Rare-earth-doped optical fiber

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An optical fiber (1) comprises a core (90) and an optical cladding (200). The core (90) is constituted by a core matrix (100) containing nanoparticles (110). The nanoparticles (110) are constituted by a nanoparticle matrix (120) surrounded by an outer layer. The nanoparticle matrix (120) includes doping atoms from the group of rare earths (130) at a concentration such that the atom ratio between the number of nanoparticle matrix (120) atoms other than oxygen and the number of atoms of rare earths (130) lies in the range 300 to 1000. The outer layer consists in an outer layer matrix that is substantially free from any atom of rare earths (130), and has thickness lying in the range 1 nm to 2 nm. Such an optical fiber serves to attenuate pair-induced quenching (PIQ) mechanisms and homogeneous up conversion (HUC) mechanisms.