Abstract

We prepared a Tm-doped glass composite with a Nd-doped layer as a model 1.4-µm thulium-doped fiber amplifier (TDFA) to investigate the effect of energy transfer on the emission spectra of the composite. The competitive 0.8-µm emission from the Tm:H34 level, which had a branching ratio ten times larger than that of the 1.4-µm emission, was reduced to 1/6 of its previous value by radiative transfer to the Nd layer. Also, the 1.06-µm emission from the excited Nd3+ was found to contribute to the upconversion pumping scheme for population inversion between the H34 and F34 levels of Tm3+. The Nd-doped glass phase can be used as a cladding material for an efficient TDFA.

© 2000 Optical Society of America

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