[1] B. Pedersen. Power requirements for erbium-doped fiber amplifiers pumped in the 800, 980 and 1480 nm bands. IEEE Photon. Technol. Lett., 1992, 4(1): 46～49

[2] J. L. Zyskind. Advances in erbium-doped fiber amplifiers for optical communications. Proc. SPIE, Fiber Laser Sources and Amplifiers, 1990, 1373: 80～83

[4] M. Shimizu. Highly efficient integrated optical fibre amplifier module pumped by a 980 nm laser diode. Electron. Lett., 1990, 26(20): 1641～1643

[5] Xin Jiang, Xiaoming Liu, Jiangde Peng et al.. Wide-band EDFA with 41 dB gain and 28 W power output at 1550 nm. IOOC 1995 Technical Digest Series, Hong Kong, 1995: 18～19

[6] O. Lumholt. Fundamental limit at ions in EDFA-based AM-VSB CATV systems. J. Lightwave Technol., 1993, 11(8): 1344～1352