Dispersion compensation optical fiber and optical...

G - Physics – 02 – B

Patent

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G02B 6/036 (2006.01)

Patent

CA 2340948

A dispersion compensation optical fiber having a small dispersion in the 1.5 µm and 1.3 µm bands. A first side core (2), a second side core (3), and a clad (5) are provided in this order on the outer periphery of a center core (1). The relationship among the relative refractive-index difference .DELTA.1 of the center core (1) to the clad (5), the relative refractive-index difference .DELTA.2 of the first side core (2) to the clad (5), and the relative refractive-index difference .DELTA.3 of the second side core (3) to the clad (5) is expressed by .DELTA.1~.DELTA.3~.DELTA.2, 0. 8%<=$s(D)1.3%, - 0.5<=2/$s(D)1<=-0.35, 0.2% <= $s(D) 3 <= 0.3%. The continued ratio of diameter between the center core (1) and the first and second side cores (2, 3) is (1:2 to 2.5) : (2.5 to 3.5). The dispersion compensation optical fiber is connected to a single-mode optical fiber. The dispersion of the optical fiber after the connection in the 1.5 $s(m)m wavelength band is -1 to 1 ps / nm / km, and that in the 1.3 $s(m)m wavelength band is -5 to 5 ps / nm / km. An optical transmission line comprising such a dispersion compensation optical fiber is also disclosed.

Cette invention concerne une fibre optique à compensation de dispersion caractérisée par une faible dispersion dans les bandes de 1,5 µm et 1,3 µm. A partir d'une âme centrale (1), on trouve successivement, en allant vers la périphérie, une première couche (2), une deuxième couche (3) et une gaine (5). Les rapports d'indices de réfraction .DELTA.1b entre l'âme centrale (1) et la gaine (5), .DELTA.2 entre la première couche (2) et la gaine (5), et .DELTA.3 entre la deuxième couche (3) et la gaine (5) sont tels que .DELTA.1~.DELTA.2~.DELTA.3, 0,8 %<=.DELTA.1<=1,3 %, -0,5<= .DELTA.2/.DELTA.1<=-0,35, 0,2 %<=.DELTA.3<=0,3 %. Le rapport continu de diamètre entre l'âme centrale (1) et les première et deuxième couches (2, 3) est (1 :2 à 2,5) : (2,5 à 3,5). La fibre optique à compensation de dispersion est connectée à une fibre optique monomode. La compensation de dispersion de la fibre optique après connexion est comprise entre 1 et 1 ps / nm / km dans la longueur d'onde de 1,5 µm, et entre 5 et 5 ps / nm / km dans la longueur d'onde de 1,3 µm. L'invention porte également sur une ligne de transmission optique comportant une telle fibre optique à compensation de dispersion.

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