Patent ID: 8218591

Claim:
An LD of a ridge waveguide type, comprising: a semiconductor substrate including two edge regions and a central region put between the edge regions; a core region provided on said semiconductor substrate, said core region including an active layer laterally extending in a whole of said semiconductor substrate; a ridge waveguide structure provided on said core region, said ridge waveguide including a cladding portion extending in a direction along which light generated in said active layer is guided; an insulating layer provided on a top and sides of said ridge waveguide structure and on said core region, said insulating layer having a window aligned with said ridge waveguide structure; a resin layer configured to bury said ridge waveguide structure in said central region; and an electrode extending from one facet to another facet of said LD along said ridge waveguide, said electrode directly coming in contact to said cladding portion through said window, wherein said edge regions of said substrate provide no resin layer, wherein said electrode is provided on said top and sides of said ridge waveguide structure and on said core region through said insulating layer in said edge regions, and wherein said electrode is provided on said top and sides of said ridge waveguide structure and on said resin layer in said central region.