多段双折射光纤构成环镜滤波器的滤波特性  

Filtering Characteristics of Fiber Loop Mirror Filter Composed of Multi-Stage High Birefringent Fibers

作　　者：周广[1] 赵启大[1] 刘艳格[1] 开桂云[1] 董孝义[1] 

机构地区：[1]南开大学现代光学研究所,天津300071

出　　处：《光学学报》2004年第3期341-345,共5页Acta Optica Sinica

基　　金：国家自然科学基金 (6 99770 0 6 );教育部博士点基金(2 0 0 2 0 0 5 5 0 36 );天津自然科学基金(0 1380 0 5 11)资助课题

摘　　要：讨论了多段双折射光纤构成环镜滤波器的滤波特性。从理论上得到了N段双折射光纤构成环镜滤波器滤波特性的结果 ;具体给出了N为 1、2和 3时的具体表达式 ;分析了所构成的环镜滤波器的偏振无关特性 ;讨论了双折射光纤的长度、拍长、双折射光纤之间夹角等因素对滤波器滤波特性的影响 ;最后 ,做了相关的实验验证 ,所得到的实验结果和理论模拟结果非常吻合 ,证实了理论的正确性。基于多段双折射光纤构造的滤波器 ,稳定性优于一般的全光纤马赫曾德尔干涉仪型滤波器 ,具有结构简单 ,灵活性强 ,偏振无关 ,插入损耗小和成本低等优点 ,在光纤传感解调 ,调谐光纤激光器和光纤通信滤波器等领域具有巨大的应用前景。The filtering characteristics of the fiber loop mirror filter, which is composed of multi stage high birefringent fibers (HBF) is studied. The theoretic transfer function of the filter made of N stage HBFs, and the expression are obtained when N is 1, 2 or 3; the polarization independence of the filter is analyzed, and the relation between the frequency response and the parameter of filter such as the length, beat length of HBFs and the angles between HBFs is studied; finally, some experiments are performed to check the theory, and the result shows to have good agreement with the theoretic result. The filter, which is based on N stage HBFs loop mirror, has better stability than all fiber Mach Zehnder filter, is flexible in application, and has the advantages such as polarization independence, low insertion loss and low cost, so it has potential application in the fields of demodulation of fiber sensor, tunable filber laser and fiber filter of optic communcatiion.

关 键 词：波导光学 双折射光纤 环镜滤波器 偏振状态 插入损耗 坐标系旋转变换 透过率函数 

分 类 号：TN713[电子电信—电路与系统] TN253