Abstract
By using in situ temperature-dependent Raman spectroscopy, we systematically study the annealing properties of photosensitive single-mode fibers and report on microstructural changes in Ge:SiO2 fiber glass as a function of time for thermal cycle between ambient temperature and 1000°C. We clearly observe the fiber core-structural relaxation during annealing as well as the temperature dependence of the vibrational band obtained with peak deconvolution, and it thereby enables one to explain thermal expansion effect independently, with the remaining possible challenge to extract the thermo-optic coefficient. This is particularly interesting for a detailed, microscopic understanding and improving optical properties of glass fibers at an elevated temperature.
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