Bismuth-doped fibre amplifiers offer an attractive solution for expanding the bandwidth of fibre-optic telecommunication systems beyond the current C-band (1530-1565 nm). We report a bismuth-doped fibre amplifier in the spectral range from 1370 to 1490 nm, with a maximum gain exceeding 31 dB, and a noise figure as low as 4.75 dB. The developed system is studied for forward, backward, and bi-directional pumping schemes and three different signal power levels. The forward pumping scheme demonstrates the best performance in terms of the achieved noise figure. The developed amplifier can be potentially used as an in-line amplifier with >20dB gain in the spectral band from 1405 to 1460 nm.
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This work was funded from the European Union’s Horizon 2020 research and innovation programmes under the Marie Skłodowska-Curie grant agreement 814276 (WON) and 813144 (REAL-NET). This work was also supported by the ESIF project ETICC and the Russian Science Foundation (Grant No. 17-72-30006).