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:
Feb. 24, 2004
Filed:
Jan. 28, 2003
Applicant:
Inventors:
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 6/02 ; G02B 6/22 ;
U.S. Cl.
CPC ...
G02B 6/02 ; G02B 6/22 ;
Abstract
An optical fiber is composed of silica glass and comprises a center core region doped with F element, a ring core region doped with GeO , and an inner cladding region doped with F element; wherein a buffer layer composed of undoped SiO or SiO doped with one or both of P and Cl or a concentration gradient region in which GeO concentration radially decreases toward the boundary is provided between the center core region and the ring core region.