An abrupt bend structure with a corner reflector on LiNbO3 is proposed. In
the proposed structure, a region whose refractive index is higher than that
of the substrate is placed at the corner of the bend. The interface betwee
n the substrate and the high index region is used as a reflector for the gu
ided wave. The calculated normalized transmission power is about 94% even w
hen the bend angle is 10(0).