Abstract

A transverse-electric-mode focusing subwavelength grating coupler (FSWGC) is proposed and demonstrated for dual-wavelength-band (DWB) coupling from a single-mode fiber into a suspended-membrane waveguide for the first time, to the best of our knowledge. Location and separation of the two coupling peaks can be flexibly tailored based on a proposed design methodology. As a proof of concept, two DWB FSWGCs working at (1486.0, 1594.5) nm and (1481.5, 1661.5) nm are experimentally demonstrated with coupling efficiencies of (18.3%, 20.1%) and (14.5%, 17.5%), 3-dB bandwidths of (55.0, 30.5) nm and (44.0, >39.5) nm, respectively. A DWB FSWGC working at (1480, 1830) nm with a wavelength separation of 350 nm and coupling efficiencies of (38.0%, 33.2%) is also numerically predicted.

© 2018 Optical Society of America

Dual-wavelength-band subwavelength grating coupler operating in the near infrared and extended shortwave infrared

Wen Zhou and Hon Ki Tsang
Opt. Lett. 44(15) 3621-3624 (2019)

Single-step etched two-dimensional polarization splitting dual-band grating coupler for wavelength (de)multiplexing

Guanglian Cheng, Qiyuan Yi, Qiyuan Li, Zhiwei Yan, Fanglu Xu, Yongchao Zou, Ting Li, Yi Zou, Yu Yu, and Li Shen
Opt. Lett. 47(15) 3924-3927 (2022)

Focusing subwavelength grating coupler for mid-infrared suspended membrane germanium waveguides

Jian Kang, Zhenzhou Cheng, Wen Zhou, Ting-Hui Xiao, Kimmy-Laure Gopalakrisna, Mitsuru Takenaka, Hon Ki Tsang, and Keisuke Goda
Opt. Lett. 42(11) 2094-2097 (2017)

Subwavelength-grating contradirectional couplers for large stopband filters

Dominique Charron, Jonathan St-Yves, Omid Jafari, Sophie LaRochelle, and Wei Shi
Opt. Lett. 43(4) 895-898 (2018)

Focusing subwavelength grating coupler for mid-infrared suspended membrane waveguide

Zhenzhou Cheng, Xia Chen, C. Y. Wong, Ke Xu, Christy K. Y. Fung, Y. M. Chen, and Hon Ki Tsang
Opt. Lett. 37(7) 1217-1219 (2012)