[1] [1] Zhang Z Q. Light amplification and localization in randomly layered media with gain. Phys Rev B,1995,52(11):7960～7964

[2] [2] Jiang X Y,Soukoulis C M. Transmission and reflection studies of periodic and random systems with gain. Phys Rev B,1999,59(9): 6159～6166

[3] [3] Sheng P,Zhang Z Q,White B,et al. Minimum wave-localization length in a one-dimensional random medium. Phys Rev Lett,1986,57(8): 1000～1003

[4] [4] Dowling J P,Scalora M,Bloemer M J,et al. The photonic band edge laser: a new approach to gain enhancement. J Appl Phys,1994,75(4):1896～1899

[5] [5] Chen W Z,Fu L L,Zheng X L,et al. Acta Photonica Sinica,2003,32(2):239～243

[6] [6] Duan X F,Niu Y X,Zhang C,et al. Acta Photonica Sinica,2003,32(9):1086-1089

[7] [7] Ji J R,Zhu H Z,Ye W M,et al. Acta Photonica Sinica,2004,33(6):700～703

[8] [8] Bendickson J M,Dowling J P,Scalora M. Analytic expressions for the electromagnetic mode density in finite,one-dimensional,photonic band-gap structures.Phys Rev E,1996,53(4):4107～4121