[1] Bufetov I A, Dianov E M. Bi-doped fiber lasers[J]. Laser Physics Letters, 6, 487-504(2009).

[2] Fujimoto Y. Local structure of the infrared bismuth luminescent center in bismuth-doped silica glass[J]. Journal of the American Ceramic Society, 93, 581-589(2010).

[3] Xiao G, Yan B B, Luo Y H et al. Co-doping effect of lead or erbium upon the spectroscopic properties of bismuth doped optical fibres[J]. Journal of Luminescence, 230, 117726(2021).

[4] Dianov E M. Amplification in extended transmission bands using bismuth-doped optical fibers[J]. Journal of Lightwave Technology, 31, 681-688(2013).

[5] Riumkin K E, Melkumov M A, Bufetov I A et al. Superfluorescent 1.44-μm bismuth-doped fiber source[J]. Optics Letters, 37, 4817-4819(2012).

[6] Thipparapu N K, Wang Y, Wang S et al. Bi-doped fiber amplifiers and lasers[J]. Optical Materials Express, 9, 2446-2465(2019).

[7] Bufetov I A, Melkumov M A, Firstov S V et al. Bi-doped optical fibers and fiber lasers[J]. IEEE Journal of Selected Topics in Quantum Electronics, 20, 111-125(2014).

[8] Dianov E M. Bismuth-doped optical fibers: a challenging active medium for near-IR lasers and optical amplifiers[J]. Light: Science & Applications, 1, e12(2012).

[9] Dianov E M. Bismuth-doped optical fibres: a new breakthrough in near-IR lasing media[J]. Quantum Electronics, 42, 754-761(2012).

[10] Bufetov I A, Firstov S V, Khopin V F et al. Bi-doped fiber lasers and amplifiers for a spectral region of 1300–1470 nm[J]. Optics Letters, 33, 2227-2229(2008).

[11] Dianov E M. Nature of Bi-related near IR active centers in glasses: state of the art and first reliable results[J]. Laser Physics Letters, 12, 095106(2015).

[12] Fujimoto Y. Local structure of the infrared bismuth luminescent center in bismuth-doped silica glass[J]. Journal of the American Ceramic Society, 93, 581-589(2010).

[13] Firstov S V, Alyshev S V, Khopin V F et al. Effect of heat treatment parameters on the optical properties of bismuth-doped GeO2∶SiO2 glass fibers[J]. Optical Materials Express, 9, 2165(2019).

[14] Khegai A, Afanasiev F, Ososkov Y et al. The influence of the MCVD process parameters on the optical properties of bismuth-doped phosphosilicate fibers[J]. Journal of Lightwave Technology, 38, 6114-6120(2020).

[15] Wang Y, Thipparapu N K, Richardson D J et al. Ultra-broadband bismuth-doped fiber amplifier covering a 115-nm bandwidth in the O and E bands[J]. Journal of Lightwave Technology, 39, 795-800(2021).

[16] Ososkov Y, Khegai A, Firstov S et al. Pump-efficient flattop O+E-bands bismuth-doped fiber amplifier with 116 nm -3 dB gain bandwidth[J]. Optics Express, 29, 44138-44145(2021).

[17] Donodin A, Dvoyrin V, Manuylovich E et al. Bismuth doped fibre amplifier operating in E- and S- optical bands[J]. Optical Materials Express, 11, 127-135(2020).

[18] Gumenyuk R, Melkumov M A, Khopin V F et al. Effect of absorption recovery in bismuth-doped silica glass at 1450 nm on soliton grouping in fiber laser[J]. Scientific Reports, 4, 7044(2014).

[19] Liao L. Bi-doped glass optical fibers and its ultrabroad fluorescent light source[C], 15(2012).

[20] Shi C J, Chu Y B, Li J Y. Study on ultrawideband fluorescence characteristics of bismuth-doped phosphosilicate fiber[C], 223(2021).

[21] Tian J M, Guo M T, Wang F et al. High gain E-band amplification based on the low loss Bi/P co-doped silica fiber[J]. Chinese Optics Letters, 20, 100602(2022).

[22] Guo M T, Tian J M, Wang F et al. Amplification output in E+S band based on self-developed Ge-Bi co-doped Shi Ying fiber[J]. Chinese Journal of Lasers, 50, 0616002(2023).