[1] Ma X X, Lu B L, Wang K L et al. Tunable broadband single-frequency narrow-linewidth fiber laser[J]. Acta Optica Sinica, 39, 0114001(2019).

[2] Feng T, Ding D L, Yan F P et al. Widely tunable single-/dual-wavelength fiber lasers with ultra-narrow linewidth and high OSNR using high quality passive subring cavity and novel tuning method[J]. Optics Express, 24, 19760-19768(2016).

[3] Meng Z, Stewart G, Whitenett G. Stable single-mode operation of a narrow-linewidth, linearly polarized, erbium-fiber ring laser using a saturable absorber[J]. Journal of Lightwave Technology, 24, 2179-2183(2006).

[4] Honzatko P, Baravets Y, Myakalwar A K. Single-frequency fiber laser based on a fiber ring resonator filter tunable in a broad range from 1023 nm to 1107 nm[J]. Optics Letters, 43, 1339-1342(2018).

[5] Xu P. Study on mode instabilities and synergetic properties of self-organized feedback fiber ring lasers[D]. Changsha: National University of Defense Technology, 75-181(2013).

[6] Ma M X, Yang H Y, Xu P et al. Investigation on characteristics of mode hopping in ultra-narrow linewidth erbium-doped fiber ring laser under pump modulation[J]. Acta Optica Sinica, 32, 0314002(2012).

[7] Chen X F, Yao J P, Zeng F et al. Single-longitudinal-mode fiber ring laser employing an equivalent phase-shifted fiber Bragg grating[J]. IEEE Photonics Technology Letters, 17, 1390-1392(2005).

[8] Cheng Y, Kringlebotn J T, Loh W H et al. Stable single-frequency traveling-wave fiber loop laser with integral saturable-absorber-based tracking narrow-band filter[J]. Optics Letters, 20, 875-877(1995).

[9] Kang M S, Lee M S, Yong J C et al. Characterization of wavelength-tunable single-frequency fiber laser employing acoustooptic tunable filter[J]. Journal of Lightwave Technology, 24, 1812-1823(2006).

[10] Zhang J L, Yue C Y, Schinn G W et al. Stable single-mode compound-ring erbium-doped fiber laser[J]. Journal of Lightwave Technology, 14, 104-109(1996).

[11] Yang X X, Zhan L, Shen Q S et al. High-power single-longitudinal-mode fiber laser with a ring Fabry-Pérot resonator and a saturable absorber[J]. IEEE Photonics Technology Letters, 20, 879-881(2008).

[12] Zhang K, Kang J U. C-band wavelength-swept single-longitudinal-mode erbium-doped fiber ring laser[J]. Optics Express, 16, 14173-14179(2008).

[13] Xu P, Hu Z L, Jiang N et al. Transient reflectance spectra of adaptive filters based on dynamic population gratings[J]. Optics Letters, 37, 1992-1994(2012).

[14] Ma M X, Hu Z L, Xu P et al. Detecting mode hopping in single-longitudinal-mode fiber ring lasers based on an unbalanced fiber Michelson interferometer[J]. Applied Optics, 51, 7420-7425(2012).

[15] Liang X, Yao Q, Hu Y M et al. Real-time mode hopping detection on narrow line-width laser source based on unbalanced fiber interferometer[J]. Acta Optica Sinica, 29, 437-442(2009).

[16] Liang X. Investigation of noise analysis and suppression technologies in fiber optic hydrophone system[D]. Changsha: National University of Defense Technology, 58-67(2008).

[17] Ma M X, Hu Z L, Xu P et al. Observation of mode instability and coherence collapse in a single-frequency polarization-maintaining fiber ring laser[J]. Optical Engineering, 53, 066107(2014).

[18] Ji J R[M]. Advanced optics tutorial: basic electromagnetism theory in optics, 243-246(2007).

[19] Ni M, Hu Y M, Meng Z et al. Dynamic range of fiber optic hydrophone using digitized phase generated carrier[J]. Laser & Optoelectronics Progress, 42, 33-37(2005).

[20] Ferreira L A, Santos J L, Farahi F. Polarization-induced noise in a fiber-optic Michelson interferometer with Faraday rotator mirror elements[J]. Applied Optics, 34, 6399-6402(1995).