Fiber bragg gratings in chalcogenide or chalcohalid based...

G - Physics – 02 – B

Patent

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G02B 6/34 (2006.01)

Patent

CA 2271127

A reflective Bragg grating (21) in the interior of an infrared transmitting glass fiber (15), and its method comprising the steps of: producing first and second writing beams (11, 13) at the same wavelength; orienting the first and second writing beams (11, 13) in parallel with respect to each other; crossing the first and second writing beams at a preselected angle with respect to each other to form an interference pattern at the intersection of the first and second writing beams (11, 13); positioning the infrared transmitting glass fiber (15) at the intersection of the first and second writing beams (11, 13) so that the interference pattern occurs along a portion of the length of the infrared transmitting glass fiber (15); and maintaining the infrared transmitting glass fiber (15) at the intersection of the first and second writing beams (11, 13) for a time sufficient to produce a Bragg grating (21) in the core and cladding of the infrared transmitting glass fiber (15).

L'invention se rapporte à un réseau (21) de Bragg réfléchissant, situé dans une fibre de verre (15) transmettant les infrarouges, et au procédé qui y est associé et qui consiste à: produire un premier et un second faisceaux (11, 13) d'inscription à une même longueur d'onde; orienter le premier et le second faisceaux (11, 13) d'inscription en parallèle l'un par rapport à l'autre; croiser le premier et le second faisceau d'inscription l'un sur l'autre à un angle prédéterminé de façon à former un motif d'interférence à l'intersection du premier et du second faisceau (11, 13) d'inscription; placer la fibre de verre (15) transmettant les infrarouges à l'intersection du premier et du second faisceaux (11, 13) d'inscription de sorte que le motif d'interférence soit présent le long d'une partie de la longueur de la fibre de verre (15) transmettant les infrarouges; et maintenir la fibre de verre (15) transmettant les infrarouges sur l'intersection du premier et du second faisceau (11, 13) d'inscription pendant le temps nécessaire à produire un réseau (21) de Bragg dans le noyau et la gaine de la fibre de verre (15) transmettant les infrarouges.

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