H Yun, Y Wang, F Zhang, Z Lu, S Lin, L Chrostowski… - Optics Letters, 2016 - europepmc.org
We report on a compact, broadband, 2× 2 adiabatic 3 dB coupler using sub-wavelength
gratings (SWGs) for silicon-on-insulator waveguides. In our device, two SWG waveguides …