基于级联啁啾亚波长光栅辅助反向耦合器的超宽带可调滤波器  

Ultra-Broadband Tunable Filter Based on Cascaded Chirped Subwavelength Grating Assisted Contra-Directional Coupler

作　　者：廖莎莎 包航 冯玉婷 黄琮 张伍浩 赵帅 刘真伟 Liao Shasha;Bao Hang;Feng Yuting;Huang Cong;Zhang Wuhao;Zhao Shuai;Liu Zhenwei(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海200240

出　　处：《光学学报》2022年第14期19-25,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61801063);重庆市自然科学基金面上项目(cstc2019jcyj-msxmX0597);上海交通大学区域光纤通信网与新型光通信系统国家重点实验室开放基金(2021GZKF005)。

摘　　要：宽带、可调滤波器被认为是突破信息处理技术瓶颈的关键器件之一,可以有效提升信息网络的传输容量和频谱效率。提出了一种基于级联啁啾亚波长光栅辅助反向耦合器的超宽带可调滤波器。该滤波器采用绝缘体上硅材料,通过在反向耦合器中使用亚波长光栅和引入啁啾实现超宽带滤波,通过级联反向耦合器实现带宽可调。分析了反向耦合器的传输函数,提出了提高器件带宽的方法。采用单个反向耦合器结构可以实现带宽为64.07 nm,旁瓣抑制比大于10.5 dB,插入损耗约为0.60 dB的超宽带滤波器。通过级联该结构,可实现插入损耗为1 dB,带宽调节范围为44.30~48.92 nm的宽带可调滤波器。该宽带可调滤波器具有超大带宽、可调谐、矩形度高、尺寸小和可实现无中断传输等优势,能被广泛应用于光滤波和信息传输等领域中。The broadband tunable filter is considered as one of the key equipment to break the bottleneck of the information processing technology,which can effectively improve the transmission capacity and spectrum efficiency of information networks.An ultra-broadband tunable filter based on cascaded chirped subwavelength grating assisted contradirectional coupler is proposed.The filter is based on silicon on insulator.By using subwavelength grating and introducing chirp in the contra-directional coupler,an ultra-broadband filter is obtained.The bandwidth tunability of the proposed filter is realized by cascading contra-directional couplers.The transmission function of the contra-directional coupler is analyzed,and some feasible methods to enlarge the bandwidth of the filter are proposed.The ultra-broadband filter with a bandwidth of 64.07 nm,a sidelobe suppression ratio of more than 10.5 dB and insertion loss of about 0.60 dB can be realized by using a single contra-directional coupler.The ultra-broadband tunable filter with an insertion loss of 1 dB and a bandwidth tuning range of 44.3-49.92 nm can be realized by cascading contra-directional couplers.The ultra-broadband tunable filter has the advantages of large bandwidth,tunability,high similarity with rectangular shape,small size,and uninterrupted transmission,which can be widely used in optical filtering and information transmission.

关 键 词：光栅 集成光学器件 光滤波器 亚波长光栅 

分 类 号：TN256[电子电信—物理电子学]