[2] Bai B. Research on key technology of fiber lasers in optical fiber transmission systems[D], 10-15(2013).
[3] Wang C. Research on single mode fiber laser and applications of coherent optical communication[D], 10-14(2018).
[5] Dai Z Y, Zhang X X, Peng Z S et al. A novel single-frequency narrow linewidth fiber laser based on self-feedback light injection[J]. Journal of Optoelectronics·Laser, 21, 813-816(2010).
[7] Zhao R R, He W, Zhu L Q. A novel narrow line-width erbium-doped fiber laser[J]. Laser & Infrared, 45, 492-495(2015).
[8] Bai Y, Yan F P, Feng T et al. Ultra-narrow-linewidth fiber laser in 2 μm band using saturable absorber based on PM-TDF[J]. Chinese Journal of Lasers, 46, 0101003(2019).
[9] Hu J, Wang Y F, Xing Z K et al. Narrow-linewidth random fiber laser based on random fiber grating[J]. Acta Optica Sinica, 40, 1614002(2020).
[10] Gao J, Jiao D D, Liu J et al. Laser linewidth measurement based on recirculating self-heterodyne method with short fiber[J]. Acta Optica Sinica, 41, 0712002(2021).
[11] Cui M B, Huang J G, Yang X L. Review on methods for laser linewidth measurement[J]. Laser & Optoelectronics Progress, 58, 0900005(2021).
[12] Li S R, Lin P, Hu Z L et al. Effect of fiber delay line on measurement of laser linewidth and data correction[J]. Journal of Tianjin University of Technology, 28, 27-29, 45(2012).
[13] Huang S H. Study on the precise measurement of laser linewidth and linewidth compression of 1.5-μm fiber laser[D], 80-84(2017).