[1] WANG Yi-shan, ZHENG Yao-lei, SHEN Hua, et al. High-efficiency generation of cladding pumped erbium-ytterbium co-doped double clad fiber laser［J］. Acta Photonica Sinica, 2003, 32(9): 1025-1027.
[2] LI Jian-feng, DUAN Kai-liang, WANG Yi-shan, et al. Theoretical analysis of the heat dissipation mechanism in Yb3+-doped double-clad fiber lasers［J］. J mod Optics, 2008, 55(3): 459-471.
[3] DUAN Kai-liang, ZHAO Bao-yin, ZHAO Wei, et al. 1 000 W all fiber laser［J］. Chinese Journal of Lasers, 2009, 36(12): 3219.
[4] LIU An-ping, UEDA K. The absorption characteristics of circular, offset, and rectangular double-clad fibers［J］. Opt Commun., 1996, 132(5-6): 511-518.
[5] HAUTAKORPI M, KAIVOLA M. Modal analysis of the self-imaging phenomenon in optical fibers with an annular core［J］. Appl Opt, 2006, 45(25): 6388-6392.
[6] MONERIE M. Propagation in doubly clad single-mode fibers［J］. IEEE Trans on Microw Theory Tech, 1982, MIT-30(4): 381-388.
[7] MCINTYRE P D, SNYDER A W. Power transfer between optical fibers［J］. JOSA, 1973, 63(12): 1518-1527.
[8] HUANG Wei-ping, MU Jian-wei. Complex coupled-mode theory for optical waveguides［J］. Opt Express, 2009, 17(21): 19134-19152.
[9] SARKAR B C, CHOUDHURY P K, YOSHINO T. On the analysis of a weakly guiding doubly clad dielectric optical fiber with an annular core［J］. Microwave Opt Technol Lett, 2001, 31(6): 435-439.
[10] MARCOU J, FE′VRIER S. Comments on “on the analysis of a weakly guiding doubly clad dielectric optical fiber with an annular core”［J］. Microwave and Optical Tech Lett, 2003, 38(3): 249-254.
[11] HAUTAKORPI M, KAIVOLA M. Modal analysis of M-type- dielectric-profile optical fibers in the weakly guiding approximation［J］. JOSA A, 2005, 22(6): 1163-1169.
[12] BOCHOVE E J, CHEO P K, KING G G. Self-organization in a multicore fiber laser array［J］. Opt Lett, 2003, 28(14): 1200-1202.
[13] AGRAWAL G P. Nonlinear fiber optics［M］. 3rd ed. New York: Academic Press, 2001: 36-37.
