xMnO (100x)As_2O_3TeO_2 glass system, with 0≤x≤50mol , was prepared and investigated by FT-IR and Raman spectroscopies in order to determine its structure and the changes induced by the increasing of MnO content. The results offered by FT-IR and Raman spectroscopies suggest a structure formed by AsO_3, TeO_4 tbp and TeO_3 tp units. The presence of MnO_2 units was confirmed by FT-IR spectra only for high concentration of MnO.
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