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. 01, 2011
Filed:
Oct. 24, 2008
Iwao Shimotakahara, Tokyo, JP;
Harumi Inaba, Tokyo, JP;
Ryuichi Sugizaki, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
An optical fiber has a refractive index profile approximated by n(r)=n1[1-2(Δ1/100)(r/a)^α]when 0<r≦a, and n(r)=n1[1-2(Δ1/100)]when a<r, where n1 is refractive index at the center of a core, Δ1 is relative refractive index difference between the center of the core and a cladding, a is radius of the core, α is refractive index profile parameter, and ^ represents an exponential. α is 1.95 to 2.15. The relative refractive index difference is 1.5% or larger. A diameter of the core is 20 μm to 45 μm. A diameter of the cladding is 70 μm to 90 μm. A bending loss at 850 nm when bending the optical fiber with a curvature radius of 5 mm is 0.1 dB/turn or lower.