基于级联复合光栅的窄带平顶型滤波器设计  

Design of Narrow-Band Flat-Top Filter Based on Cascaded Compound Gratings

作　　者：余九州 刘秀红 包益宁 任丹萍[1] 胡劲华[1] 赵继军[1] Yu Jiuzhou;Liu Xiuhong;Bao Yining;Ren Danping;Hu Jinhua;Zhao Jijun(School of Information&,Electrical Engineering,Hebei University of Engineering,Handan,Hebei 056038,China;School of Mathematics&Physics,Hebei University of Engineering,Handan,Hebei 056038,China)

机构地区：[1]河北工程大学信息与电气工程学院,河北邯郸056038 [2]河北工程大学数理科学与工程学院,河北邯郸056038

出　　处：《光学学报》2021年第20期1-6,共6页Acta Optica Sinica

基　　金：国家自然科学基金(61905060);河北省自然科学基金(F2019402063,F2019402240,F2018402198,A2020402013);河北省高等学校科学技术研究项目重点项目(ZD2021019)。

摘　　要：导模共振光栅作为一种重要的滤波单元,在光通信中有着广泛的应用。然而,普通的导模共振光栅的传输光谱为洛伦兹型,该类结构在高性能光纤通信系统中的应用受到限制。采用级联导模共振光栅可以实现平顶滤波响应,但是整个器件的体积较大,制作工艺复杂。此外,单一复合光栅结构难以直接实现窄带平顶滤波响应。提出了一种级联双层复合光栅结构以解决这一问题,利用严格耦合波算法和本征模式分析法分析了其输出光谱。仿真结果表明该滤波器的中心波长为1549.9 nm,其平顶光谱的线宽为0.5 nm。As key filtering elements, guided-mode resonance(GMR) gratings have wide applications in optical communication. However, the transmission spectrum of a conventional GMR grating shows Lorentzian-type response, which limits the further application of GMR gratings in high-performance optical communication systems. Cascaded GMR gratings have been presented to realize flat-top filtering response, but the entire device has a large size and the fabrication process is complicated. In addition, it is difficult to achieve narrow-band flat-top filtering response with only a single-layer compound GMR grating. Hence, a cascaded double-layer compound grating is proposed to solve the problem in this work. The output spectra are analyzed by a combination of rigorous coupled wave analysis and eigenmode analysis, and the results show that the central wavelength of the filter is 1549.9 nm, and the line width of the flat-top spectrum is 0.5 nm.

关 键 词：衍射 波长滤波器 导模共振 严格耦合波分析 平顶光谱 复合光栅 

分 类 号：TN256[电子电信—物理电子学]