Waveguide photodetectors for reducing retro-reflection and increasing bandwidth

Abstract

A waveguide photodetector for reducing retro-reflection and increasing bandwidth is provided. The waveguide photodetector includes a waveguide photodiode comprising: a main waveguide; an absorbing waveguide integrated with the main waveguide, one or more of the absorbing waveguide and the main waveguide having an optical axis; an n-doped semiconductor region along a first side of the absorbing waveguide; a p-doped semiconductor region along a second side of the absorbing waveguide, the second side opposite the first side; and an input facet at the absorbing waveguide, the input facet forming an acute angle with the optical axis, and an interior of the input facet angled towards the p-doped semiconductor region, such that light input to the input facet is refracted towards the p-doped semiconductor region.

Dependencies are inferred from the claim text.