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

PhotoniX

Zequn Chen¹  Jianghong Wu¹  Renjie Tang¹  Yuexin Yin¹  Ye Luo¹  Yuting Ye¹  Chunlei Sun¹  Jialing Jian¹  Lan Li¹  Lichun Wang²  Maoliang Wei²  Hui Ma²  Junying Li²  Hao Dai²  Hongtao Lin²  Daming Zhang³ 

[1] Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University;Key Laboratory of Micro-Nano Electronics and Smart System of Zhejiang Province, College of Information Science and Electronic Engineering, Zhejiang University;State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University;

关键词: Integrated devices;    Silicon photonics;    Optical filters;    FSR-free filters;    Tunable filters;   

DOI  :  10.1186/s43074-022-00056-2

来源: DOAJ

【 摘 要 】

Abstract 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 fabricated a series of ADFs with different periods, which all showed reliable and excellent performances.

【 授权许可】

Unknown