A high power thulium doped fiber amplifier (TDFA) with a flat gain bandwidth over 80 nm is proposed and experimentally demonstrated. An output power over 0.67 W and an operation wavelength range from 1960 to 2040 nm have been achieved by employing a dual-stage configuration. The maximum saturated gain is 29 dB and noise figure is lower than 4 dB.

© 2017 Optical Society of America

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