[1] Mears R J, Reekie L, Jauncey I M, et al. OFC/IOOC’87., 1987, 3: W12. [2] Mears R J, Reekie L, Jauncey I M, et al. Elect. Lett., 1987, 23: 1026--1028. [3] Ainslie B J, Craig-ryan S P, Davey S T, et al. IEE Proc. J., 1990. Special Issue on optical amplifiers for communication. [4] Atkins C G, Massicott J F, Armitage J P, et al. Elec. Lett., 1989, 25: 910--911. [5] Choi Y G, Park B J, Kim K H, et al. ETRI Journal., 2001, 23: 97--105. [6] Zerras M N, Miller A E, Sasaki S. OSA/TOPS., 1997, 16: 1--9. [7] Tanabe S, Sugimoto N, Ito S, et al. J. Lumin., 2000, 87\&89: 670--672. [8] Sugimoto N, Kuroiwa Y, Ochiai K, et al. OAA2000., PDP3. [9] Day D E. J. Non-Cryst. Solids., 1976, 21: 343--372. [10] Isard J O. J. Non-Cryst. Solids., 1969, 1: 235--241. [11] Komatsu T, Ike R, Sato R, et al. Phys. Chem. Glasses., 1995, 36 (5): 216--221. [12] Neindre L L, Jiang S, Hwang B-C, et al. J. Non-Cryst. Solids., 1999, 255: 97--102. [13] Hwang W C, Jain H, Meitzner G. J. Non-Cryst. Solids., 1999, 255: 103--111. [14] Takebe H, Nageno Y, Morinaga K. J. Am. Ceram. Soc., 1994, 77: 2132--2136. [15] Weber M J, Myers J D, Blackbum D H. J. Appl. Phys., 1981, 52 (4): 2944--2949. [16] McCumber D E. Phys. Rev. A., 1964, 134 (2A): A299--A306. [17] Miniscalo W J, Quimby R S. Opt. Lett., 1991, 16 (4): 258--260. [18] Feng X, Tanabe S, Hanada T. J. Am. Ceram. Soc., 2001, 84: 165--171. [19] Shen S, Naftaly M, Jha A. SPIE., 1999, 3849: 103--111. [20] Tanabe S. J. Non-Cryst. Solids., 1999, 259: 1--9. [21] Weber M J. Phys. Rev., 1967, 157 (2): 262--272. [22] Tanabe S, Ohyagi T, Soga N, et al. Phys. Rev. B: Condens. Matter., 1992, 46 (6): 3305--3310. [23] Tanabe S, Ohyagi T, Todoroki T, et al. J. Appl. Phys., 1993, 73 (12): 8451--8454. [24] Takeble H, Nageno Y, Morinag K. J. Am. Ceram. Soc., 1995, 78: 1161--1168. [25] Rolli R, Chiasera A, Montagna M, et al. SPIE., 2001, 4282: 109--122. [26] Auzzel F, Pelle F. Phys. Rev. B., 1997, 55 (17): 11006--11009. [27] Petit L, Cardinal T, Videau J J, et al. J. Non-Cryst. Solids., 2002, 298: 76--88. [28] Judd B R. Phys. Rev., 1962, 127 (3): 750--761. [29] Ofelt G S. J. Chem. Phys., 1962, 37 (3): 511--520. |