Fully-Etched Grating Coupler with Low Back Reflection
Publication Type:Journal Article
Source:Proc. SPIE, Photonics North 2013, Volume 8915, p.89150U (2013)
A fully-etched grating coupler with improved back reflection and bandwidth is demonstrated in this paper. It can also be made in compact patterns with much smaller footprints than conventional, fully-etched grating couplers with long adiabatic tapers. Sub-wavelength gratings were employed to form the effective index areas between the major gratings. Our grating has a measured 3-dB bandwidth of 64.37 nm with a back reflection of -14 dB.