Tailorable dual-wavelength-band coupling in a transverse-electric-mode focusing subwavelength grating coupler
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AbstractA 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.
All Author(s) ListZhou W, Cheng ZZ, Sun XK, Tsang HK
Journal nameOptics Letters
Volume Number43
Issue Number12
Pages2985 - 2988
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesOptics;Optics

Last updated on 2021-04-03 at 23:27