Patent ID: 6606443
Filing Date: 2003-08-12
Classification: B82Y,H01S

Abstract:
An optical module comprising a waveguide-type optical device for radiating light and an optical transmission path optically coupled to the waveguide-type optical device, the waveguide-type optical device having an optical waveguide layer structure, the optical waveguide layer structure having, at least in a part thereof, a light-emitting region and a mode-converting region optically coupled to the light-emitting region for narrowing a beam of light, emitted by the light-emitting region, for radiation to an external of the device, the light-emitting region including, at least in a part thereof, a diffraction grating made of a composition material having a band gap wavelength shorter than a wavelength of light emitted by the light-emitting region so that an increase of an optical gain of the light emitting region cyclically changes in the part where the diffraction grating is provided, a refractive index of the diffraction grating cyclically changing in a direction of travel light, the mode-converting region including a p-InP clad layer having a high-resistance region.