[2] Oppenheim A V, Willsky A S, Hamid N S. Signals and Systems. Beijing: Publishing House of Electronics Industry, 2002.
[3] Lee E A, Varaiya P. Structure Analyzing of Signals and Systems. Beijing: Publishing House of Electronics Industry, 2006.
[4] Cheng H C, Shiu M S. Appl. Opt., 2012, 51(36): 8762.
[5] Xi P, Mei K, Brauler T, et al. Appl. Opt., 2011, 50(3): 366.
[7] Sebastien V, Daniel L, Kostadinka B, et al. Appl. Opt., 2012, 51(11): 1701.