A simple method for improving the input coupling in uncleaved waveguide photodetectors is demonstrated. A wedge-shaped recess is incorporated into the input facet to reduce reflection. Over a range of device sizes and wedge shapes, mean quantum efficiency was increased by 16% relative to flat, uncleaved input facets.
© 2002 Optical Society of America
G. S. Kinsey, R. Sidhu, A. L. Holmes, Jr., and J. C. Campbell, "Improved optical coupling in waveguide photodetectors incorporating a wedge-shaped input facet," Opt. Lett. 27, 749-750 (2002)