Abstract

Heavily Er-doped fibers (EDFs) based on P2O5Al2O3SiO2 (PAS) ternary glass have been studied. A unique feature of this glass is the formation of a AlPO4 join having a structure similar to that of SiO2 glass and a refractive index below it. It is found that the Er3+ absorption and emission spectra in the PAS EDFs are defined by the dopant (Al2O3 or P2O5) present in excess and are close to those of the corresponding binary glass (Al2O3SiO2 or P2O5SiO2). The presence of the AlPO4 join results in the enhancement of the pump-to-signal conversion efficiency in the PAS EDFs as compared with the EDFs based on the P2O5SiO2 and Al2O3SiO2 (with 1.5mol.% Al2O3 and less) binary glasses. The PAS host glass is advantageous in the case of large-mode-area active fibers.

© 2009 Optical Society of America

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