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US 5,878,182 AGranted
Optical fiber having a low-dispersion slope in the erbium amplifier region
AssigneeLucent Technologies Inc.
InventorDavid W. Peckham
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AssigneeLucent Technologies Inc.
InventorDavid W. Peckham
Estimating the term…
An optical fiber is disclosed that is suitable for use in wave-division-multiplex (WDM) systems served by Erbium-doped fiber amplifiers. 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 slope that is less than 0.05 ps/(nm.sup.2 -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 .mu.m.sup.2. The optical fiber includes a core of transparent material having a maximum refractive index n.sub.1, and a layer of transparent cladding material on the outer surface of said core having a refractive index n.sub.2. The core includes an annular region of transparent material whose minimum refractive index, n.sub.3, is depressed with respect to n.sub.2. These indexes are constrained by the following equations: 0.50<(n.sub.1 -n.sub.2)/n.sub.2 <0.70; and -0.30<(n.sub.3 -n.sub.2)/n.sub.2 <-0.05.
An optical fiber having a chromatic dispersion whose absolute magnitude is greater than about 0.8 ps/(nm-km) for all wavelengths within the region 1530-1565 nm, the optical fiber comprising a core of transparent material having a maximum refractive index n.sub.1, and a layer of transparent cladding material on the outer surface of said core having a minimum refractive index of n.sub.2
A silica-based optical waveguide fiber having a material dispersion, and having a refractive-index profile preselected to generate a negative waveguide dispersion such that the overall dispersion of said fiber, equal to the sum of said material dispersion and said waveguide dispersion, has a slope that is less than 0.05 ps/(nm.sup.2 -km), and has a chromatic dispersion that is greater than about +0.8 ps/(nm-km) at a given wavelength within the region 1530-1565 nm.
A silica-based optical waveguide fiber having a material dispersion, and having a refractive-index profile preselected to generate a negative waveguide dispersion such that the overall dispersion of said fiber, equal to the sum of said material dispersion and said waveguide dispersion, has a slope that is less than 0.05 ps/(nm.sup.2 -km), and has a chromatic dispersion that is more negative than about -0.8 ps/(nm-km) at a given wavelength within the region 1530-1565 nm, said fiber attenuating light transmitted along its length, the attenuation of said fiber at 1550 nm being no greater than 0.20 dB/km.
A communications cable comprising a plurality of optical fibers enclosed within a sheath system that includes a plastic jacket, each of said fibers having an overall chromatic dispersion whose magnitude exceeds +0.8 ps/(nm-km) over the entire wavelength region 1530-1565 nm
A communications cable comprising a plurality of optical fibers enclosed within a sheath system that includes a plastic jacket, each of said fibers having an overall chromatic dispersion whose absolute magnitude exceeds 0.8 ps/(nm-km) in the wavelength region 1530-1565 nm
A wave-division-multiplex (WDM) system comprising:
Dependencies are inferred from the claim text.