G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 6/02 (2006.01) H04B 10/18 (2006.01) H04J 14/02 (2006.01)
Patent
CA 2237282
An optical fiber [10] is disclosed that is suitable for use in wave-division-multiplex (WDM) systems [700] served by Erbium-doped fiber amplifiers [710]. The fiber has a chromatic dispersion whose absolute magnitude is at least 0.8 ps/(nm-km) over the wavelength region 1530 - 1565 nm, and has a dispersion slopethat is less than 0.05 ps/(nm2-km). This optical fiber exhibits a loss that is less than about 0.20 dB/km and is relatively insensitive to bending; moreover, its effective area exceeds 50 µm2. The optical fiber includes a core of transparent material having a maximum refractive index n1, and a layer of transparent cladding material on the outer surface of said core having a refractive index, n2. The core includes an annular region of transparent material whose minimum refractive index, n3, is depressed with respect to n2. These indexes are constrained by the following equations: 0.50 < (n1 - n2)/n2 < 0.70; and -0.30 < (n3 - n2)/n2 < -0.05. Optical fibers having a low dispersion slope for both positive-dispersion and negative-dispersion applications are shown.
L'invention est une fibre optique [10] pour les systèmes à multiplexage optique [700] qui utilisent des amplificateurs à fibres dopées à l'erbium [710]. La fibre de l'invention a une dispersion chromatique dont la grandeur absolue est de 0,8 ps/(nm-km) pour les longueurs d'onde comprises entre 1530 et 1565 nm, et une pente de dispersion inférieure à 0,05 ps/(nm2-km). Elle a une perte d'affaiblissement inférieure à 0,20 dB/km environ et est relativement insensible aux courbures; son aire efficace est supérieure à 50 µm2. Elle contient une âme faite d'un matériau transparent ayant un indice de réfraction maximum n1, cette âme étant recouverte d'une couche de matériau de gainage transparent ayant un indice de réfraction n2. Cette âme contient une région annulaire faite d'un matériau transparent dont l'indice de réfraction minimum n3 est inférieur à n2. Ces indices sont soumis aux contraintes définies par les équations suivantes : 0,50 < (n1 - n2)/n2 < 0,70 et -0,30 < (n3 - n2)/n2 < -0,05. Des fibres optiques à faible pente de dispersion pour applications à dispersion positive et à dispersion négative sont illustrées.
Kirby Eades Gale Baker
Lucent Technologies Inc.
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