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:
Jun. 17, 2008
Filed:
Dec. 01, 2004
Carlos DE Barros, Boulogne-Billancourt, FR;
Lionel Provost, Marcoussis, FR;
Hélène Biscaras, Voisins-le-Bretonneux, FR;
Christine Moreau, Palaiseau, FR;
Carlos De Barros, Boulogne-Billancourt, FR;
Lionel Provost, Marcoussis, FR;
Hélène Biscaras, Voisins-le-Bretonneux, FR;
Christine Moreau, Palaiseau, FR;
ALCATEL, Paris, FR;
Abstract
An optical waveguide suitable for a slanted Bragg grating (SBG) to be written thereinto has a refractive index profile defining a core and a cladding and a specific photosensitivity profile. This photosensitivity profile W(r) is such that, for a given SBG writing angle θ, the coupling of the fundamental mode into itself as counterpropagation in the waveguide, K(θ), is substantially zero and such that its derivative K'(θ) with respect to the angle θ is also substantially equal to zero. The zero derivative, and also the zero coupling of the fundamental mode as a function of the angle, means that a widened reflection pocket about the grating write angle is guaranteed.