[1] [1] N. Takeda, H. Taga, K. Imai et al.. Forty WDM 2.5-Gbit/s transmission over 12000 km using widely gain-flattened low-noise 980-nm pumped EDFAs [C]. Optical Fiber Communication Conference and Exhibit, 1998, OFC’98, Technical Digest, 22～27 Feb. 1998, 54～55

[2] [2] S. Yoshida, S. Kuwano, N. Takachio et al.. 10 Gbit/s×10 channel WDM transmission experiment over 1200 km with repeater spacing of 100 km without gain equalization or pre-emphasis [C]. Tech. Dig. OFC’96, San Jose, California, Feb. 1996, 19～21

[3] [3] Yan Liu, Yongjun Fu, Zhongwei Tan et al.. Dispersion compensation of 2×10 Gb/s 1000 km WDM system using chirped fiber Bragg gratings [C]. APOC’02, SPIE, 2002, 4904:75～79

[5] [5] C. Randy Giles, Emmanuel Desurvire. Modeling erbium-doped fiber amplifier [J]. J. Lightwave Technol., 1991, 9(2):271～282

[6] [6] E. Desurvire. Erbium-Doped Fiber Amplifier: Principles and Applications [M]. New York: Wiley, 1994

[7] [7] E. Desurvire, J. R. Simpson. Evaluation of 4I15/2 and 4I13/2 Stark-level energies in erbium-doped aluminosilicate glass fibers [J]. Opt. Lett.- 1990, 15(10):547～549