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For the first time, a >10W single-mode Tm-doped amplifier is demonstrated. The all fiber format is optimized for single frequency signals in the 1800 -2020 nm band. Natural Tm 3+ gain bandwidth is shifted towards the 1800nm and 2000 nm region by selecting the fiber composition and length. No SBS-related issues were observed at levels of >10W of output power while using a single-frequency seed source. A simple model allowing the prediction of amplifier gain is presented.

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Reduction of noise in photoconductive cellssilicon or germarium of 50 0 cm resistivity, 2 cm long and 1 mm square cross-section. R, = 10000 a, Rpl = 100 0,