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. 24, 2015
Filed:
Oct. 25, 2012
Sumitomo Electric Industries, Ltd., Osaka-shi, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka-shi, Osaka, JP;
Abstract
An inexpensive low-attenuation optical fibersuitable for use as an optical transmission line in an optical access network is a silica based glass optical fiber and includes a coreincluding the center axis, an optical claddingsurrounding the core, and a jacketsurrounding the optical cladding. The core contains GeOand has a relative refractive index difference Δcore, based on the optical cladding, greater than or equal to 0.35% and less than or equal to 0.50% and has a refractive index volume v greater than or equal to 0.045 μmand less than or equal to 0.095 μm. The jacket has a relative refractive index difference ΔJ greater than or equal to 0.03% and less than or equal to 0.20%. Glass constituting the core has a fictive temperature higher than or equal to 1400° C. and lower than or equal to 1590° C. Residual stress in the core is compressive stress that has an absolute value greater than or equal to 5 MPa.