[2] Yang Jianhu, Dai Shixun, Dai nengli et al.. Effect of Bi2O3 on the spectroscopic properties of erbiumdoped bismuth silicate glasses. J. Opt. Soc. Am. (B), 2003, 20(5): 810～815

[5] Philipps J F, T pfer T, Ebendorff-Heidepriem H et al.. Spectroscopic and lasing properties of Er3+Yb3+-doped fluoride phosphate glasses. Appl. Phys., 2001, B72: 399～405

[6] Yang Jianhu, Dai Shixun, Zhou Yuefen et al.. Spectroscopic properties and thermal stability of erbium-doped bismuth-based glass for optical amplifier. J. Appl. Phys., 2003, 93(2): 977～983

[7] Zou Xuelu, Itoh Katsuhisa, Toratani Hisayoshi. Transmission loss characteristics of fluorophosphates optical fiber in the ultraviolet to visible wavelength region. J. Crys. Solids, 1997, 215: 11～20

[8] Obaton A F, Labbé C, Le Boulanger P et al.. Excited state absorption in Yb3+-Er3+-codoped phosphate glasses (ZnO-Al2O3-La2O3-P2O5) around the 4I13/2-4I15/2 emission spectral range. Spectrochimica Acta Part A, 1999, 55: 263～271