Dispersion-shifted fiber

G - Physics – 02 – B

Patent

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G02B 6/036 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2229280

The present invention provides a dispersion-shifted fiber which can effectively restrain nonlinear optical effects from occurring and is suitable for long-haul transmission. As characteristics at a wavelength of 1,550 nm, this dispersion-shifted fiber has a dispersion whose absolute value is from 1.0 to 4.5 ps/nm/km, an effective core cross-sectional area of at least 70 µm2, a cutoff wavelength of at least 1,300 nm at a fiber length of 2 m, and a dispersion slope of 0.05 to 0.09 ps/nm2/km. Also, in this dispersion-shifted fiber, the position where the optical power distribution in the fundamental mode of the signal light is maximized is radially separated from the center of the core region by a predetermined distance, and, when the optical power in the fundamental mode of signal light at the center of core region is P0 and the maximum value of the optical power distribution in the fundamental mode is P1, the maximum value P1 is greater than the value of 1.2 times the optical power P0 at the center of core region.

Fibre à dispersion décalée capable de limiter efficacement l'apparition d'effets optiques non linéaires et dont la configuration convient pour la transmission à grande distance. La fibre comporte diverses caractéristiques à une longueur d'onde de 1 550 nm : un niveau de dispersion de 1,0 à 4,5 ps/nm/km en valeur absolue, une section de coeur efficace d'au moins 70 µm2, une longueur d'onde critique d'au moins 1 300 nm pour une longueur de fibre de 2 m et une pente de dispersion de 0,05 à 0,09 ps/nm2/km. En outre, dans cette fibre à dispersion décalée, la position maximisant la distribution de puissance optique en mode fondamental de la lumière de signal est séparée radialement du centre de la région du coeur suivant une distance prédéterminée et, lorsque la puissance optique en mode fondamental de la lumière de signal au centre de la région du coeur est P0, et la valeur maximale de la distribution de puissance optique en mode fondamental est P1, la valeur maximale P1 est supérieure à la valeur de 1,2 fois la puissance optique P0 au centre de la région du coeur.

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