电光调制2×490°相移空间光学桥接器  

A Free-Space 2×4 90° Optical Hybrid with Electro-Optic Modulation

作　　者：万玲玉[1] 周煜[2] 刘立人[2] 孙建锋[2] 

机构地区：[1]广西大学物理科学与工程技术学院,广西南宁530004 [2]中国科学院上海光学精密机械研究所空间激光通信及检验技术重点实验室,上海201800

出　　处：《光学学报》2012年第7期230-234,共5页Acta Optica Sinica

基　　金：国家自然科学基金(10964001);中国科学院空间激光通信及检验技术重点开放实验室资助课题

摘　　要：基于LiNbO3晶体的双折射和电光效应设计制作了一种2×4的90°相移自由空间光学桥接器。该桥接器利用晶体的双折射效应进行信号光和本振光的分光/耦合,电光效应引入相位调制,在给定电场条件下实现2×4 90°空间光学桥接器的功能。对空间光学桥接器进行了实验测量和分析。实验结果表明该桥接器性能良好,相位连续可调,相位误差可通过电压调制补偿,应用于相干接收系统。A free-space 2 ×490° optical hybrid with electro-optic modulation is designed and fabricated based on the birefringence effect and electro-optic effect of LiNbO3 crystal. It splits and recombines a signal beam and a local oscillator beam by birefringence effect, and the desired phase shift is introduced by electro-optic effect. It realizes the appropriate function of a 2×490° optical hybrid under given electric-field conditions. The performance of 2 ×490° optical hybrid is measured experimentally and analyzed. Experimental results show that the optical hybrid has good performance of phase modulation and the proposed 90°optical hybrid. Its phase shift output is tuned electrooptically and phase errors can be compensated by adjusting the applied electric field. It has potential applications in coherent receivers.

关 键 词：光学器件 相干探测 空间光学桥接器 双折射效应 电光效应 90°相移 

分 类 号：TN929.11[电子电信—通信与信息系统]