Patent ID: 6291256
Filing Date: 2001-09-18
Classification: H01S

Abstract:
A method of manufacturing a distributed feedback ridge semiconductor laser, the method comprising the steps of:forming a laser substrate along a plane normal to a first direction and comprising a cladding layer made of a material for a ridge stripe and a contact layer stacked along the first direction on an active layer;forming two lateral flat portions from said cladding layer and contact layer to form a ridge stripe protruding from the two lateral flat portions and having a flat top portion, the ridge stripe extending along a second direction that is substantially perpendicular to the first direction;forming a protective film and a resist layer in order to cover said lateral flat portions and said flat top portion;forming a latent image of a grating, the latent image having a periodic structure in the second direction and developing the latent image to form a grating pattern on said resist layer, the grating pattern having a periodic structure along the second direction;etching at least one lateral flat portion according to said grating pattern to form a grating on or in said active layer such that the grating is not formed in any region within or beneath the ridge stripe;forming an insulating layer on the surface of said grating and said flat top portion of the ridge stripe;performing etching to expose only said flat top portion of the ridge stripe on said insulating layer; andforming an electrode on said flat top portion.