Abstract
We show that dual-wavelength-band (DWB) subwavelength grating couplers (SWGCs) can be designed for simultaneous coupling of the near-infrared and extended shortwave-infrared (SWIR) fundamental transverse electric polarized light at the same diffraction angle. Numerical simulations predict coupling efficiencies (CEs) larger than 34% for the DWB SWGCs operating in the S/C band (1.48/1.55μm) and extended SWIR band (1.8-2.8μm) with a widely and continuously tailorable peak wavelength separation between 250 and 1250nm. The fabricated DWB SWGCs with peak wavelengths of (1.56, 2.255)μm and (1.487, 2.331)μm respectively obtain CEs of (20.2, 25.8)% and (20.6, 26.9)%, 1-dB bandwidths of 38nm and 54nm at a diffraction angle of 2°.
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