[3] A. M. Liu, C. Q. Wu, M. S. Lim et al.. Optical buffer configuration based on a 3×3 collinear fibre coupler[J]. Electron. Lett., 2004, 40(16): 1017~1019
[7] A. M. Liu, C. Q. Wu, Y. D. Gong et al.. Dual-loop optical buffer (DLOB) based on a 3×3 collinear fiber coupler[J]. Photon. Technol. Lett., IEEE., 2004, 16(9): 2129~2131
[8] N. K. Dutta, Qiang Wang. Semiconductor Optical Amplifiers[M]. New Jersey: World Scientific Publishing, 2006. 130~133