一种由非平面3×3单模光纤耦合器构成的可调分束比2×2单模光纤耦合器

AN ADJUSTABLE 2×2 FIBER COUPLER USING NONPLANER 3×3 FIBER COUPLER

介绍一种可调分束比２×２单模光纤耦合器。该耦合器由一个非平面３×３单模光纤耦合器将其中一对输入榆出端用反馈光纤连接，通过调节反馈光纤的长度来调节另外两输出端的输出光功率比，而成为一个２×２可调分束比单模光纤耦合器。对这一结构所进行的理论分析给出了在给定３×３耦合器特性情况下，分束比与反馈光纤长度之间的关系。数值计算给出了这一调节关系曲线，同时对这一结构进行了初步的实验分析，制成了带无接点反馈光纤环路的非平面３×３耦合器。通过ＰＺＴ调节反馈光纤环路的长度，达到了对两输出端光功率比的调节。实验结果与理论计算的结果基本一致。

n adjustable 2×2 single-mode fiber coupler was presented.In a noaplaner 3×3 single-mode fiber coupler, it joined an input port to another output port with a feedback fiber, hereafter regulated the output power ratios of the other output pods by adjusting the length of feedback fiber and obtained an adjustable 2×2 single-mode fiber. The relation between the ratio of beam division and the length of feedback fiber was showed by analzing this configuration theoretially on condition that the property of the 3×3 norplaner coupler calculation. In the meantime, a basic experimental analysis on configuration was given and was produce a nonplaner 3×3 fiber coupler with a nonconnection-point feedback fiber loop.To adjust the ratios of the output powers PZT was used to modulate the length of the feedbadr loop. Theoritical results were shown to be in good agreement with experimental results.