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:
Apr. 08, 2003
Filed:
Apr. 20, 2001
Fujikura Ltd., Tokyo, JP;
Abstract
In the present invention, by forming a dispersion shifted optical fiber that has a refractive index profile comprising: a central core portion ; a step core portion provided at an outer periphery of the central core portion and having a refractive index lower than that of the central core portion ; and cladding provided at an outer periphery of the step core portion and having a refractive index lower than that of the step core portion , and which dispersion shifted optical fiber has, in a used wavelength band that is selected from between 1490 and 1625 nm, chromatic dispersion values of 7 to 15 ps/km/nm, an Aeff of 60 to 150 &mgr;m , a dispersion slope of 0.09 ps/km/nm or less, a bending loss of 100 dB/m or less, and a cutoff wavelength that provides essentially single mode transmission, it is possible to reduce the cost of the system and to achieve n improvement in the transmission characteristics.