On-chip ultra-high rejection and narrow bandwidth filter based on coherency-broken cascaded cladding-modulated gratings  

作　　者：JINZHAO WANG TING LI YANG FENG JIEWEN LI WANXIN LI LUWEI DING YONG YAO JIANAN DUAN WEI LIU FENG HE YI ZOU XIAOCHUAN XU 

机构地区：[1]Guangdong Provincial Key Laboratory of Integrated Photonic-Electronic Chip,Guangdong Provincial Key Laboratory of Aerospace Communication and Networking Technology,Harbin Institute of Technology,Shenzhen,Shenzhen 518055,China [2]School of Information Science and Technology,ShanghaiTech University,Shanghai 201210,China

出　　处：《Photonics Research》2024年第5期979-985,共7页光子学研究（英文版）

基　　金：Basic and Applied Basic Research Foundation of Guangdong Province(2020B1515130006,2021B515120056,2023A1515011944);Science,Technology and Innovation Commission of Shenzhen Municipality(JCYJ20210324131614040,JCYJ20220531095604009);National Natural Science Foundation of China(U22A2093)。

摘　　要：Bragg filters are of essential importance for chip-scale photonic systems.However,the implementation of filters with sub-nanometer bandwidth and rejection beyond 70 dB is hindered by the high index contrast of the siliconon-insulator platform,which makes filters prone to fabrication imperfections.In this paper,we propose to combine coherency-broken cascading architecture and cladding modulation to circumvent the intrinsic limitation.The cascading architecture effectively prevents the accumulation of phase errors,while the cladding modulation offers additional design freedom to reduce the coupling coefficient.A bimodal Bragg filter with a testingequipment-limited rejection level of 74 dB and a 40 dB bandwidth of 0.44 nm is experimentally demonstrated.The minimum feature size is 90 nm,which significantly relieves the fabrication constraints.

关 键 词：FILTER CLADDING narrow 

分 类 号：TN713[电子电信—电路与系统]