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:
Feb. 22, 2005
Filed:
Jun. 24, 2003
Carlos DE Barros, Boulogne-Billancourt, FR;
Lionel Provost, Marcoussis, FR;
Marianne Molina, Paris, FR;
Isabelle Riant, Orsay, FR;
Laurent Gasca, Villebon sur Yvette, FR;
Carlos De Barros, Boulogne-Billancourt, FR;
Lionel Provost, Marcoussis, FR;
Marianne Molina, Paris, FR;
Isabelle Riant, Orsay, FR;
Laurent Gasca, Villebon sur Yvette, FR;
Alcatel, Paris, FR;
Abstract
An optical filter comprising a slanted Bragg grating inscribed in an optical fiber portion comprising a core having a refractive index nand a radius Rand a cladding having an average refractive index nlower than nand a radius R, the core and the cladding of the fiber being doped with a photosensitive dopant in the fiber portion comprising the Bragg grating, which filter is characterized in that, in the fiber portion comprising the Bragg grating, the photosensitivity of the cladding is greater than the photosensitivity of the core and the cladding includes an index step area having a refractive index ngreater than nand less than n, said index step area having a width L defined by an inside radius Rgreater than or equal to the radius Rof the core and an outside radius Rless than or equal to the radius Rof the cladding.