[1] Zhao Chujun, Peng Runwu, Tang Zhixiang et al.. Design and analysis of a kind of large flattened mode optical fiber［J］. Chin. Phys., 2006, 15(8): 1838～1842

[2] John M. Fini. Design of large-mode-area amplifier fibers resistant to bend-induced distortion［J］. J. Opt. Soc. Am. B, 2007, 24(8): 1669～1676

[3] Zhou Qinling, Lu Xingqiang, Zhang Guang et al.. Mode characteristics of a large mode area flattened-mode photonic crystal fiber［J］. Acta Optica Sinica, 2010, 30(5): 1497～1500

[4] Shuang Chen, Ying Feng, Ling Wang. Design of large-mode-area rare earth doped fiber for high power coiled fiber amplifier［J］. Chin. Opt. Lett., 2009, 7(8): 671～674

[5] Xue Yuhao, He Bing, Wang Wei et al.. Hundred-micron core diameter fiber laser and its mode control［J］. Chinese J. Lasers, 2009, 36(7): 1900～1904

[6] V. Filippov, Y. Chamorovskii, J. Kerttula et al.. 600 W power scalable single transverse mode tapered double-clad fiber laser［J］. Opt. Express, 2009, 17(3): 103～1214

[7] Jens L., Zellmer H., Tunnermann A. et al.. Suppression of higher order modes in a multimode fiber amplifier using efficient gain-loss-management (GLM)［C］. Advanced Solid-State Lasers: Optical Society of America, Québec City Canada, 2002: MB20

[8] J. R. Marciante, R. G. Roides. Mode control in large-mode-area fiber lasers via gain filtering［C］. OSA/CLEO/IQEC 2009, 2009. CWD2

[9] Liao Suying, Gong Mali, Zhang Haitao. Selection of doping radius for part-doped fibers［J］. Chinese J. Lasers, 2009, 39(11): 2836～2841

[10] Ramachandran S., Nicholson J. W., Ghalmi S. et al.. Light propagation with ultralarge modal areas in optical fibers［J］. Opt. Lett., 2006, 31(12): 1797～1799

[11] J. W. Nicholson, C. Headley, J. Phillips et al.. Higher-order-mode fiber amplifiers［C］. OSA/ASSP/LACSEA, 2010z: LSWD1

[12] Petermann K.. Constraints for fundamental-mode spot size for broadband dispersion-compensated single-mode fibres［J］. Electronics Letters, 1983, 19: 712～714

[13] Boullet J., Zaouter Y., Desmarchelier R. et al.. High power ytterbium-doped rod-type three-level photonic crystal fiber laser［J］. Opt. Express, 2008, 16(22): 17891～17902

[14] Fabio Di Teodoro, Christopher D. Brooks. Multi-MW peak power single-transverse mode operation of a 100 micron core diameter, Yb-doped photonic crystal rod amplifier［C］. SPIE, 2007, 6453: 645308～645315

[15] Liang Dong, Jun Li, Xiang Peng. Bend-resistant fun-damental mode operation in ytterbium-doped leakage channel fibers with effective areas up to 3160 μm2［J］. Opt. Express, 2006, 14(24): 11512～11519

[16] Fini J. M.. Bend-resistant design of conventional and microstructure fibers with very large mode area［J］. Opt. Express, 2006, 14: 69～81

[17] Fini J. M.. Intuitive modeling of bend distortion in large-mode-area fibers［J］. Opt. Lett., 2007, 32(12): 1632～1634

[18] Liao S., Gong M., Zhang H.. Influence of mode distor-tion on the transverse mode competition in large-mode-area amplifiers［J］. Opt. Commun., 2009, 282(3): 406～412