Ultra-Broadband Subwavelength Grating Coupler for Bound State in Continuum

IEEE Photonics Journal

Xiaohan Sun¹  Zhaofu Chen²  Junjia Wang²  Na Dong²  Chongbao Fang³  Weifeng Jiang³  Lawrence R. Chen³ 

[1] College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China;National Research Center for Optical Sensors&x002F;communications Integrated Networks, School of Electronic Science and Engineering, Southeast University, Nanjing, Jiangsu, China;

关键词: Subwavelength structures;    gratings;    bound state in continuum;    waveguide devices;   

DOI  :  10.1109/JPHOT.2022.3178882

来源: DOAJ

【 摘 要 】

Grating couplers (GCs) are important for light to couple between optical fibers and photonic integrated circuits (PICs). The Bound State in Continuum (BIC) waveguides offer new functionalities for PIC. High-Q resonators, electro-optical modulator, and photodetectors can be built on it without etching steps. Due to the special waveguide geometry of BIC waveguides, a high efficiency GC is still missing. In this work, we demonstrated a subwavelength grating (SWG) GC for BIC waveguide with a coupling efficiency of 8 dB and a 1 dB bandwidth >70 nm. The device shows ultra-broadband behavior which is extremely useful for BIC-based PICs.

【 授权许可】

Unknown