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The fabrication of Er-doped ZrO2-based nanocrystalline phase-separated silicaoptical preforms by the MCVD and solution doping techniques is presented.Fabricated preform cores are nearly transparent and contain phase-separatedrare-earth doped nanocrystalline particles with diameters mainly in a rangefrom 20 to 80 nm. High concentrations of erbium and aluminium in preform coresof about 0.3 and 14 mol%, respectively have been achieved without defects onthe core-cladding interface. Spectral losses in a range 800-1600 nm andfluorescence spectra of erbium ions around 1550 nm measured on a fibre drawnfrom the preform are reported.

Preparation and Properties of Er-Doped ZrO2 Nanocrystalline Phase-Separated Preforms of Optical Fibers by MCVD Process