| CPC G02B 6/4214 (2013.01) [H04B 10/60 (2013.01)] | 10 Claims |
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1. An optical receiver sub-assembly comprising:
a substrate;
an optical waveguide device mounted on the substrate to transfer ray incident from a ray source; and
a photodetector mounted on the substrate and disposed under a vertical cross-sectional surface of the optical waveguide device,
wherein the ray is sequentially reflected and refracted by an upper slope surface and a lower slope surface provided in the vertical cross-sectional surface and is vertically incident on an active area of the photodetector,
wherein the optical waveguide device comprises:
an optical waveguide core transferring the incident ray; and
an optical waveguide clad surrounding the optical waveguide core and having a refractive index which is less than a refractive index of the optical waveguide core,
wherein the upper slope surface is a vertical cross-sectional surface of the optical waveguide core, and the lower slope surface is a vertical cross-sectional surface of the optical waveguide clad,
wherein the upper slope surface reflects ray incident from a ray source,
a boundary interface between the optical waveguide core and the optical waveguide clad refracts the ray, reflected by the upper slope surface, at a first refraction angle “θcladding”, and
the lower slope surface refracts the ray, refracted at the first refraction angle “θcladding”, at a second refraction angle “θair” to vertically irradiate the refracted ray onto a surface of the active area.
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