基于切趾取样光栅单信道直流平衡技术的光栅滤波器  

Fiber Grating Filter Based on One Channel DC-Free Design of Apodized Sampling Grating Filter

作　　者：陈鹏[1] 王荣[1] 蒲涛[1] 卢麟[1] 方涛[1] 朱英勋[1] 郑吉林[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《光学学报》2009年第8期2071-2076,共6页Acta Optica Sinica

基　　金：国家自然科学基金(60502003)资助课题

摘　　要：提出了一种利用取样光栅周期的啁啾平衡切趾取样光栅单信道内直流分量的方法,基于该方法的切趾光栅滤波器具有波长设计灵活不受限于模板周期和只需一次曝光过程、亚微米量级制作精度的优点。利用均匀光栅最大反射率测量模型和零点带宽测量模型得到了实验所使用的载氢光纤紫外光致折射率变化量与曝光时间的关系。在此基础上,利用提出的新方法设计并实验制作了中心反射波长为1549.84 nm,3 dB带宽分别为75 pm和55 pm的两根升余弦切趾光栅滤波器,实验制作与理论设计仿真结果非常接近,成功消除了取样光栅-1级子光栅谱短波长方向处的法布里-珀罗共振现象,得到的光栅滤波器反射谱和透射谱具有良好的对称性,反射谱边带抑制度在20 dB以上。The chirp of sampling period is applied for balancing one channel＇s DC component of apodized sampling grating. This method has the advantages that wavelength design is flexible and unrestricted to phase mask period, and just a single exposure and a sub-micrometer precision are needed. Maximum reflectivity model and reflectivity notch bandwidth model of uniform grating are used to obtain the relation between UV photo-induced index increment of single mode hydrogen loading fiber and its dose. Based on this method, cosine apodized grating filters with central wavelength of 1549.84 nm, 3 dB bandwidth of 75 pm and 55 pm respectively, are fabricated. The results indicate that experimental and simulation data are coincided well, F-P resonance in high frequency side and the unbalance of -1^st reflection and transmittance spectrum are totally eliminated, and the suppression of reflection sidelobes is beyond 20 dB.

关 键 词：光纤光学 光纤布拉格光栅 切趾取样光栅 光栅滤波器 直流 

分 类 号：TN25[电子电信—物理电子学]