Enhanced 1.32 μm fluorescence and broadband amplifying for O-band optical amplifier in Nd³⁺-doped tellurite glass

Abstract

WO₃ oxides with relatively high phonon energy and different concentrations were introduced into the Nd³⁺-doped tellurite-based glasses of TeO₂-ZnO-Na₂O to improve the 1.32 μm band fluorescence emission. The absorption spectra, Raman spectra, 1.32 μm band fluorescence spectra and differential scanning calorimeter (DSC) curves were measured, together with the Judd-Ofelt intensity parameters, stimulated emission and gain parameters were calculated to evaluate the effects of WO₃ amount on the glass structure and spectroscopic properties of 1.32 μm band fluorescence. It is shown that the introduction of an appropriate amount of WO₃ oxide can effectively improve the 1.32 μm band fluorescence intensity through the enhanced multi-phonon relaxation (MPR) processes between the excited levels of Nd³⁺. The results indicate that the prepared Nd³⁺-doped tellurite glass with an appropriate amount of WO₃ oxide is a potential gain medium applied for the O-band broad and high-gain fiber amplifier.

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This work has been supported by the National Natural Science Foundation of China (No.61178063), the Natural Science Foundation of Ningbo City (No.2016A610061), and the K. C. Wong Magna Fund and Hu Lan Outstanding Doctoral Fund in Ningbo University.