A 1.47 μm band optical amplifier using Tm3+ doped fluoride fibre pumped by a 1.064 μm laser was demonstrated. A small signal gain of 25 dB and a saturated output power of over +10 dBm were observed at 1.470 μm for a pump power of 450 mW. The amplification bandwidth was approximately 65nm from 1.440 to 1.505 μm.
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Komukai et al. (1993) studied this question.