Low-dispersion optical fiber and optical transmission system...

Details Low-dispersion optical fiber and optical transmission system... Low-dispersion optical fiber and optical transmission system...

G - Physics

02

B

G02B 6/036 (2006.01) G02B 6/02 (2006.01)

Patent

CA 2368327

A lower-dispersion optical fiber achieving both low wavelength dispersion in the usable wavelength region and enlarged effective core cross-section. The outer peripheral face of a center core (1) of the lower dispersion optical fiber is covered with a first side core (2) the outer peripheral face of the first side core (2) is covered with a second side core (3), and the outer peripheral face of the second side core (3) is covered with a clad (5). If the maximum refractive index of the center core (1) is n1, the minimum refractive index of the first side core (2) is n2, the maximum refractive index of the second side core (3) is n3, and the refractive index of the clad (5) is nc, a relation n1 > n3 > nc > n2 is satisfied. The relative refractive-index differences .DELTA.1, .DELTA.2, and .DELTA.3 of the maximum refractive index of the center core (1), and the minimum refractive index of the first side core (2) to tose of the clad (5) are, respectively, in the ranges of 0.4 % <= .DELTA.1 <= 0.7 %, -0.30 % <= .DELTA.2 <= -0.05 %, and 0.2 % <= .DELTA.3.

L'invention porte sur une fibre optique à faible dispersion caractérisée à la fois par sa faible dispersion en longueur d'ondes dans la zone des longueur d'ondes utiles, et par la section transversale efficace plus importante du coeur. La face périphérique extérieure du coeur central (1) de ladite fibre est recouverte d'un premier coeur latéral (2), la face périphérique extérieure du premier coeur latéral (2) est recouverte d'un deuxième coeur latéral (3), et la face périphérique extérieure du deuxième coeur latéral (3) est recouverte d'une gaine (5). L'indice de réfraction maximal du coeur central (1) étant n1, l'indice de réfraction minimal du premier coeur latéral (2) étant n2, l'indice de réfraction maximal du deuxième coeur latéral (3) étant n3, et l'indice de réfraction de la gaine (5) étant nc, la relation n1 > n3 > nc > n2 est satisfaite. Les différences relatives des indices de réfraction .DELTA.1, .DELTA.2 et .DELTA.3, de l'indice de réfraction maximal du coeur central (1) et de l'indice de réfraction minimal du premier coeur latéral (2), avec celui de la gaine (5) se situent respectivement dans les plages suivantes: 0,4 % <= .DELTA.1 <= 0,7 %; -0,30 % <= .DELTA.2 <= -0,05 %; et 0,2 % <= .DELTA.3.

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