Patent ID: 9620931
Date: 2017-04-11
CPC Classifications: G02B,H01S,H04B

Claim:
1. An optical device, comprising: a silicon waveguide core having a tapered portion having a sectional size that decreases toward a terminal end portion thereof; a dielectric waveguide core contiguous to the silicon waveguide core while covering at least the tapered portion, the dielectric waveguide core having a refractive index lower than that of the silicon waveguide core and configuring a single-mode waveguide; and a diffraction grating provided at a region, in which the silicon waveguide core does not exist, of a dielectric waveguide including the dielectric waveguide core and configuring a distributed Bragg reflection mirror, the diffraction grating not being in contact with the silicon waveguide core; wherein the diffraction grating is configured from a silicon film having a refractive index greater than that of the dielectric waveguide core and is provided on the same plane as that of the silicon waveguide core.