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现有的光纤耦合器在作为分波器使用时具有较低的插入损耗,在作为合波器时插入损耗较大,为实现低损耗合波目的,提出一种由单模与多模光纤共同构成的混合型光纤耦合器。利用耦合波方程理论分析其工作原理,计算机模拟其耦合过程。采用熔锥法制作工艺,完成单模与多模光纤耦合器的制作,实验结果与理论模拟相吻合;该器件单模到多模光纤的耦合效率、多模到多模光纤的耦合效率均在90%以上,实现了两路光束的功率合波。作为低插入损耗合波器件可广泛应用于光通信以及双包层光纤激光器抽运光的注入。
The existing fiber coupler has lower insertion loss when used as a demultiplexer and larger insertion loss when used as a combiner. In order to achieve low-loss multiplexing, a single-mode and multi-mode optical fiber is proposed Composition of the hybrid fiber coupler. Using coupled wave equation theory to analyze its working principle, the computer simulation of the coupling process. The fabrication process of the single-mode and multimode fiber couplers is completed by the melt-taper method. The experimental results are consistent with the theoretical simulation. The coupling efficiency of the single-mode to multimode fiber and the coupling efficiency of multimode to multi- More than 90%, to achieve the power of two beams combined. As a low insertion loss multiplexing device can be widely used in optical communications and double-clad fiber laser pumping light injection.