Multi-neckdown fiber optic coupler

G - Physics – 02 – B

Patent

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Details

G02B 6/26 (2006.01) G02B 6/28 (2006.01) G02B 6/34 (2006.01) G02B 6/24 (2006.01)

Patent

CA 2208003

A unitary fiber optic coupling device (10) in which N fibers (16) (N3) extend in a parallel array having two coupling regions (11, 12) of reduced cross- sectional area. At least one of the fibers (16) is formed of two sections that are situated end-to-end, an active core-containing fiber (47) section that is situated in the first coupling region and a dummy fiber section (52) that is situated in the second coupling region. The coupler also contains at least second and third fibers that are active core-containing fibers (47) throughout their lengths. The second and third fibers couple to one another in the first coupling region but remain uncoupled to one another in the second coupling region. Two fibers that couple in the first coupling region do not couple in the second coupling region, thus avoiding resonance effects.

L'invention porte sur un coupleur (10) monobloc pour plusieurs fibres optiques dans lequel N fibres (16) (N?3) disposées en parallèle se divisent en deux zones de couplage (11, 12) de superficie de section réduite. L'une au moins des fibres (16) est constituée de deux parties placées bout à bout, d'une partie de fibre (47) contenant le noyau actif située dans la première zone de couplage, et de parties de fibres fictives (52) situées dans la deuxième zone de couplage. Le coupleur comporte également au moins une deuxième et une troisième fibre (47) à noyau actif s'étendant sur toute leur longueur. Les deuxième et troisième fibres se raccordent l'une à l'autre dans la première zone de couplage, mais restent non raccordées dans la deuxième zone de couplage. Deux fibres raccordées dans la première zone de couplage ne le sont donc pas dans la deuxième, ce qui évite les effets de résonance.

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