Effect of Bismuth Doping on Noise Figure of Er-Doped Silica Fiber

We investigate the spectral and amplification characteristics of Bi/Er co-doped fiber (BEDF) Er-doped (EDF), prepared by atomic layer deposition (ALD). BEDF features a noise figure (NF) below 5.2 dB, bandwidth with NF less than 4 dB is approximately 23 nm (1560–1583 nm), that gain exceeding 25 42 (1525–1567 nm). The quantum conversion efficiency (QCE) at 1550 72.1% pump power 300 mW. saturated output 21.4 dBm. Raman spectra indicate maximum phonon energy lower EDF. fluorescence lifetime 11.64 ms, which longer These results show co-doping Bi ions could increase Er 3+ , reduce NF, improve QCE power. Therefore, this type promising medium for optical amplifiers lasers.