Patent ID: 7336876
Filing Date: 2008-02-26
Classification: G02B,H04B

Abstract:
1. Chromatic dispersion-compensating optical fibre in 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 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 the chromatic dispersion to chromatic dispersion slope ratio is less than 130 nm, and thirdly an effective area is greater than 50 μm 2 , and, the wavelength corresponding to a global chromatic dispersion minimum is between 1530 nm and 1580 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, and a third peripheral slice having a maximum index less than the maximum index of the central slice; and wherein a value of twice an integral  of a product of an index difference relative to the cladding times the radius, between a zero radius and a radius (r