Patent ID: 6078707
Filing Date: 2000-06-20
Classification: G02B,H01L

Abstract:
A waveguide-photodetector, comprising:a semiconductor substrate;a waveguide section, provided on the semiconductor substrate, for propagating light;an opto-electric converting section, provided in the semiconductor substrate, for converting the light into an electric signal; andan insulative layer provided between the semiconductor substrate and the waveguide section,wherein the waveguide section includes at least an introducing part for introducing the light to the waveguide section, a coupling part for coupling the light introduced to the waveguide section to the opto-electric converting section, and a propagating part for propagating the light from the introducing part to the coupling part,the insulative layer includes a first region for defining a position and a shape of an impurity diffused region of the opto-electric converting section,wherein the insulative layer further includes a second region which encloses the first region and is thicker than the first region, and a step portion between the first region and the second region,the propagating part is formed on a smooth surface of at least one layer covering the first region and the second region, andthe introducing part, the propagating part and the coupling part of the waveguide section are located on the first region.