Abstract

Rare-earth doped heavy metal germanium tellurite (NZPGT) glass fibers with lower maximum phonon energy of $793{\mathrm{cm}}^{-1}$ and UV-sensitivity property have been designed and fabricated. Bright and compact upconversion traces have been observed in ${\mathrm{Er}}^{3+}/{\mathrm{Yb}}^{3+}$ and ${\mathrm{Tm}}^{3+}/{\mathrm{Yb}}^{3+}$ codoped NZPGT glass fibers, which exhibit favorable flexibility and excellent thermal stability, indicating that the NZPGT glasses are a desirable candidate for fiber amplifiers. The ${\mathrm{Er}}^{3+}/{\mathrm{Yb}}^{3+}$ codoped NZPGT glasses present a broad emission at $~1.5\mathrm{\mu m}$ with the FWHM of $72.7\mathrm{nm}$, and the maximum internal gain of $12.59\mathrm{dB}$ with a remarkable gain coefficient of $2.38\mathrm{dB}/\mathrm{cm}$ in the C-band were achieved in a ${\mathrm{Er}}^{3+}/{\mathrm{Yb}}^{3+}$ codoped NZPGT glass fiber. The efficient three-photon blue and two-photon near-IR upconversion emissions of a ${\mathrm{Tm}}^{3+}/{\mathrm{Yb}}^{3+}$ codoped NZPGT glass fiber demonstrate that low phonon energy NZPGT glasses have promising potential applications in ${\mathrm{Tm}}^{3+}$ single-doped glass fibers for S-band signal amplification, and the further development of O- and U-band fiber amplifiers and lasers in ${\mathrm{Pr}}^{3+}$ and ${\mathrm{Ho}}^{3+}$ doped NZPGT glass fibers.

© 2011 Optical Society of America

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