Optical transmission device
AssigneeHitachi, Ltd.
InventorsHiroshi Sato, Masahiro Aoki, Tsurugi Sudoh, Akira Taike, Tomonobu Tsuchiya, Masaaki Komori, Kazuhisa Uomi
Life of this patent
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Abstract
An optical transmission device particularly adapted to a high-speed and large-capacity optical transmission system with a large optical output and excellent reflection resistance includes a waveguide-type optical element for emerging light and an optical transmission path that is to be optically coupled to the waveguide-type optical element. The waveguide-type optical element includes, at least in part thereof, a light-emitting portion having a gain-coupled diffraction grating and a mode-converting region integrated with the light-emitting portion.
Claims5
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.
An optical transmission device having an optical module for generating an optical signal, the optical module including 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, 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 to be 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 of the light, the mode-converting region including a p-InP clad layer having a high-resistance region.
Dependencies are inferred from the claim text.