The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 15, 2018
Filed:
Jan. 13, 2017
Sumitomo Electric Device Innovations, Inc., Yokohama, JP;
Takayuki Watanabe, Yokohama, JP;
Sumitomo Electric Device Innovations, Inc., Yokohama, JP;
Abstract
A semiconductor laser diode type of a buried-hetero structure (BH-LD) is disclosed. The LD provides a mesa, a first burying layer, and a second burying layer, where the burying layers are provided in respective sides of the mesa so as to expose a top of the mesa. The mesa includes a lower cladding layer, an active layer, and an upper cladding layer, where the cladding layers have conduction type opposite to each other and, combined with the burying layers, constitute a carrier confinement structure. The second burying layer has an even surface overlapping with an even surface of the first burying layer, and has a thickness in a portion of the even surface that is thinner than a thickness thereof in a portion except for the even surface.