Patent ID: 6363092
Filing Date: 2002-03-26
Classification: B82Y,H01S

Abstract:
A method of forming a semiconductor laser comprising:(a) providing a semiconductor substrate having a surface on which epitaxial layers may be formed; (b) growing on the surface of the substrate at least a lower cladding layer, then a lower confinement layer, their an active region layer in which light emission occurs, and then an upper confinement layer that is free of aluminum; (c) then etching a distributed feedback grating structure on the aluminum free upper confinement layer comprising periodically alternating elements; and (d) then growing an upper cladding layer over the grating etched in the upper confinement layer to provide a grating in which the adjacent elements in the grating differ from one another in dielectric constant so as to provide optical feedback for a selected wavelength of light generation from the active region.