Method of forming an optical fibre coupler and a coupler so...

G - Physics – 02 – B

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G02B 6/28 (2006.01) C03B 37/15 (2006.01)

Patent

CA 2046286

Six secondary optical fibres (20) are located about and parallel to a central optical fibre (21) by a capillary tube (22) to form a fibre bundle which is then formed into a fused, tapered coupler in which the tapering is stopped when the proportions of light coupled out of the central fibre (21) at 1.3 and 1.53 µm are first equal. The fusion process can provide sufficient fusion between the central fibre and each secondary fibre to provide a 1 to (n + 1) coupler where n is the number of secondary fibres. This method provides a coupler which is wavelength-flattened between 1.3 and 1.53 µm using similar fibres.

Six fibres optiques secondaires (20) sont positionnées autour d'une fibre optique centrale (21) et parallèlement à celle-ci par un tube capillaire (22) pour former un faisceau de fibres qui est ensuite adapté à un coupleur conique fusionné dont l'effilement est arrêté lorsque les proportions de la lumière couplée à partir de la fibre centrale (21) à 1,3 et 1,53 µm sont égales pour la première fois. Le processus de fusion peut assurer une fusion suffisante entre la fibre centrale et chaque fibre secondaire pour permettre l'adaptation à un coupleur 1 : (n+1), où n est le nombre de fibres secondaires. Cette méthode produit un coupleur dont la longueur d'onde est aplatie entre 1,3 et 1,53 µm au moyen de fibres semblables.

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