[1] [1] R Paschotta, J Nilsson, A C Tropper, et al.. Ytterbium-doped fiber amplifiers[J]. J Quantum Electron, 1997, 33(7): 1049-1056.

[2] [2] M E Fermann, I Hartl. Ultrafast fiber laser technology[J]. J Sel Top Quantum, 2009, 15(1): 191-206.

[3] [3] D J Richardson, J Nilsson, W A Clarkson. High power fiber lasers: Current status and future perspectives (Invited)[J]. J Opt Soc Am B, 2010, 27(11): B63-B92.

[4] [4] Y Aoki, S Kishida, H Honmou, et al.. Efficient backward and forward pumping CW Raman amplification for InGaAsP laser light in silica fibres[J]. Electron Lett, 1983, 19(16): 620-622.

[5] [5] M D Mermelstein, K Brar, C Headley. RIN transfer measurement and modeling in dual-order Raman fiber amplifiers[J]. J Lightwave Technol, 2003, 21(6): 1518-1523.

[6] [6] I Dajani, C Vergien, C Robin, et al.. Investigations of single-frequency Raman fiber amplifiers operating at 1178 nm[J]. Opt Express, 2013, 21(10): 12038-12052.

[7] [7] R I Laming, J E Townsend, D N Payne, et al.. High-power erbium-doped-fiber amplifiers operating in the saturated regime[J]. Photonic Technol Lett, 1991, 3(3): 253-255.

[8] [8] E Desurvire. Analysis of gain difference between forward-and backward-pumped erbium-doped fiber amplifiers in the saturation regime[J]. Photonic Technol Lett, 1992, 24(7): 711-714.

[9] [9] Y Ohishi, T Kanamori, Y Terunuma, et al.. Investigation of efficient pump scheme for Pr3 +-doped fluoride fiber amplifiers[J]. Photonic Technol Lett, 1994, 24(2): 195-198.

[10] [10] Y Ohishi, M Yamada, T Kanamori, et al.. Analysis of gain characteristics of bi-directionally pumped praseodymium-doped fiber amplifiers[J]. Photonic Technol Lett, 1996, 8(4): 512-514.

[11] [11] S Aozasa, T Sakamoto, T Kanamori, et al.. Tm-doped fiber amplifiers for 1470 nm band WDM signals[J]. Photonic Technol Lett, 2000, 24(10): 1331-1333.

[12] [12] S Aozasa, H Masuda, M Shimizu. S-band thulium-doped fiber amplifier employing high thulium concentration doping technique[J]. J Lightwave Technol, 2006, 24(10): 3842-3848.

[13] [13] W Yong. Optimization of pulse amplification in ytterbium-doped double-clad fiber amplifiers[J]. J Lightwave Technol, 2005, 23(6): 2139-2147.

[14] [14] W Yong, P Hong. Dynamic characteristics of double-clad fiber amplifiers for high-power pulse amplification[J]. J Lightwave Technol, 2003, 21(10): 2262-2270.

[15] [15] M Hildebrandt, S Busche, P Wessels, et al.. Brillouin scattering spectra in high-power single-frequency ytterbium doped fiber amplifiers[J]. Opt Express, 2008, 16(20): 15970-15979.

[16] [16] Q Lin, A P Govind. Vector theory of stimulated Raman scattering and its application to fiber-based Raman amplifiers[J]. J Opt Soc Am B, 2003, 20(8): 1616-1631.

[17] [17] Hu Shuling, Zhang Chunxi, Gao Chunqing, et al.. Stimulated Raman scattering and stimulated Brillouin scattering effects in ytterbium doped double clad fiber laser[J]. Chinese J Lasers, 2008, 35(1): 6-10.

[18] [18] Chen Jixin, Sui Zhan, Chen Fushen, et al.. Stimulated Raman scattering in high power double clad fiber laser[J]. Chinese J Lasers, 2006, 33(3): 298-302.

[19] [19] H J Otto, F Stutzki, F Jansen, et al.. Temporal dynamics of mode instabilities in high-power fiber lasers and amplifiers[J]. Opt Express, 2012, 20(14): 15710-15722.

[20] [20] T Eidam, C Wirth, C Jauregui, et al.. Experimental observations of the threshold-like onset of mode instabilities in high power fiber amplifiers[J]. Opt Express, 2011, 19(14): 13218-13224.

[21] [21] A V Smith, J J Smith. Overview of a steady-periodic model of modal instability in fiber amplifiers[J]. J Sel Top Quantum, 2014, 20(5): 1-12.

[22] [22] C Jauregui, T Eidam, H J Otto, et al.. Physical origin of mode instabilities in high-power fiber laser systems[J]. Opt Express, 2012, 20(12): 12912-12925.

[23] [23] L Dong. Stimulated thermal Rayleigh scattering in optical fibers[J]. Opt Express, 2013, 21(3): 2642-2656.

[24] [24] M Ilchi-Ghazaani, P Parvin. Distributed scheme versus MOFPA array on the power scaling of a monolithic fiber laser[J]. J Quantum Electron, 2014, 50(8): 698-708.

[25] [25] Y Wang, C Q Xu, H Po. Thermal effects in kilowatt fiber lasers[J]. Photonic Technol Lett, 2004, 16(1): 63-65.

[26] [26] I Kelson, A A Hardy. Strongly pumped fiber lasers[J]. J Quantum Elect, 1998, 34(9): 1570-1577

[27] [27] D Mao, X Liu, L Wang, et al.. Dual-wavelength step-like pulses in an ultra-large negative-dispersion fiber laser[J]. Opt Express, 2011, 19(5): 3996-4001.

[28] [28] X Li, X Liu, X Hu, et al.. Long-cavity passively mode-locked fiber ring laser with high-energy rectangular-shape pulses in anomalous dispersion regime[J]. Opt Lett, 2010, 35(19): 3249-3251.

[29] [29] Huang Jing, Lü Xinjie, Li Feng, et al.. Simulation characteristics of Yb3 +-doped double-clad fiber amplifier for 1053 nm pulse amplification[J]. Chinese J Lasers, 2005, 32(8): 1022-1026.

[30] [30] Chang Liping, Fan Wei, Chen Jialin, et al.. High power pulse amplification of ytterbium-doped double-clad fiber amplifier[J]. Chin Opt Lett, 2007, 5(11): 624-627.

[31] [31] A Hardy, R Oron. Signal amplification in strongly pumped fiber amplifiers[J]. J Quantum Electron, 1997, 33(3): 307-313.

[32] [32] C Ouyang, L Chai, H Zhao, et al.. Position effect of spectral filter on properties of highly chirped pulses in an all-normal-dispersion fiber laser[J]. J Quantum Electron, 2009, 45(10): 1284-1288.