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:
Sep. 07, 1999
Filed:
Aug. 04, 1997
Applicant:
Inventor:
Naoki Kitamura, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 28 ; 385 14 ; 385 31 ; 385 43 ; 385 48 ; 385 50 ; 385129 ;
Abstract
An optical coupler having a substrate; an optical waveguide provided on the substrate; a multimode fiber optically coupled with the optical waveguide; and a single mode fiber optically coupled with the optical waveguide, the optical waveguide provided on the substrate having a multimode waveguide and a plurality of single mode waveguides, the multimode waveguide being optically coupled with the multimode fiber, the single mode waveguide being optically coupled with the single mode fiber. The above constitution can suppress the creation of branch loss.