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:
Jan. 16, 2007
Filed:
Oct. 06, 2005
Shoichiro Matsuo, Sakura, JP;
Kuniharu Himeno, Sakura, JP;
Koichi Harada, Sakura, JP;
Masataka Ikeda, Sakura, JP;
Shoichiro Matsuo, Sakura, JP;
Kuniharu Himeno, Sakura, JP;
Koichi Harada, Sakura, JP;
Masataka Ikeda, Sakura, JP;
Fujikura, Ltd., Tokyo, JP;
Abstract
An optical fiber includes: a core at a center; a first cladding layer; a second cladding layer; and a third cladding layer. A maximum refractive index of the core is greater than any of maximum refractive indices of the first cladding layer, the second cladding layer, and the third cladding layer, and the maximum refractive index of the second cladding layer is smaller than any of the maximum refractive indices of the first and the third cladding layer. Additionally, a ratio of a/ais not less than about 2.5 and not more than about 4.5, where arepresents the radius of the core, and arepresents the radius of an outer periphery of the first cladding layer, and a relative refractive index difference of the core with respect to a maximum refractive index of the third cladding layer is not less than 0.20% and not more than 0.70%.