单模光纤耦合器的偏振温度特性研究  

Polarization-temperature Characteristic of Single-mode Fiber Coupler

作　　者：杨学礼[1] 王学锋[1] 张蔚[1] 

机构地区：[1]中国航天时代电子公司,北京100854

出　　处：《光子学报》2009年第4期841-846,共6页Acta Photonica Sinica

基　　金：国防科工委基金资助

摘　　要：理论分析并研究了温度变化对单模光纤耦合器的偏振特性的影响.推导了单模光纤耦合器输出消光比与输入消光比、模式耦合率的关系表达式.利用多个偏振特性不同的光源,进行了在快速温度变化条件下单模耦合器输出消光比随温度变化的测试实验,证明了采用低偏振的光源有利于降低单模耦合器中因温度变化引起的模式耦合效应.最后仿真计算了在光源输出消光比不同的情况下模式耦合引起的光纤陀螺输出误差的大小,为不同环境应用的光纤陀螺选取合适的光源提供了参考.The polarization-temperature characteristic of single-mode （SM） fiber coupler was investigated theoretically and experimentally. An analytic expression shows that the factors affecting the extinction ratio （ER） of the output light of SM fiber coupler include the extinction ratio of the input light and the modecoupling ratio of the fibers is derived. Then a series of experiments on measuring the extinction ratio of the output light by changing temperature rapidly and using several light sources with different degree of polarization （DOG） were performed,and the above experimental results demonstrate that the light sources with low DOG are useful to reduce the mode coupling effect in SM fiber coupler caused by temperature change. Moreover,the output errors of fiber optic gyroscope （FOG） owing to the mode-coupling effect were calculated and simulated with changing the extinction ratios of light sources,which is helpful on how to choose suitable light sources for different FOG systems.

关 键 词：光纤陀螺 单模光纤耦合器 偏振 消光比 模式耦合 光源 

分 类 号：V241.5[航空宇航科学与技术—飞行器设计] TN253[电子电信—物理电子学]