Ceramics-Silikáty 45 (2) 62-69 (2001)

Properties of optical fiber preforms prepared by inner coating of substrate tubes

V. Matějec, I. Kašík, D. Berková, M. Hayer, M. Chomát, Z. Berka, A. Langrová 

Substrate/deposit high-temperature interactions taking place at the standard MCVD method, MCVD method combined with the solution doping and sol-gel method are experimentally investigated on preform cores composed of (P₂O₅)/GeO₂/SiO₂ glasses and Al₂O₃/P₂O₅/SiO₂ glass matrices doped with Yb and Er ions. Effects of these interaction processes on  the increase of the core radius, the content of dopants in the core and attenuation of fibers are shown. Conditions under which the interaction substantially affects the refractive-index profiles are found by comparing the theoretically estimated and experimentally determined characteristics. Attenuation of optical fibers used in fiber-optic sensors and soliton fiber lasers which have been fabricated on the basis of these results are shown.