Alcatel

Draka Comteq B.v.

Isabelle Bongrand

Lionel Provost

Dominique Bayart

Christian Simonneau

Carlos Luis De Barros

Laurent Gasca

Christine Moreau

Philippe Bousselet

The invention relates to the field of dispersion managed optical fibres for use in wavelength division multiplex transmission networks. A multimode optical fibre in which at least one higher-order mode can be propagated, is constituted radially by a single central core surrounded by an optical cladding (), and comprises, for said higher mode or for at least one of said higher-order modes, positive chromatic dispersion optical fibre portions (D+) alternating longitudinally with negative chromatic dispersion optical fibre portions (D&#x2212;).

Dispersion managed HOM multimode optical fibre

An optical fiber amplifier is considered comprising a mono-mode core, a first cladding around said core and at least a further cladding around said first cladding while said first cladding includes a ring shaped active region doped with rare earth material surrounding said mono-mode core. Advantageously, the first cladding is designed with a radial refractive index following an almost continuous decreasing function for increasing radius. The use of a continuously decreasing refractive index for the cladding at the outer border of the ring shaped active medium optimize the efficiency of the coupling between the core and the cladding.

Enhanced pump absorbing double-clad fiber

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Cannes, France

Isabelle Bongrand