Patent ID: 7369732

Claim:
Chromatic dispersion-compensating optical fibre in an S-band extending from 1460 nm to 1530 nm, for a wavelength multiplexing transmission system, comprising successively, from a centre to a periphery, a core having a variable index profile and then a cladding of constant index, enabling a propagation, at a wavelength of 1495 nm, in addition to a fundamental mode LP 01 , of at least one higher order mode, the index profile of the core being determined in such a manner that, for said higher mode, at a wavelength of 1495 nm, firstly a chromatic dispersion is less than -150 ps/nm-km, secondly a chromatic dispersion to chromatic dispersion slope ratio is between 200 nm and 300 nm, and thirdly an effective area is greater than 60 μm 2 , and, a wavelength corresponding to a global chromatic dispersion minimum is between 1550 nm and 1600 nm; wherein the variable index profile of the core comprises successively, from the centre to the periphery, a central slice having a maximum index higher than the index of the cladding, a first peripheral slice having a maximum index less than the maximum index of the central slice, a second peripheral slice having a maximum index less than the maximum index of the central slice, a third peripheral slice having a maximum index less than the maximum index of the central slice, and wherein a value of the integral ( S 01 = ∫ 0 r1 ⁢ Δ ⁢ ⁢ n ⁡ ( r ) ⁢ ⁢ ⅆ r ) of an index difference relative to the cladding, between a zero radius and a radius (r 1 ) of a portion of the central slice having an index higher than the index of the cladding, is between 100.10 −3 and 115.10 −3 μm.