Promising candidates for optical amplification in the S-band are the Thulium-doped fibre amplifiers (TDFAs). Presently a majority of the DFA modules is based on fluoride Tm-doped fibres with low-photon energy. However, usage of fluoride fibres results indifficulties with fabrication and robustness of the host material and they are incompatible with standard telecomunication fibres. In the project, silica.based TDFs with novel composition of the fiber core will be studied. Compehensive spectraly, spatially and time resolved numerical model of the TDF will be developed. Several methods for modification of the local environment of thulium will be investigated. Prepared TDFs will be characterized spectroscopically using Judd-Ofelt analysis and fluorescence decay measurements. The numerical model will be used for explanation of energy upconversion processes in Thulium and for optimization of TDFA parameters. Performance of the developed fibres in experimental TDFA will be tested.
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