偏振无关的全光纤窄带通梳状滤波器  

Polarization-Independent All-fiber Narrow Bandpass Comb Filter

作　　者：马秀荣[1] 吴志芳[1] 刘艳格[1] 开桂云[1] 袁树忠[1] 董孝义[1] 

机构地区：[1]南开大学现代光学研究所

出　　处：《光电子．激光》2004年第8期885-887,共3页Journal of Optoelectronics·Laser

基　　金：国家"973"计划资助项目(2003CB314906);天津市重点基金资助项目(043800911)

摘　　要：提出了一种基于二阶高双折射光纤(HBF)Sagnac环Sagnac环镜的全光纤窄带通梳状滤波器。二阶HBFSagnac环镜由单环构成,环中包含2段HBF。对照由2个一阶HBFSagnac环镜级联实现的窄带通梳状滤波器,进行了理论推导和试验证明。结果表明,当二阶HBFSagnac环镜中的2段HBF的长度设定为L1∶L2=1∶2,入射光与HBF快轴间的夹角为θ1+θ3=45°、θ2=45°时,实现了类似于2个一阶HBFSagnac环镜级联的传输谱,具有窄带通和宽信道间隔的特点。与对照的方案相比,边模抑制比高出3dB,此外还具有插入损耗低、实现简单等优点。理论推导与实验结果吻合。A polarization-independent all-fiber narrow bandpass comb filter was demonstrated based on a second-order high birefringent fiber (HBF) Sagnac loops. The filter is made up of a single loop, which contains two sections of HBF. Comparing with the conventional cascade Sagnac loops filters in the same parameter, the related simulations and experiments have been made. We find when the two section of HBF length rate L1:L2=l:2, the angles between the input light and the HBF fast axis θ1+θ2=90° and θ2=45°, the filter has a narrow bandpass and a large channel spacing type, which is similar to the two cascaded Sagnac filter, but the extinction ratio is greater 3 dB. Otherwise the proposed device is of simpler structure and lower insertion loss. A good agreement is achieved between the numerical simulation and the experimental result.

关 键 词：带通 SAGNAC环 梳状滤波器 窄带 偏振无关 级联 光纤 二阶 单环 类似 

分 类 号：TN929.11[电子电信—通信与信息系统] TN713[电子电信—信息与通信工程]