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:
Nov. 11, 2008
Filed:
Jan. 21, 2004
Applicants:
Yuu Ishii, Chiba, JP;
Ryokichi Matsumoto, Chiba, JP;
Daiichiro Tanaka, Chiba, JP;
Inventors:
Assignee:
Fujikura Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/26 (2006.01); G02B 6/42 (2006.01);
U.S. Cl.
CPC ...
Abstract
An optical fiber coupler is comprised of a fusion-elongated portionin which an optical fiberwhich is designed and fabricated for use at a wavelength in the vicinity of 1.55 μm and an optical fiberwhich is designed and fabricated for use at a wavelength in the vicinity of 0.98 μm are fused and elongated. The propagation constant difference between optical fibersandis 10rad/μm or smaller.