激光与光电子学进展, 2018, 55 (11): 112302, 网络出版: 2019-08-14
2×4集成结构90°空间光学桥接器 
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2×4 Free-Space 90° Optical Hybrid with Integrated Structure
光学器件 相干光通信 90°光学桥接器; 双折射 双反射 电光效应 optical devices coherent optical communication 90° optical hybrid; double refraction double reflection electro-optic effect
摘要
利用晶体的双折射、双反射现象及电光效应,设计了一种具有集成结构的2×4的90°空间光学桥接器,其由一块电控双折射晶体和一块检偏双折射晶体构成。电控双折射晶体通过4次全内双反射和电光调制实现信号光与本振光的分束和耦合,通过调节电控双折射晶体的控制电压和检偏双折射晶体的双折射效应,输出了4路具有90°相移的信号光与本振光混合光束。该桥接器具有结构简单紧凑、损耗小、性能稳定等优点,适用于空间相干通信系统。
Abstract
Based on the double refraction and double reflection phenomena and on the electro-optic effect of crystals, a 2×4 free-space 90° optical hybrid with an integrated structure is designed. This optical hybrid is composed of an electrically controlled birefringence crystal and a birefringence crystal which is used as an analyzer. With the electrically controlled birefringence crystal, the splitting and coupling between the signal light and the local oscillation light are realized by means of four internal double reflections and the electro-optic modulation. By adjusting the control voltage of the electrically controlled birefringence crystal and the double refraction effect of the analyzer, four-route signal-local mixed lights with a 90° phase shift are obtained. This hybrid exhibits the advantages of simple and compact structure, low loss and stable performance, which is applicable to the spatial coherence communication system.
宋哲, 于伟行, 宋佳, 王妍, 田小凡, 赵趣, 王安鸽. 2×4集成结构90°空间光学桥接器[J]. 激光与光电子学进展, 2018, 55(11): 112302. Zhe Song, Weihang Yu, Jia Song, Yan Wang, Xiaofan Tian, Qu Zhao, Ange Wang. 2×4 Free-Space 90° Optical Hybrid with Integrated Structure[J]. Laser & Optoelectronics Progress, 2018, 55(11): 112302.
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