We prepared a Tm-doped glass composite with a Nd-doped layer as a model thulium-doped fiber amplifier (TDFA) to investigate the effect of energy transfer on the emission spectra of the composite. The competitive emission from the level, which had a branching ratio ten times larger than that of the emission, was reduced to 1/6 of its previous value by radiative transfer to the Nd layer. Also, the emission from the excited was found to contribute to the upconversion pumping scheme for population inversion between the and levels of . The Nd-doped glass phase can be used as a cladding material for an efficient TDFA.
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