Dispersion compensating optical fiber

G - Physics – 02 – B

Patent

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G02B 6/028 (2006.01) H04B 10/18 (2006.01)

Patent

CA 2231412

The present invention provides a dispersion compensating optical fiber, connected to a transmission single-mode optical fiber having zero dispersion in a 1.3-µm wavelength band, for efficiently compensating for the dispersion of a light signal of a 1.55-µm wavelength band. The refractive index configuration is such that the refractive index profile is a W type and that the dispersion value is a high negative value of not more than -80. The ratio Ra (Ra=a/b) of the diameter a of a core 1 and the diameter b of a side core 2 is set within a range of not less than 0.33 and not more than 0.37. The ratio DPS (SMF) /DPS (DCF) of a value DPS (SMF) obtained by dividing the dispersion value of the transmission single-mode optical fiber in the 1.55-µm wavelength band by the dispersion slope of the transmission single-mode optical fiber in the 1.55-µm wavelength to a value DPS (DCF) obtained by dividing the dispersion value of the dispersion compensating optical fiber in the 1.55-µm wavelength band by the dispersion slope of the dispersion compensating optical fiber in the 1.55-µm wavelength band is set within a range of not less than 0.95 and not more than 1.05.

La présente invention est une fibre optique de correction de la dispersion qui est connectée à une fibre optique monomode sans dispersion dans une bande de longueurs d'onde centrée à 1,3 µm pour corriger de façon efficace la dispersion dans un signal lumineux se trouvant dans une bande de fréquences centrée à 1,55 µm. Le profil de l'indice de réfraction est du type W et la dispersion a une grande valeur négative qui ne dépasse pas -80. Le rapport Ra (Ra = a/b) du diamètre a de l'âme 1 au diamètre b de la gaine 2 est strictement limité entre 0,33 et 0,37. Le rapport DPS (SMF)/DPS (DCF) entre la valeur DPS (SMF) obtenue en divisant la dispersion de la fibre optique monomode de transmission dans la bande de longueurs d'onde centrée à 1,55 µm par la pente de dispersion de cette même fibre optique, et la valeur DPS (DCF) obtenue en divisant la dispersion de la fibre optique de correction de la dispersion dans la bande de longueurs d'onde centrée à 1,55 µm par la pente de dispersion de cette même fibre optique est strictement fixée dans la gamme allant de 0,95 à 1,05.

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