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:
Jul. 23, 2013
Filed:
Jan. 28, 2011
Applicants:
Hiroyuki Yamazaki, Tokyo, JP;
Hirohito Yamada, Miyagi, JP;
Inventors:
Hiroyuki Yamazaki, Tokyo, JP;
Hirohito Yamada, Miyagi, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S 3/083 (2006.01); H01S 3/03 (2006.01);
U.S. Cl.
CPC ...
Abstract
A composite optical waveguideincludes a first optical waveguidecomprising a silica-based core and a second optical waveguidecomprising an Si-based core. The second optical waveguideis joined to the first optical waveguide. The length of the first optical waveguidecorresponds to a permissible propagation loss of the second optical waveguide. The second optical waveguideincludes a sharply curved portionhaving a radius smaller than the minimum bend radius of the first optical waveguide