The temperature dependences of optical loss and luminescence spectra have been measured in visible and NIR spectral range for Bi-doped silica and Bi-doped germanosilicate fibers for the first time. The temperature dependence of luminescence lifetime for Si-associated active bismuth centers in germanosilicate fiber was measured. It has been revealed, that distribution of Bi3+ ions across the fiber preform is essentially different as compared to that of NIR active bismuth centers. Data received indicates that NIR-active centers are associated with the low oxidation state of bismuth ion and/or oxygen deficient center of the glass structure.
@article{arxiv.1201.5704,
title = {Thermal behavior of NIR active centers in Bi-doped optical fibers},
author = {D. A. Dvoretsky and I. A. Bufetov and V. V. Vel'miskin and A. S. Zlenko and V. F. Khopin and S. L. Semenov and A. N. Guryanov and L. K. Denisov and E. M. Dianov},
journal= {arXiv preprint arXiv:1201.5704},
year = {2012}
}