Patent ID: 8901694

Claim:
An optical input/output device comprising: a substrate including a first region and a second region; an upper trench; disposed in the substrate, the upper trench running across the first region and the second region; a waveguide disposed within the upper trench of the first region of the substrate; a photodetector disposed within the upper trench of the second region of the substrate and including a first end surface optically connected to an end surface of the waveguide; and a light-transmitting insulating layer interposed between the end surface of the waveguide and the first end surface of the photodetector, wherein a horizontal width of the photodetector is the same as a horizontal width of the waveguide, wherein a horizontal width of the upper trench disposed in the second region is greater than a horizontal width of the upper trench disposed in the first region, and wherein the substrate further includes a seed region exposed by the upper trench, and the seed region is disposed in the second region of the substrate.