基于级联导模共振光栅的平顶光学滤波器设计  

Design of Flat-Top Optical Filter Based on Cascaded Guided Mode Resonant Gratings

作　　者：余九州 胡劲华[1] 任丹萍[1] 刘秀红 包益宁 赵继军[1] Yu Jiuzhou;Hu Jinhua;Ren Danping;Liu Xiuhong;Bao Yining;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：《激光与光电子学进展》2021年第11期67-72,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61905060);河北省自然科学基金(F2019402063,F2019402240,F2018402198,F2017402068,A2020402013);河北省高等学校科学技术研究项目重点项目(ZD2021019)。

摘　　要：基于导模共振光栅的集成光学滤波器在光纤通信中具有潜在的应用前景,然而单个导模共振光栅的输出光谱一般呈现洛伦兹线型,这会阻碍该类结构在波分复用系统中的应用。传统方法一般采用多个谐振腔级联的方式实现平顶滤波响应,然而整个结构的体积较大,制作工艺较为复杂,因此提出一种基于级联双层导模共振光栅结构,其输出光谱响应为平顶陡边型。首先建立器件的物理模型,其物理机理是将导模共振效应与法布里-珀罗谐振效应结合,然后利用物理模型分析和设计滤波器结构。研究发现该滤波器的中心波长为1550 nm,其3 dB带宽可以增加至20 nm。Integrated optical filters based on guided-mode resonant gratings have potential applications in optical fiber communications. However, the output spectrum of a single guided-mode resonant grating is generally Lorentzian, which hinders the use of this type of structure in wavelength division multiplexing systems. Traditional methods generally use multiple resonator cascades to achieve a flat-top filter response. However, the entire structure is considerably large and the manufacturing process is complicated. Therefore, based on the output spectral response, a cascaded double-layer guided-mode resonant gratings structure of the flat-top and steep-edge type is proposed in this study. First, the physical model of the device is established. The physical mechanism is to combine the guided mode resonance effect with the Fabry-Perot resonance effect, and then use the physical model to analyze and design the filter structure. The center wavelength of the filter is observed to be 1550 nm, and its 3 d B bandwidth can be increased to 20 nm.

关 键 词：光栅 波长滤波器 导模共振 法布里-珀罗谐振腔 平顶光谱 

分 类 号：TN256[电子电信—物理电子学]