FIBEROPTIC AMPLIFYING AND MANUFACTORING PROCESS

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An amplifying optical fibre comprising a central core (10) suitable for transmitting and amplifying an optical signal, and an optical cladding (11) surrounding the central core and suitable for confining the optical signal transmitted in the core, the central core being formed by a main matrix and containing nanoparticles (5) doped with a rare earth. The concentration by weight of the rare earth dopants in each nanoparticle is comprised between 1 and 20% by weight (wt.%), and the concentration of the nanoparticles in the main matrix of the central core is comprised between 0.05% and 1% by volume. Such an optical fibre incorporates rare earth ions at a high concentration whilst avoiding the phenomenon of photo-darkening at high power.