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:
Nov. 02, 2004
Filed:
Aug. 01, 2002
Ludovic Fleury, Bois D'Arcy, FR;
Louis-Anne de Montmorillon, Paris, FR;
Pierre Sillard, Le Chesnay, FR;
Pascale Nouchi, Maisons-Lafitte, FR;
Alcatel, Paris, FR;
Abstract
The invention provides a fiber with continuously changing chromatic dispersion; it limits the quantity of dispersion-compensating fiber needed in a transmission system to compensate the cumulative chromatic dispersion in the line fiber. The fiber has a higher chromatic dispersion at a first end than at the other end, referred to as the second end. The chromatic dispersion varies along the fiber, decreasing over at least a portion of the fiber. At the first end the chromatic dispersion can be of the order of the dispersion of a conventional line fiber, i.e. close to 8 ps/(nm.km). At the second end the chromatic dispersion can have a value of the order of 4 ps/(nm.km). The fiber is used as the line fiber in a transmission system at the beginning of a section between two repeaters. The chromatic dispersion in the vicinity of the first end limits non-linear effects at the beginning of the section; the decrease of the chromatic dispersion in the fiber ensures that at its second end the fiber can be connected to a fiber having lower chromatic dispersion. The fiber can be produced with an index profile in the shape of a rectangle and a ring by varying only the indices, and not the radii.