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Fully-Etched Grating Coupler with Low Back Reflection

Publication Type:

Journal Article


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.

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Photonics and Optics