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. 27, 2004
Filed:
Oct. 25, 2001
Shinichi Arai, Chiyoda-Ku, JP;
Ryuichi Sugizaki, Chiyoda-Ku, JP;
Keiichi Aiso, Chiyoda-Ku, JP;
Naoto Oyama, Chiyoda-Ku, JP;
Jun Terada, Chiyoda-Ku, JP;
Hisashi Koaizawa, Chiyoda-Ku, JP;
Katsunori Inoue, Chiyoda-Ku, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
A low-dispersion optical fiber provides both reduced chromatic dispersion in a used wavelength band and increased effective core area. The low-dispersion optical fiber is made by covering a center core ( ) with a first side core ( ), covering the first side core ( ) with a second side core ( ), and covering the second side core ( ) with a cladding ( ). When the maximum refractive index of the center core ( ) is written n the minimum refractive index of the first side core ( ) is written n , the maximum refractive index of the second side core ( ) is written n and the refractive index of the cladding ( ) is written nc, then n n nc>n is satisfied. Relative refractive index differences &Dgr;1, &Dgr;2 and &Dgr;3 with respect to the cladding ( ) of the maximum refractive index of the center core ( ), the minimum refractive index of the first side core ( ) and the maximum refractive index of the second side core ( ) respectively are made 0.4%≦&Dgr;1≧0.7%, −0.30%≦&Dgr;2≦−0.05% and 0.2%≦&Dgr;3.