多模光纤放大器运用多模速率方程组，采用四阶龙格-库塔法数值计算和分析了在不同泵浦方式下的泵浦效率和信号光在光纤放大器中的传输、放大行为，并研究了在光纤放大器光纤长度有微小变化(mm量级)的情况下，输出光的光束质量与光纤长度的关系。结果表明：输出信号光的光束质量因子随光纤长度微小变化而呈准周期变化，周期与信号光耦合入光纤放大器的本征模式间的传播常数差有关。Abstract: Through the fourth order Runge-Kutta formulas, the multimode rate equations, tailored to accommodate different pumping methods, are employed to evaluate the pumping efficiency and the signal power in the multimode fiber amplifier. The effect of the tiny change of fiber length (about millimeter level) on the output beam quality is studied. The beam quality factor varies quasi-periodically with the tiny change of fiber length. And the period is dependent on the propagation constant difference between the eigen modes of the amplifier.
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Key words:
- fiber optics /
- beam quality /
- eigen modes /
- multimode rate equation /
- fourth order runge-kutta method /
- pumping method
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