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从掺镱(Yb)光纤放大器的功率传输方程出发,利用有限差分法对小模场面积(SMA)和大模场面积(LMA)掺镱双包层光纤放大器的放大特性进行了分析比较.采用模场直径(MFD)6.5μm和20μm的双包层掺镱光纤作为放大器增益介质进行窄线宽连续信号的放大,在915 nm激光抽运下模拟计算了大、小模场面积输出功率随输入信号功率、抽运光功率和光纤长度的变化特性,特别是对于大模场面积光纤放大器,最优光纤长度的选择至关重要;讨论了模场直径不同时的最优抽运功率和光纤长度的选择,得出4 m光纤放大时的临界抽运功率为4 W,理论与实验结果基本一致.为实际应用中根据信号光、抽运光、增益和模式等要求而选择光纤长度和类型等优化设计提供了理论依据.
Based on the power transfer equation of ytterbium-doped (Yb) fiber amplifier, the amplifying characteristics of small mode field area (SMA) and large mode area area (LMA) ytterbium doped double-clad fiber amplifier were analyzed and compared by finite difference method. Modeled field diameter (MFD) 6.5μm and 20μm double-clad ytterbium-doped fiber as the amplifier gain medium for narrow-line continuous signal amplification, the 915 nm laser pumping simulation of large and small mode field area output power with the input Signal power, pump power and fiber length variation characteristics, especially for the large-mode-area fiber amplifier, the optimal choice of fiber length is crucial; discusses the mode field diameter of the optimal pumping power and fiber length , The critical pumping power at 4 m optical fiber amplification is 4 W, and the theoretical and experimental results are basically the same. For practical applications, the fiber length and type are selected according to the requirements of signal light, pump light, gain and mode Optimized design provides a theoretical basis.