One-LD-pumped Pr3+-doped fluoride fibre amplifier module with signal gain of 23 dB

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Abstract
The authors have developed a one-LD-pumped praseodymium-doped fluoride fibre amplifier module, based on an efficient, double-pass configuration with an optical circulator. They demonstrate a high gain coefficient of 0.40 dB/mW and a signal gain of 23 dB at 1.30 μm.