[3] C. Randy Giles, Emmanuel Desurvire. Modeling Erbium-doped fiber amplifiers[J]. J. Lightwave Technology, 1991, 9(2): 271~283
[6] F. Di Pasquale, M. Federighi. Improved gain characteristics in high-concentration Er3+/Yb3+ codoped glass waveguide amplifiers[J]. IEEE J. Quant. Electron., 1994, 30(9): 2127~2131