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:
Jul. 27, 2004
Filed:
Mar. 29, 2002
Naomi Kumano, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
The present invention provides an optical fiber forming an optical transmission line for wavelength division multiplexing transmission in a 1.5 &mgr;m wavelength band, for example. The cutoff wavelength is set in the range of 1.3 &mgr;m or more to 1.4 &mgr;m or less, and the chromatic dispersion value at a wavelength of 1.55 &mgr;m is set to 4 to 10 ps/nm/km. The effective core area in at least a setup wavelength band of the 1.5 &mgr;m wavelength band is set to 40 &mgr;m to 60 &mgr;m , and the dispersion slope in the 1.55 &mgr;m wavelength band is set to a positive value below 0.035 ps/nm /km. The zero dispersion wavelength is set to 1.43 &mgr;m or less, and the bending loss at the diameter of 20 mm in the 1.5 &mgr;m wavelength band is set to 5 dB/m or less. The refractive index profile of the optical fiber is designed so that the relative refractive index difference &Dgr;1 of a first glass layer ( ) of the innermost layer from a standard layer ( ) and the relative refractive index difference &Dgr;3 of a third glass layer ( ) at a third-layer position from the innermost from the standard layer ( ) are set to positive values, and the relative refractive index difference &Dgr;2 of a second glass layer ( ) at a second-layer position from the innermost from the standard layer ( ) is set to a negative value.