[1] Koplow J P, Kliner D A V, Goldberg L. Single-mode operation of a coiled multimode fiber amplifier [J]. Opt. Lett., 2000, 25(7): 442.
[2] Kelson J, Hardy A A. Strong pumped fiber amplifiers [J]. IEEE J. Quant. Electron., 1998, 34: 1570.
[3] Hardy A A, Oron R. Signal amplification in strongly pumped fiber amplifiers [J]. IEEE J. Quant. Electron., 1997, 33(3): 307.
[5] Limpert L, Zellmer H, Tünnermann A. Suppression of high order modes in a multimode fiber amplifier using efficient gain-loss-management (GLM) [C]. in Advanced Solid-State Lasers, Québec City, Canada, 2002, MB20: 112.
[6] Hardy A A, Oron R. Amplified spontaneous emission and Rayleigh backscattering in strong pumped fiber amplifiers [J]. J. Lightw. Technol., 1998, 16(10): 1865-1873.
[7] Gong Mali, Yuan Yanyang, Li Chen, et al. Numerical modeling of transverse mode competition in strongly pumped multimode fiber lasers and amplifiers [J]. Opt. Expr., 2007, 15(6): 3236.
[8] Galvanauskas A. Mode-scalable fiber-based chirped pulse amplification systems [J]. IEEE J. Quant. Electron., 2001, 7(4): 504.
[9] Paschotta R, Nilsson J, Tropper A C, et al. Ytterbium-doped fiber amplifier [J]. IEEE J. Quant. Electron., 1997, 33(7): 1049.