Ultrahigh rejection microring resonator assisted by an all-pass filter  

作　　者：Ming Chen Yifan Liu Kaixiang Cao Yuan Yu Fangzheng Zhang Xinliang Zhang 

机构地区：[1]Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics,and School of Optical and Electronic Information,Wuhan,China [2]Optics Valley Laboratory,Wuhan,China [3]Nanjing University of Aeronautics and Astronautics,National Key Laboratory of Microwave Photonics,Nanjing,China

出　　处：《Advanced Photonics Nexus》2024年第6期98-105,共8页先进光子学通讯(英文)

基　　金：supported by the National Key Research and Development Program of China(Grant No.2018YFA0704403);the National Natural Science Foundation of China(Grant No.61975249);the Program for HUST Academic Frontier Youth Team(Grant No.2018QYTD08);the Project of Key Laboratory of Radar Imaging and Microwave Photonics(Nanjing University of Aeronautics and Astronautics),Ministry of Education(Grant No.NJ20230001);the Independent Innovation Foundation of HUST(Grant No.5003187117).

摘　　要：The microring resonator(MRR)plays an important role in signal processing because high-quality bandpass filtering can be obtained at its drop port.To promote the signal-to-noise ratio,a high rejection ratio is significantly demanded.However,it is still challenging to promote the rejection ratio of the MRR-based bandpass filter.To solve this problem,we propose to use an all-pass filter to enhance the rejection ratio of the MRR-based bandpass filter.Experimental results show that the improved rejection ratio is as high as 47.7 dB,which is improved by 23.6 dB compared with that of the MRR.Meanwhile,the bandwidth of the MRR-based bandpass filter is reduced from 2.61 to 1.14 GHz due to the constructive interference in the passband.In addition,the center frequency of this ultrahigh rejection MRR can be continuously tuned from 6.26 to 46.25 GHz.The quality factor(Q)of the MRR is improved from 7.4×10^(4) to 1.7×10^(5).During the adjustment,the rejection ratio of the bandpass filter exceeds 40 dB.The proposed approach can be used to achieve optical bandpass filters with high performance.

关 键 词：microring resonator all-pass filter high rejection ratio 

分 类 号：TN7[电子电信—电路与系统]