High-gain ultra-wideband bismuth-doped fiber amplifier operating in the O + E + S band Article Swipe

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Materials science Wideband Noise figure Optics dBm Optical amplifier Optoelectronics Amplifier Bandwidth (computing) Bismuth SIGNAL (programming language) Telecommunications Physics Laser CMOS Metallurgy Computer science Programming language

Ziwei Zhai , J. K. Sahu ·

YOU? · · 2024 · Open Access · · DOI: https://doi.org/10.1364/ol.525583 · OA: W4398353371

We present a double-pass bismuth (Bi)-doped fiber amplifier (BDFA) providing high-gain wideband amplification from 1330 to 1480 nm. A peak gain of 38 dB with 4.7 dB noise figure (NF) was obtained at 1420 nm for a −23 dBm input signal, with >20 dB gain from 1335 to 1475 nm. We achieved 30 and 21.5 dB peak gains with 122 nm (1341–1463 nm) and 140 nm (1333–1473 nm) 6 dB-gain bandwidth for −10 and 0 dBm input signal, respectively. For a 0 dBm signal, the power conversion efficiency (PCE) reached 23.7%, and the in-band optical-signal-to-noise ratio (OSNR) across the wideband BDFA was >44 dB. Also, the absorption and luminescence characteristics have been studied for different Bi-doped phosphosilicate fibers (BPSFs) fabricated in-house.