Temperature stable bragg grating package with post tuning...

G - Physics – 02 – B

Patent

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Details

G02B 5/18 (2006.01) G02B 6/00 (2006.01) G02B 6/10 (2006.01) G02B 6/293 (2006.01) G02B 6/34 (2006.01) G02F 1/225 (2006.01)

Patent

CA 2294252

A method of accurately setting the centre wavelength of a fibre grating fixed in a temperature compensation package, the method comprising the steps of: fixing the grating to the package and altering the size of the package in a post processing step. The altering step can comprise elongating or compressing the package so as to substantially permanently alter the size of the package. The temperature compensation package can comprise: a first elongated member having a first coefficient of thermal expansion; two second elongated members, one each attached to the ends of the first elongated member and having their other second ends closer together than the ends of the first elongated member, the second elongated members having a second coefficient of thermal expansion relatively more than the first coefficient of thermal expansion; and two material matching members attached to the second ends and adapted to provide for material matching fixing mixtures to the second elongated members; said fixing mixtures to the second elongated members; said fixing mixtures fixing ends of the fibre grating to the temperature compensation package. The fixing mixture can comprise glass of metal solder. The material matching members are preferably located within an aperture in the second ends.

Ce procédé de réglage précis de la longueur d'onde centrale d'un réseau de fibres fixé dans un boîtier à compensation de température comprend les étapes consistant à fixer le réseau dans le boîtier et à modifier la dimension de ce dernier dans une étape de traitement ultérieure qui peut consister à allonger ou comprimer le boîtier de façon à modifier de façon sensiblement permanente la dimension de celui-ci. Ce boîtier comprend un premier élément de forme allongée, possédant un premier coefficient d'expansion thermique, deux seconds éléments de forme allongée, fixés chacun au niveau d'une extrémité sur les extrémités du premier élément, leur autre extrémité étant plus proche chacune l'une de l'autre que les extrémités du premier élément, ces seconds éléments possédant en outre un second coefficient d'expansion thermique, relativement supérieur au premier coefficient, ainsi que deux éléments de couplage de matériaux, fixés sur les secondes extrémités et conçus pour permettre aux seconds éléments de recevoir des mélanges de fixation et de couplage servant à fixer les extrémités du réseau de fibres sur le boîtier. Le mélange de fixation peut comporter du verre ou du métal de scellement. Les éléments de couplage de matériaux sont, de préférence, situés dans une ouverture ménagée dans les secondes extrémités.

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