建立了复折射率纤芯结合有限差分束传播法的双包层稀土掺杂光纤抽运吸收效率数值模型,利用该模型对几种常用内包层外边界结构下双包层稀土掺杂光纤的抽运吸收系数进行了详细的分析,得出相应双包层光纤的抽运吸收特性.分析结果对双包层稀土掺杂光纤的优化设计具有重要的指导意义.
In this paper, a pump laser absorption model for double cladding rare earth doped optical fiber is established by using the finite difference beam propagation method combined with complex refractive index profile, and the absorption properties are analyzed in detail for some typical inner cladding structures by using this model. The results can be used to design the double cladding rare earth doped optical fiber.