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 m2, 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%.
