Patent ID: 6912348
Filing Date: 2005-06-28
Classification: G02B,H04B

Abstract:
1. 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, wherein, for a given operating spectral range greater than 30 nm, for one or more higher-order modes to propagate in addition to the LP 01 fundamental mode, the index profile of the core is structured so that, for said higher mode, and for said operating spectral range, firstly, the chromatic dispersion is less than −150 ps/nm.km, secondly, the chromatic dispersion slope is negative, thirdly, the effective area is greater than 40 μm 2 , 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, calculated as 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%.