[1] [1] C. M. de Sterke, N. G. Broderick, B. J. Eggleton et al.. Nonlinear optics in fiber gratings [J]. Optical Fiber Technology, 1996, 2:253～268

[3] [3] R. A. Betts, T. Tjugiarto, Y. L. Xue et al.. Nonlinear refractive index in erbium doped optical fiber: theory and experiment [J]. IEEE J. Quantum Electron., 1991, 27(4):908～913

[4] [4] J. W. Arkwright, P. Elango, G. R. Atkins et al.. Experimental and theoretical analysis of the resonant nonlinearity in ytterbium-doped fiber [J]. J. Lightwave Technol., 1998, 16(5):798～806

[5] [5] P. L. Chu. Nonlinear effects in rare-earth-doped fibers and waveguides [C]. Lasers and Electro-Optics Society Annual Meeting, 1997, LEOS ’97 10th Annual Meeting. Conference Proceedings, IEEE, 1996, 1:371～372

[7] [7] G. P. Agrawal. Nonlinear Fiber Optics [M]. 3rd edition, New York: Academic Press, 2001. 20