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:
Mar. 15, 2005
Filed:
Aug. 29, 2001
Philippe Grosso, Lannion, FR;
David Mechin, Chalmazel, FR;
Philippe Grosso, Lannion, FR;
David Mechin, Chalmazel, FR;
France Telecom, Paris, FR;
Abstract
The invention provides a method of photoinducing a Bragg grating in an optical fiber () or a waveguide, in which a selected zone of the fiber () or waveguide is subjected to a step of being exposed with a source beam () using a mirror () in such a manner as to fold a portion () of the source beam () as reflected by the mirror () onto a portion () of the source beam that is not reflected by the mirror, thereby obtaining a diffraction grating in the fiber () or waveguide, the method being characterized in that an additional exposure step is performed on said portion of the fiber () or waveguide, and in that relative displacement is imparted between the two exposure steps to elements selected from the beam (), the fiber () or waveguide, and the mirror () in such a manner as to cause a same portion of the beam () used for photoinduction in both exposure steps to be reflected by the mirror () in one of the steps and not reflected by the mirror () in the other step.