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. 20, 2001
Filed:
Aug. 18, 1998
Applicant:
Inventor:
Kiichi Hamamoto, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S 5/00 ; G02B 6/26 ; G02B 6/42 ;
U.S. Cl.
CPC ...
H01S 5/00 ; G02B 6/26 ; G02B 6/42 ;
Abstract
In a semiconductor laser device, a first section including a single-mode waveguide and a second section including N (N=2, 3 . . . ) single-mode waveguides are provided. A third section including a 1×N multi-mode interference type waveguide is provided and has an end connected to the first section and has another end connected to the second section.