Fig. 6From: Benefit of Rare-Earth “Smart Doping” and Material Nanostructuring for the Next Generation of Er-Doped FibersNon-saturable absorption measurements of optical fibers drawn from Al2O3:Er 3+ NP-doped preforms NP035 and Er 3+-doped standard optical fiber ST035. Inset: zoom at high input power. Lines are guides for the eyeBack to article page