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. 27, 2010
Iwao Shimotakahara, Tokyo, JP;
Ryuichi Sugizaki, Tokyo, JP;
Takeshi Yagi, Tokyo, JP;
Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
An optical fiber suitable for high-capacity transmission having a large effective core area, a low bending loss, and capable of single mode operation at 1550 nm is provided. The optical fiberhas an effective core area ≧175 μmat 1550 nm, a bending loss ≦10 dB/m at a bending diameter of 20 mm at 1550 nm, and a cut-off wavelength λ≦1550 nm. The optical fiber has a first coreat the center, which has a refractive index higher than that of the cladding; and a second corearound the first core, which has a refractive index lower than that of the cladding; a primary medium portion; and secondary medium portions, which have a refractive index lower than that of the primary medium portion and the secondary medium portions have a plurality of first secondary medium portionsaround the first coreand a plurality of second secondary medium portionsaround the first coreand outside of the first secondary medium portions