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:
Dec. 01, 2009
Filed:
Apr. 01, 2005
Lionel Provost, Dampart, FR;
Gilles Melin, Orsay, FR;
Laurent Gasca, Villebon-sur-Yvette, FR;
Alcatel, Paris, FR;
Abstract
The invention relates to optical fibers incorporating cavities in their structure. This is an optical fiber comprising: a central core (); a first annular region (ra) surrounding the central core (); a second annular region (rb) surrounding the first annular region (ra) and comprising medium-size cavities () the cross section whereof remains strictly between a given first threshold and a given second threshold strictly higher than the first threshold; a third annular region (rc) surrounding the second annular region (rb) and comprising large cavities () the cross section whereof remains strictly above the second threshold; in a cross section of the optical fiber, any radius that goes from the center of the core towards the exterior of the optical fiber encounters at least either a medium-size cavity () in the second annular region (rb) or a large cavity () in the third annular region (rc); and the average distance between the outer perimeter (Ca) of the second annular region (rb) and the inner perimeter (Cb) of the third annular region (rc) is less than half the average dimension of a large cavity ().