双通道三端口反射式光环行器 结构与特性分析

为了降低广泛应用于光通信系统的光环行器的制造成本和占空比，增强系统中各器件的功能复用，提出一种功能复用反射式光环行器设计方案，利用透镜和反射镜组成光的空间交叉功能来实现功能复用以及光束方向传输引导，从而达到反射式光环行器输入 输出多尾纤之间的对应耦合。利用琼斯矩阵，从理论上对其主要性能进行了分析。分析结果表明，设计的光环行器在功能复用基础上具有低插入损耗、高隔离等特性，达到了光环行器的性能指标，在低插入损耗、高隔离的基础上具有功能复用效用。

Structure and characteristics of double-channel reflecting optical circulator

By adopting double-tail fiber, lens and flat reflector, an innovative scheme, which uses a double-channel reflecting optical circulator and duplicates the function in comparison with conventional optical circulator with single-fiber tip, is proposed. Typical insertion loss and isolation of the developed reflective circulator are the same as those of the conventional optical circulator. With Jones matrix, the main performances of the reflective circulator are analyzed theoretically. The result shows that the insertion loss may be reduced with antireflective film, the isolation capability depends on the extinction ratio of the crystal it uses, and the performance index of the reflective circulator can meet the requirement of application. In comparison with the conventional circulator, its cost is lower and the volume is smaller.