Ultra-Broadband Subwavelength Grating Coupler for Bound State in Continuum

Junjia Wang; Chongbao Fang; Na Dong; Weifeng Jiang; Zhaofu Chen; Lawrence R. Chen; Xiaohan Sun

doi:10.1109/JPHOT.2022.3178882

IEEE Photonics Journal (Jan 2022)

Ultra-Broadband Subwavelength Grating Coupler for Bound State in Continuum

Junjia Wang,
Chongbao Fang,
Na Dong,
Weifeng Jiang,
Zhaofu Chen,
Lawrence R. Chen,
Xiaohan Sun

Affiliations

Junjia Wang: ORCiD; National Research Center for Optical Sensors/communications Integrated Networks, School of Electronic Science and Engineering, Southeast University, Nanjing, Jiangsu, China
Chongbao Fang: National Research Center for Optical Sensors/communications Integrated Networks, School of Electronic Science and Engineering, Southeast University, Nanjing, Jiangsu, China
Na Dong: National Research Center for Optical Sensors/communications Integrated Networks, School of Electronic Science and Engineering, Southeast University, Nanjing, Jiangsu, China
Weifeng Jiang: ORCiD; College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China
Zhaofu Chen: ORCiD; National Research Center for Optical Sensors/communications Integrated Networks, School of Electronic Science and Engineering, Southeast University, Nanjing, Jiangsu, China
Lawrence R. Chen: ORCiD; Department of Electrical and Computer Engineering, McGill University, Montreal, QC, Canada
Xiaohan Sun: ORCiD; National Research Center for Optical Sensors/communications Integrated Networks, School of Electronic Science and Engineering, Southeast University, Nanjing, Jiangsu, China

DOI: https://doi.org/10.1109/JPHOT.2022.3178882
Journal volume & issue: Vol. 14, no. 4
pp. 1 – 4

Abstract

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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.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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