Tunable narrow-band single-channel add-drop integrated optical filter with ultrawide FSR  

作　　者：Chunlei Sun Yuexin Yin Zequn Chen Yuting Ye Ye Luo Hui Ma Lichun Wang Maoliang Wei Jialing Jian Renjie Tang Hao Dai Jianghong Wu Junying Li Daming Zhang Hongtao Lin Lan Li 

机构地区：[1]Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province,School of Engineering,Westlake University,Hangzhou 310024,China [2]Institute of Advanced Technology,Westlake Institute for Advanced Study,Hangzhou 310024,China [3]State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,2699 Qianjin Street,Changchun 130012,China [4]Key Laboratory of Micro-Nano Electronics and Smart System of Zhejiang Province,College of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027,China [5]School of Microelectronics,Zhejiang University,Hangzhou 310027,China.

出　　处：《PhotoniX》2022年第1期312-323,共12页智汇光学（英文）

基　　金：National Key Research and Development Program of China(2019YFB2203003);National Natural Science Foundation of China(62175202 and 91950204);Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang(2020R01005);the Open Research program of Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province;Westlake University(the start-up fund of Westlake University).

摘　　要：Free-spectral-range(FSR)-free optical filters have always been a critical challenge for photonic integrated circuits.A high-performance FSR-free filter is highly desired for communication,spectroscopy,and sensing applications.Despite significant progress in integrated optical filters,the FSR-free filter with a tunable narrow-band,high out-of-band rejection,and large fabrication tolerance has rarely been demonstrated.In this paper,we propose an exact and robust design method for add-drop filters(ADFs)with an FSR-free operation capability,a sub-nanometer optical bandwidth,and a high out-of-band rejection(OBR)ratio.The achieved filter has a 3-dB bandwidth of<0.5 nm and an OBR ratio of 21.5 dB within a large waveband of 220 nm,which to the best of our knowledge,is the largest-FSR ADF demonstrated on a silicon photonic platform.The filter exhibits large tunability of 12.3 nm with a heating efficiency of 97 pm/mW and maintains the FSR-free feature in the whole tuning process.In addition,we fabri-cated a series of ADFs with different periods,which all showed reliable and excellent performances.

关 键 词：Integrated devices Silicon photonics Optical filters FSR-free filters Tunable filters 

分 类 号：TN713[电子电信—电路与系统]