[1] Barbier D, Bruno P, Cassagnettes C et al.. Net gain of 27 dB with a 8.6-cm-long Er-Yb-doped glass-planar-amplifier. Opt. Fiber Commun. San Jose, California. Conf., OFC ′98 Technical Digest. 45～46

[2] Shooshtari A, Touam T, Najafi S I. Yb3+Sensitized Er3+-doped waveguide amplifiers: A theoretical approach. Proc. SPIE, 2000, 3278:149～165

[3] Iannone C, Reichmann K C, Birk M et al.. A 160-km transparent metro WDM ring network featuring cascaded erbium-doped waveguide amplifiers. OSA Optical Fiber Commun. (OFC) Proc., Anaheim, CA 2001. 17～22

[4] Wong S F, Pun E Y B, Chung P S. Er3+-Yb3+ codoped phosphate glass waveguide amplifier using Ag+-Li+ ion exchange. IEEE Photon. Technol. Lett., 2002, 14(1):80～82

[9] Artemev E F, Murzin A G, Federov Y K et al.. Some characteristics of population inverion of the 4I13/2 level of erbium-ions in ytterbium-erbium glasses. Sov. J. Quant. Electron., 1981, 11(8):1266～1268

[11] Honkanen S, Ohtsuki T, Jiang S. High Er concentration phosphate glasses planar waveguide amplifiers. Proc. SPIE, 1997, 2996:32～40

[12] Lester C, Bjarklev A, Rasmussen T et al.. Modeling of Yb3+-sensitized Er3+-doped silica waveguide amplifiers. J. Lightwave Technol.,1995, 13(5):740～743