Characteristics of diode-pumped Er-doped and Er–Pr-codoped ZBLAN fiber amplifiers were investigated at the wavelength range. An amplified signal of was obtained from the singly Er-doped amplifier for an input signal of , corresponding to a net gain of . An amplified signal of was obtained from the Er–Pr-codoped amplifier for an input signal of , corresponding to a net gain of . It is found that the gain bandwidth of the singly Er-doped amplifier is much narrower than that of the Er–Pr-codoped amplifier. Small gain, no gain, or even a loss for shorter-wavelength signals propagating through the singly Er-doped amplifier should attribute for the large number residual populations in the lower laser level caused by the inefficient depopulation of the energy transfer upconversion processes.
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