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. 18, 2003
Filed:
Nov. 02, 2001
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
An optical fiber for forming an optical transmission line suitable for the wavelength division multiplexing transmission by connecting to a positive dispersion optical fiber is provided. Outside a first glass layer ( ), a second glass layer ( ), a third glass layer ( ) and a fourth glass layer ( ) are sequentially disposed. The fourth glass layer ( ) is to be a reference layer for a standard of a refractive index. A relative refractive index difference &Dgr; of the first glass layer to the reference layer is set 1.6% to 2.6%, inclusive, a relative refractive index difference &Dgr; of the second glass layer is set −0.65% to −0.4%, inclusive, and a relative refractive index difference &Dgr; of the third glass layer is set 0.15% to 0.5%, inclusive.