Use of alumina nanoparticles for preparation of erbium-doped fibers

It has been found that optical fibers doped in the core with alumina nanoparticles and erbium ions have approx. three-times lower base-line attenuation than the fibers prepared from a solution of aluminium chloride by using the conventional solution-doping technique. The doping with alumina nanoparticles has not caused a pronounced increase of erbium luminescence at 1530 nm.