Patent ID: 7327921

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