Distributed feedback laser device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorYuichiro Okunuki
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Abstract
A distributed feedback laser device capable of inhibiting a beam coupling coefficient from variation resulting from fabrication dispersion and improving the fabrication yield is obtained. The distributed feedback laser device comprises cladding layers provided on an InP substrate and located on both sides of an active layer and a diffraction grating having grating bars, different in refractive index from the cladding layers, provided in either cladding layer to extend in a direction perpendicular to a light emission direction at a prescribed pitch in the emission direction, as well as at least one light distribution control layer, located in the cladding layer apart from the diffraction grating, having the same composition as the diffraction grating.
Claims9
A distributed feedback laser device formed by a laser oscillator comprising cladding layers provided on a semiconductor substrate and located on both sides of an active layer and a diffraction grating having grating bars, different in refractive index from said cladding layers, provided in either said cladding layer to extend in a direction perpendicular to a light emission direction at a prescribed pitch in the emission direction, comprising:
- at least one light distribution control layer, located in said cladding layer apart from said diffraction grating, having the same composition as said diffraction grating.
Dependencies are inferred from the claim text.