Abstract
Preforms for drawing silica optical fibers have been fabricated by using the MCVD method for the preparation of the optical claddings and the sol-gel method for the preparation of the optical cores consisting of TiO2−SiO2 or RE3+−Al2O3−P2O5−SiO2 (RE=Er, Yb) glasses. A novel method has been developed for depositing thin gel layers on the inner silica tube wall, under rotation of the tube inclined at a small angle to the horizontal. The gel layers have been deposited from sols prepared by mixing Si(OC2H5)4, POCl3, Ti(n-OC4H9)4, AlCl3, ErCl3, YbCl3 H2O, C2H5OH and HCl. The gel layers deposited using these sols on the inner tube wall were heat-treated in a flow of CCl4 or POCl3 with O2 at temperatures of from 800° to 1400°C. After collapsing the composite tube into a preform, an optical fiber has been drawn. The refractive-index profiles of the preforms and the attenuation spectra of the drawn fibers are shown, as well as some results on the lasing characteristics of Yb3+ sensitized, Er3+ doped fibers.
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