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AssigneeAlcatel Lucent
InventorsChristian Simonneau, Ekaterina Burov, Sébastien Fevrier
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Device for the emission or amplification of a signal, comprising an optical fibre (1) having a solid core (2) of refractive index nc, made of a silica glass doped with a rare earth, such as erbium, ytterbium or neodymium, said core being surrounded by an optical cladding (3, 4, 5, 6, 7, 8) comprising at least a pair of silica layers composed of a first, inner layer (3), having a refractive index greater than the refractive index nc of the core (2), covered by a second, outer layer (4). The optical fibre (1) comprises several pairs of silica layers (3, 4; 5, 6; 7, 8) around the core (2), each pair comprising an inner layer (3, 5, 7) of refractive index ni and an outer layer (4, 6, 8) of refractive index ne, the refractive index ne of the outer layer being lower that the refractive index ni of the inner layer of the same pair.
A device comprising a photonic band gap optical fiber comprising a solid core made up of a rare earth-doped silica glass with a refraction index of nc, surrounded by an optical cladding comprising N pairs of silica layers around the core, in which N is a whole number greater than 2, each pair being made up of a first inner layer whose thickness di and refraction index ni are greater than the refraction index nc of the core, covered by a second outer layer with thickness de and refraction index ne, the refraction index ne of the outer layer being less than the refraction index ni of the inner layer of the same pair,
Dependencies are inferred from the claim text.