G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 6/255 (2006.01) G02B 6/26 (2006.01) G02B 6/42 (2006.01)
Patent
CA 2078272
Process for limiting losses from the joining together of monomode optic fibre having a Wo mode diameter, comprised of a core and fibre cladding, and the bundle issuing from an optical system, the mode diameter W'o whereof is smaller than Wo. The process consists in joining together by splicing to the end of the said monomode fibre a segment of multimode fibre also comprised of a core and fibre cladding, being between 0,1 and 5mm in length and a .DELTA.n deviation index of between 5.10-3 and 560.10-3, and of which the end face next to the said optical system presents a convex spherical dioptre, the said segment having the same external cladding diameter as the said monomode fibre, the assembly constituted by the said multimode fibre segment and the said monomode optic fibre having a mode diameter, measured at the exit point of the optic system, sensibly equal to W'o. The splice is done by heating to join the said multimode segment to the said monomode fibre in such a way as to form at the joining point of the said cores, by radial and longitudinal interdiffusion of the dopant elements contained in the said cores, a cone of adiabatic transition ensuring mutual adaptation of the mode diameters of the said monomode fibre and said segment respectively.
Procédé pour limiter les pertes par couplage entre une fibre optique monomode de diamètre de mode Wo, comprenant un coeur et une gaine optique, et le faisceau issu d'un système optique, de diamètre de mode W'o inférieur à Wo. Le procédé consiste à raccorder par épissure à l'extrémité de ladite fibre monomode un tronçon de fibre multimode comprenant également un coeur et une gaine optique, ayant une longueur comprise entre 0,1 et 5 mm et un écart d'indice .DELTA.n compris entre 5.10-3 et 560.10-3, et dont la face extrême voisine dudit système optique présente un dioptre sphérique convexe, ledit tronçon ayant le même diamètre extérieur de gaine que ladite fibre monomode, l'ensemble constitué par ledit tronçon de fibre multimode et ladite fibre optique monomode ayant un diamètre de mode, mesuré en sortie dudit système optique, sensiblement égal à W'o. L'épissure consiste à effectuer un chauffage pour raccorder ledit tronçon multimode à ladite fibre monomode, de manière à former au niveau de la zone de jonction desdits coeurs, par interdiffusion radiale et longitudinale des éléments dopants contenus dans lesdits coeurs, un cône de transition adiabatique assurant une adaptation mutuelle des diamètres de mode de ladite fibre monomode et dudit tronçon respectivement.
Darbon Philippe
Grard Emmanuel
Alcatel N.v.
Robic
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