Abstract
A series of Er3+/Tm3+ co-doped fluoride (ZBLAN) glasses and fibers was prepared and their fluorescence spectra was measured under excitation at 793 nm and 980 nm. Correlation between the self-absorption effect of rare-earth ions and the shift of the emission peak was investigated. With the increasing length of fiber, the emission peaks red-shift when self-absorption occurs at the upper level of emission transition or blue-shift when that occurs at the lower level. As a result of the strong self-absorption effect, Er3+/Tm3+ co-doped fibers mainly yield 1390–1470, 1850–1980, and 2625–2750 nm emissions when excited at 793 nm, and 1480–1580, 1800–1980, and 2625–2750 nm emissions when excited at 980 nm. Further, a broadband emission in the range of 1410–1580 nm covering the S + C communication band was obtained by the dual-pumping scheme of 793 nm and 980 nm. Results suggest that the dual-pumping scheme would be more effective and important for an Er3+/Tm3+ co-doped fiber amplifier working in the S + C communication band.
Highlights
In recent decades, Er3+ /Tm3+ co-doped glasses such as tellurite [1], germanate [2], and bismuthate glasses [3] have been extensively investigated
Er3+ /Tm3+ co-doped glasses have the potential to be drawn into fibers as amplifiers for wavelength division multiplexing (WDM) systems [4,5,6,7]
A logical approach to achieving broadband gain covering the S + C band is to dope with both Er3+ and Tm3+ [13,14,15,16]
Summary
Er3+ /Tm3+ co-doped glasses such as tellurite [1], germanate [2], and bismuthate glasses [3] have been extensively investigated. A logical approach to achieving broadband gain covering the S + C band is to dope with both Er3+ and Tm3+ [13,14,15,16]. Other rare-earth doped glasses are yet to be drawn into fiber. A series of Er3+ /Tm3+ -doped ZBLAN glasses with different concentrations and 0.2 mol % Er3+ –1.2 mol % Tm3+ co-doped ZBLAN fibers of different lengths were prepared. Their fluorescence spectra were measured under excitation at 793 nm and 980 nm. Spectral differences between glasses and fibers, as well as the energy transfer mechanisms. 1410–1580 nmand covering the S + C communication band is obtained by the dual-pump scheme of 793 nm and 980 nm
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