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US 2003/0190127 A1Published application
Dispersion-compensating fiber using a higher-order mode
AssigneeAlcatel
InventorsPierre Sillard, Lionel Expert, Pascale Nouchi
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AssigneeAlcatel
InventorsPierre Sillard, Lionel Expert, Pascale Nouchi
Estimating the term…
The invention relates to a dispersion-compensating optical fiber for use in wavelength division multiplex transmission systems, said fiber including successively, from the center toward the periphery, a core having a varying index profile and then a cladding having a constant index, enabling the propagation, for a given operating spectral range greater than 30 nm, of at least one higher-order mode in addition to the LP01 fundamental mode, the index profile of the core being determined so that, for said higher mode, and for said operating spectral range, the chromatic dispersion is less than −150 ps/nm.km, the chromatic dispersion slope is negative, the effective area is greater than 40 μm2, the difference between the wavelength corresponding to the overall minimum chromatic dispersion outside the operating spectral range and the wavelength corresponding to the upper limit of the operating spectral range is greater than 35 nm, and the relative variation of the dispersion slope over the operating spectral range has an absolute value less than 30%.
A dispersion-compensating optical fiber for use in wavelength division multiplex transmission systems, said fiber comprising successively, from its center towards its periphery, a core having a varying index profile and then cladding having constant index, making it possible, for a given operating spectral range greater than 30 nm, for one or more higher-order modes to propagate in addition to the LP01 fundamental mode, the index profile of the core being determined so that, for said higher mode, and for said operating spectral range, firstly, its chromatic dispersion is less than −150 ps/nm.km, secondly, its chromatic dispersion slope is negative, thirdly, its effective area is greater than 40 μm2, fourthly, the difference between the wavelength corresponding to the overall minimum chromatic dispersion outside said operating spectral range and the wavelength corresponding to the upper limit of said operating spectral range is greater than 35 nm, and, fifthly, the relative variation of the dispersion slope over said operating spectral range, i.e. the quotient obtained by taking the difference between the maximum chromatic dispersion slope over said operating spectral range and the minimum chromatic dispersion slope over said operating spectral range and dividing that difference by the average chromatic dispersion slope over said operating spectral range, has an absolute value less than 30%.
A dispersion-compensating optical fiber according to either preceding claim, characterized in that the index profile of the core is determined so that, for said higher mode, and for said operating spectral range, the difference between the wavelength corresponding to the overall minimum chromatic dispersion out of said operating spectral range and the wavelength corresponding to the upper limit of said operating spectral range is greater than 50 nm.
A dispersion-compensating optical fiber according to any preceding claim, characterized in that the index profile of the core is determined so that, for said higher mode, and for said operating spectral range, the chromatic dispersion is less than −300 ps/nm.km.
A dispersion-compensating optical fiber according to any preceding claim, characterized in that the higher-order mode is the LP02 mode.
A dispersion-compensating optical fiber according to any preceding claim, characterized in that the operating spectral range is the C band from 1530 nm to 1565 nm.
A dispersion-compensating optical fiber according to any preceding claim, characterized in that the index profile of the core has at least four sections.
A dispersion-compensating optical fiber according to any preceding claim, characterized in that said dispersion-compensating optical fiber has an attenuation lower than 1.5 dB/km at a wavelength of 1550 nm.
A chromatic dispersion-compensating module, characterized in that said module (3) includes a dispersion-compensating optical fiber (4) according to any preceding claim.
Dependencies are inferred from the claim text.