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:
Mar. 10, 2026
Filed:
Nov. 22, 2022
Applicant:
Lumentum Japan, Inc., Sagamihara, JP;
Inventor:
Atsushi Nakamura, Komoro, JP;
Assignee:
Lumentum Japan, Inc., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S 5/0625 (2006.01); H01S 5/028 (2006.01); H01S 5/12 (2021.01); H01S 5/183 (2006.01);
U.S. Cl.
CPC ...
H01S 5/06258 (2013.01); H01S 5/0287 (2013.01); H01S 5/124 (2013.01); H01S 5/1835 (2013.01);
Abstract
Provided is a semiconductor laser that includes: an active layer; a grating layer including a phase shift portion with partially different grating periods; a contact layer placed above the grating layer; a highly resistive element higher in electric resistance than the contact layer; and an electrode in contact with the contact layer, and the highly resistive element is below at least a part of a portion of the electrode that overlaps with the phase shift portion.