Liu Yili, Liu Kai, Yang Yifeng, Liu Meizhong, He Bing, Zhou Jun
Opt Express. 2021 Apr 26;29(9):13344-13358. doi: 10.1364/OE.422549.
We report on two high power backward (6 + 1) × 1 pump and signal combiners with different optical designs based on end-pumping technique, each achieving more than 95% coupling ratio of signal light, 98% coupling ratio of pump light, and a total pump power of 2.95kW. Both designs solve the problem of non-uniform arrangement in asymmetric fiber bundles by the pretreatment of the pump fibers and signal fiber. Asymmetric fiber bundle in backward pump and signal combiners means the pump input fibers and signal output fiber have different cladding diameters. Two 3D simulation models were built to calculate the parameters of the fused fiber bundles for matching the mode field diameter between the signal input and the output fibers. Both optical designs of backward combiners were developed based on the beam propagation method and confirmed by experimental results.
我们报告了两种基于端泵浦技术、具有不同光学设计的高功率后向（6 + 1）×1泵浦与信号合束器，每种合束器的信号光耦合比均超过95%，泵浦光耦合比为98%，总泵浦功率为2.95kW。两种设计都通过对泵浦光纤和信号光纤进行预处理，解决了非对称光纤束中排列不均匀的问题。后向泵浦与信号合束器中的非对称光纤束是指泵浦输入光纤和信号输出光纤的包层直径不同。建立了两个三维模拟模型来计算熔接光纤束的参数，以匹配信号输入光纤和输出光纤之间的模场直径。后向合束器的两种光学设计均基于光束传播法开发，并得到了实验结果的证实。
