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:
Sep. 30, 1997
Filed:
Mar. 05, 1996
The Furukawa Electric Co. Ltd., Tokyo, JP;
Abstract
A dispersion compensating optical fiber is proposed for application in a wavelength optical signal transmission system. This dispersion compensating fiber has a W shaped refractive index profile, and has a first core layer, a second core layer formed around the outside of the first core layer, and a cladding layer made of substantially pure silica formed around the outside of the second core layer. The first core layer is doped with germanium, so that its refractive index s increased by a proportional refractive index difference of about 2%. The second core layer is uniformly doped with fluorine, so that its refractive index is decreased by a proportional refractive index difference of about 0.58%. The ratio of the outer radius of the second core layer to the outer radius of the first core layer is about 2.5. The wavelength dispersion slope is in the negative region, the dispersion is made to be high negative dispersion, and moreover the dispersion slope compensation ratio from a wavelength of 1530 nm to a wavelength of 1570 nm is made to be a value close to the perfect dispersion ratio and about 0.75 to 1.25 thereof.