Radiation-insensitive optical fiber doped with rare earths

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The invention relates to an optical fiber comprising, from the center toward the periphery : • a central core (11) adapted to transmit and to amplify an optical signal, the central core (11) consisting of a core matrix comprising nanoparticles, the nanoparticles being formed of a nanoparticle matrix comprising dopants from the rare earths group; • an optical cladding surrounding the central core (11) adapted to confine the optical signal transmitted by the central core (11), the optical cladding having a plurality of holes (10) that extend along the length of the optical fiber, the holes (10) being separated from each other by a pitch (Λhole); and • an outer cladding.