Enhancement of fluorescence emission and signal gain at 1.53 µm in Er³⁺/Ce³⁺ co-doped tellurite glass fiber

Abstract

Er³⁺/Ce³⁺ co-doped tellurite glasses with composition of TeO₂-GeO₂-Li₂O-Nb₂O₅ were prepared using conventional melt-quenching technique for potential applications in Er³⁺-doped fiber amplifier (EDFA). The absorption spectra, up-conversion spectra and 1.53 µm band fluorescence spectra of glass samples were measured. It is shown that the 1.53 µm band fluorescence emission intensity of Er³⁺-doped tellurite glass fiber is improved obviously with the introduction of an appropriate amount of Ce³⁺, which is attributed to the energy transfer (ET) from Er³⁺ to Ce³⁺. Meanwhile, the 1.53 µm band optical signal amplification is simulated based on the rate and power propagation equations, and an increment in signal gain of about 2.4 dB at 1 532 nm in the Er³⁺/Ce³⁺ co-doped tellurite glass fiber is found. The maximum signal gain reaches 29.3 dB on a 50 cm-long fiber pumped at 980 nm with power of 100 mW. The results indicate that the prepared Er³⁺/Ce³⁺ co-doped tellurite glass is a good gain medium applied for 1.53 µm broadband and high-gain EDFA.

Keywords

Glass Sample / Amplify Spontaneous Emission / Excited State Absorption / Tellurite Glass / Radiative Transition Probability

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This work has been supported by the National Natural Science Foundation of China (No.61177087), the Graduate Innovative Scientific Research Project of Zhejiang Province (No.YK2010048), the Scientific Research Foundation of Graduate School of Ningbo University (No.G13035), and K. C. Wong Magna Fund and Hu Lan Outstanding Doctoral Fund in Ningbo University.