Abstract
Rare-earth doped heavy metal germanium tellurite (NZPGT) glass fibers with lower maximum phonon energy of and UV-sensitivity property have been designed and fabricated. Bright and compact upconversion traces have been observed in and 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 codoped NZPGT glasses present a broad emission at with the FWHM of , and the maximum internal gain of with a remarkable gain coefficient of in the C-band were achieved in a codoped NZPGT glass fiber. The efficient three-photon blue and two-photon near-IR upconversion emissions of a codoped NZPGT glass fiber demonstrate that low phonon energy NZPGT glasses have promising potential applications in single-doped glass fibers for S-band signal amplification, and the further development of O- and U-band fiber amplifiers and lasers in and doped NZPGT glass fibers.
© 2011 Optical Society of America
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