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. 10, 2015
Filed:
Apr. 10, 2013
Shin-etsu Chemical Co., Ltd., Tokyo, JP;
Hiroshi Oyamada, Gunma, JP;
Hitoshi Nakajima, Gunma, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
An optical fiber comprising a first core, a second core, a third core, and a cladding, wherein with a refractive index of the cladding as a reference, Δ1 is a maximum value of a relative refractive index difference of the first core, Δ2 is a maximum value of a relative refractive index difference of the second core, Δ3 is a minimum value of a relative refractive index difference of the third core, 'a' is a half-value radial width for the relative refractive index difference (Δ1−Δ2) of the first core, 'b' is a radius of a second core/third core boundary, and “c” is a radius of a third core/cladding boundary, the expressions 0.30%≦Δ1≦0.45%, −0.05%≦Δ2≦0.05%, −0.6%≦Δ3≦−0.3%, 2.85≦b/a, 10 μm≦b≦15 μm, and 3 μm≦c−b≦5.5 μm are satisfied, and transmission loss for a wavelength of 1550 nm when the optical fiber is wound around a mandrel with a diameter of 10 mm is no greater than 0.2 dB/turn.