Negative-dispersion optical fiber and optical transmission...

G - Physics – 02 – B

Patent

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G02B 6/00 (2006.01) G02B 6/036 (2006.01) G02B 6/34 (2006.01) H04B 10/18 (2006.01)

Patent

CA 2421125

The present invention concerns a negative-dispersion optical fiber for compensating in a shorter length for chromatic dispersion of a positive- dispersion optical fiber in a signal wavelength band, and an optical transmission line incorporating it. The negative-dispersion optical fiber has the following properties at the wavelength of 1550 nm; chromatic dispersion D of not more than -150 ps/nm/km; a dispersion slope satisfying such a condition that a ratio thereof (S/D) to the chromatic dispersion D is not less than 2.0 X 10-3/nm nor more than 4.7 X 10-3/nm; and an effective area of not less than 12 µm2 but less than 25 µm2. For satisfying these properties, the negative-dispersionoptical fiber has, in the order stated from the center toward the outer periphery, a core region of a maximum refractive index n1, a first cladding of a refractive index n2 ( < n1), a second cladding of a refractive index n3 ( > n2), and a third cladding of a refractive index n4 ( < n3).

La présente invention concerne une fibre optique à dispersion négative compensant en un laps de temps réduit la dispersion chromatique d'une fibre optique à dispersion positive dans une bande signal de longueur d'onde, et une ligne de transmission optique dotée de ladite fibre. La fibre optique à dispersion négative possède les caractéristiques suivantes à une longueur d'onde de 1550 nm : dispersion chromatique D de -150 ps/nm/km maximum; courbe de dispersion telle que le rapport (S/D) par rapport à la dispersion chromatique D est d'au moins 2.0 X 10?-3¿/nm et de 4.7 X 10?-3¿/nm maximum; et la surface effective d'au moins 12 µm?2¿, mais pas plus de 25 µm?2¿. Pour satisfaire ces exigences, la fibre optique à dispersion négative présente, dans l'ordre indiqué en partant du centre vers la périphérie, une région centrale dont l'indice de réfraction maximum est de n¿1?, une première gaine à indice de réfraction n¿2? (<n¿1?), une deuxième gaine à indice de réfraction de n¿3? (<n¿2?), et une troisième gaine à indicede réfraction de n¿4? (<n¿3?).

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