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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.
We present characterization of an optical fiber amplifier based on a newly developed double-clad erbium- and ytterbium-doped fiber and pumping method, where the pump and signal fibers are directly spliced to the gain fiber.
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