Fiber grating, its manufacturing method and its...

G - Physics – 02 – B

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G02B 6/10 (2006.01) G02B 5/18 (2006.01) G02B 6/02 (2006.01)

Patent

CA 2311725

A highly reliable fiber grating and its manufacturing method, wherein: as a core (2), in addition to Ge of an ordinary concentration equivalent to the concentration of the core of a connection object optical fiber, a core co- doped with Sn and Al of predetermined concentrations is employed; a primary covering layer (4) made of ultraviolet ray transmitting resin which transmits an ultraviolet ray with a wavelength of 240 nm - 270 nm and, on the other hand, absorbs an ultraviolet ray with a wavelength in wavelength regions shorter than 240 nm and longer than 270 nm to be cured is applied to the core and the glass part (F) of a cladding (3); a grating is written by applying an ultraviolet ray to the outside of the primary covering layer; and a secondary covering layer (7) made of resin which has a negative linear expansion coefficient so as to cancel and suppress the elongation and contraction caused by the positive linear expansion coefficient of the glass part involving temperature change is applied to the primary covering layer; whereby the grating can be written without causing the deterioration of transmission characteristics and, in addition, both the transmission characteristics and mechanical characteristics can be satisfied at the same time while the improvement of productivity is not obstructed and, moreover, temperature characteristics can be stabilized.

L'invention porte sur un réseau de fibres extrêmement fiable et sur son procédé de fabrication. Ce réseau comprend une âme (2), et en plus de la concentration ordinaire de Ge équivalente à la concentration de l'âme d'une fibre optique de raccordement, on utilise une âme co-dopée avec des concentrations prédéterminées de Sn et Al. Une couche (4) de recouvrement primaire, formée dans une résine transmettant les rayons ultraviolets, transmet un rayon ultraviolet d'une longueur d'onde comprise entre 240 et 270 nm, et d'un autre côté, absorbe un rayon ultraviolet dont la longueur d'onde comporte des régions inférieures à 240 nm et supérieures à 270 nm, cette couche devant être durcie est appliquée sur l'âme et la partie en verre (F) d'une gaine (3). On grave un réseau en appliquant un rayon ultraviolet sur l'extérieur de la couche de recouvrement primaire; et on applique sur la couche de recouvrement primaire une couche (7) de recouvrement secondaire en résine qui a un coefficient de dilatation linéaire négatif de façon à annuler et supprimer l'élongation et la contraction provoquée par le coefficient de dilatation linéaire négatif de la partie en verre et par la variation de température. Il est possible de graver le réseau sans détériorer les caractéristiques de transmission, et d'autre part, de satisfaire aux caractéristiques de transmission et aux caractéristiques mécaniques, au même moment, sans nuire à la productivité, les caractéristiques de température pouvant être au demeurant stabilisées.

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