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针对大模场双包层光纤在光纤输出隔离器中的应用,根据模式传输理论分析了单模激光在多模光纤中的传输特性。多模光纤与单模光纤无偏心的连接,经单模光纤传输的光在多模光纤中激发出一系列相互叠加的LPon模。利用有限差分光束传播法(FD-BPM)分析波长为1 064nm时双包层光纤的模式传输,利用耦合模扩散理论分析了包层中模场和纤芯中模场的相互影响。结果表明:因为包层模的存在,光纤输出隔离器的性能受到影响,插入损耗增加36%。
According to the application of large mode field double-clad fiber in optical fiber output isolator, the transmission characteristics of single-mode laser in multimode fiber are analyzed based on the mode transmission theory. Multi-mode fiber and single-mode fiber without eccentric connection, the light transmitted through the single-mode fiber in the multi-mode fiber to stimulate a series of superimposed LPon mode. The finite-difference beam propagation method (FD-BPM) was used to analyze the mode transmission of double-clad fiber with a wavelength of 1 064nm. The interaction between the mode field and the mode field in the core was analyzed by coupled mode diffusion theory. The results show that the performance of the optical fiber output isolator is affected by the existence of the cladding mode and the insertion loss is increased by 36%.