[1] Komachiya, M., et al., Secondary-phase-modulation method for open-loop fiber-optic gyroscopes
[J]. Applied Optics, 1996,35(19): 3719-3725. 

[2] Mitomi, Y., B. Yoshida, and V. Martinelli, International-Cooperation Brings Fiber Optic Gyroscopes to Market
[J]. Photonics Spectra, 1995, 29(7): 88. 

[3] Holloway, W.T., A.J. Keating, and D.D. Sampson, Multiwavelength source for spectrum-sliced WDM access networks and LAN's
[J]. IEEE Photonics Technology Letters, 1997, 9(7): 1014-1016. 

[4] Massicott, J.F., R. Wyatt, and B.J. Ainslie, Low-Noise Operation of Er3+ Doped Silica Fiber Amplifier around 1.6-Mu-M
[J]. Electronics Letters, 1992, 28(20): 1924-1925. 

[5] Mahdi, M.A., et al., Long-wavelength EDFA gain enhancement through 1550 nm band signal injection
[J]. Optics Communications, 2000. 176(3): 125-129. 

[6] Lee, J.H., et al., Enhancement of power conversion efficiency for an L-band EDFA with a secondary pumping effect in the unpumped EDF section
[J]. IEEE Photonics Technology Letters, 1999, 11(1): 42-44. 

[7] Harun, S.W., P. Poopalan, and H. Ahmad, Gain enhancement in L-band EDFA through a double-pass technique
[J]. IEEE Photonics Technology Letters, 2002, 14(3): 296-297. 

[8] Flood, F.A. and C.C. Wang, 980-nm pump-band wavelengths for long-wavelength-band erbium-doped fiber amplifiers
[J]. IEEE Photonics Technology Letters, 1999, 11(10): 1232-1234. 

[9] Li Haoquan, Nie Qiuhua, Xu Tiefeng, etal., Performances research of two-stage broadband erbium-doped tellurite fiber amplifier
[J]. Chinese Journal of Quantum Electronics (量子电子学报), 2006, 23(1): 109-114 (in Chinese). 

[10] Mao, Q.H., Lit, J. W. Y., Amplification enhancement of L-band erbium-doped fiber amplifiers by reflection scheme. Optics Communications, 2002, 201(1): 61-69.