Abstract
Characteristics of diode-pumped Er-doped and Er-Pr-codoped ZBLAN fiber amplifiers were investigated at the 2.7-2.8 μm wavelength range. An amplified signal of 4.6 W was obtained from the singly Er-doped amplifier for an input signal of 110 mW, corresponding to a net gain of 16.2 dB. An amplified signal of 2.65 W was obtained from the Er-Pr-codoped amplifier for an input signal of 70 mW, corresponding to a net gain of 15.8 dB. 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.
Original language | English (US) |
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Pages (from-to) | 1578-1580 |
Number of pages | 3 |
Journal | Optics letters |
Volume | 33 |
Issue number | 14 |
DOIs | |
State | Published - Jul 15 2008 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics