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:
Apr. 25, 2017
Filed:
Mar. 11, 2014
Applicant:
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Inventor:
Manabu Matsuda, Atsugi, JP;
Assignee:
FUJITSU LIMITED, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S 5/12 (2006.01); H01S 5/062 (2006.01); H01S 5/0625 (2006.01); H01S 5/10 (2006.01); H01S 5/22 (2006.01); H01S 5/223 (2006.01);
U.S. Cl.
CPC ...
H01S 5/124 (2013.01); H01S 5/1225 (2013.01); H01S 5/0622 (2013.01); H01S 5/06258 (2013.01); H01S 5/1014 (2013.01); H01S 5/1017 (2013.01); H01S 5/22 (2013.01); H01S 5/2218 (2013.01); H01S 5/2231 (2013.01);
Abstract
An optical device includes an active layer disposed over a semiconductor substrate, a diffraction grating disposed over the active layer, a clad layer partly disposed over the diffraction grating, at least one first burying material layer disposed beside side surfaces of end portions of the clad layer over the diffraction grating, and at least one second burying material layer disposed beside side surfaces of a center portion of the clad layer over the diffraction grating. A refractive index of the at least one first burying material layer is different from a refractive index of the at least are second burying material layer.