基于光纤环形镜的偏振无关的掺镧锆钛酸铅电光开关

利用掺镧锆钛酸铅(PLZT)陶瓷二次电光效应结合光纤环形镜结构的优势构成偏振无关高速电光开关。采用琼斯矩阵方法分析了光纤环形镜的输出特性,给出了开关消光比同器件结构参量之间的关系。测量掺镧锆钛酸铅电光开关具有输入偏振无关特性,光开关消光比达到25 dB,响应时间小于3μs。此外利用此开关装置测量获得了实验用掺镧锆钛酸铅陶瓷的克尔系数为κ~1.1×10-16m2/V2。理论分析和实验结果表明,利用环形镜结构稳定优势和掺镧锆钛酸铅优良的电光特性结合设计的高速光开关具有良好的应前景。本工作对掺镧锆钛酸铅电光材料的应用推广和高速光开光研究提供了有益的理论和实验参考。

Polarization Independent Lanthanum-Doped Lead Zirconium Titanate Electro-Optical Switch Based on Fiber Loop Mirror

A polarization independent high speed electro-optical switch by using quadratic electro-optic effect of lanthanum-doped lead zirconium titanate (PLZT) ceramic incorporated in a Sagnac loop is described. Analysis by Jones matrix method shows the output property of the fiber loop mirror and the relation of its extinction ratio and parameters of the configuration. Experiments show its typical performances of 25 dB extinction ratio and less than 3 μs response time, and give Kerr coefficient of the lanthanum-doped lead zirconium titanate κ～1.1×10-16 m2/V2. Experiments also show good stability of the device without any special measures, which is attributed to the mutual optical paths in the fiber loop for the two beams of interferometer, and is regarded superior than other structures like Mach-Zehnder interferometer.