Patent ID: 7095932

Claim:
A single-mode chromatic dispersion compensating optical fiber for a wavelength multiplexing transmission network, having a chromatic dispersion C at a central wavelength of a spectral band used which is less than −50 ps/nm-km, having a chromatic dispersion slope C′ at said central wavelength which is negative, having a ratio of chromatic dispersion to chromatic dispersion slope C/C′ at said central wavelength which is less than 600 nm, successively comprising, from the center towards the periphery, a core having a variable index profile, then a cladding of constant index, characterized in that the variable index profile of the core comprises at least six slices ( 1 to 6 ) among which successively from the center towards the periphery, a central slice ( 1 ) whose maximum index is greater than the index of the cladding, the difference Dn 1 between the maximum index of the central slice and the index of the cladding being greater than 13.10 −3 , a first burried slice ( 2 ) whose minimum index is lower than the index of the cladding, the difference Dn 2 between the minimum index of the first burried slice and the index of the cladding being less than −4.10 −3 , a first annular slice ( 3 ) whose maximum index is greater than the index of the cladding and less than the maximum index of the central slice, the difference Dn 3 between the maximum index of the first annular slice and the index of the cladding being greater than 2.5.10 −3 , a second burried slice ( 4 ) whose minimum index is less than the index of the cladding, the difference Dn 4 between the minimum index of the second burried slice and the index of the cladding being less than −2.10 −3 , a second annular slice ( 5 ) whose maximum index is greater than the index of the cladding and less than a maximum index of the central slice, the difference Dn 5 between the maximum index of the second annular slice and the index of the cladding being greater than 2.10 −3 , a third burried slice ( 6 ) whose minimum index is lower than the index of the cladding, the difference Dn 6 between the minimum index of the third burried slice and the index of the cladding being less than −1.10 −3 .