[1] Hasegawa A. Self-confimement of multimode optical pulse in a glass fiber. Opt Lett,1980,5(10):416～417

[2] Zhao W,Bourkoff E. Interaction between dark solitons. Opt Lett,1989,14(24):1371～1373

[3] Allan G R,Skinner S R,Andersen D R,et al. Observation of fundamental dark spatial solitons in semiconductors using picosecond pulses. Opt Lett,1991,16(3): 156～158

[4] Segev M,Crosignanim B,Yariv A. Spatial solitons in photorefractive media. Phys Rev Lett,1992,68(7) :923～926

[5] Ji X M,Nie H X,Wang J L,et al. Acta Photonica Sinica,2003,32(9):1142～1144

[6] Liu J F,Li Y L. Acta Photonica Sinica,1998,27 (11): 983～986

[7] Li B,Hou C F,Chen X Y,et al. Acta Photonica Sinica,2001,30(9):1164～1167

[8] Krolikowski W,Holmstrom S A. Fusion and birth of spatial solitons upon collision. Opt Lett,1997,22(6):369～371

[9] Hou C F,Li S Q,Li B,et al. Progress in Physics,2001,21(2):237～254

[10] Garca-Quirino G S,Iturbe-Castillo M D,Vysloukh V A,et al. Observation of interaction forces between onedimensional spatial solitons in photorefractive crystals.Opt Lett,1997,22(3) :154～156

[11] Meng H X,Salamo G,Shih M F,et al. Coherent collisions of photorefractive solitons. Opt Lett,1997,22:448～450

[12] Mamaev A V,Saffman M,Zozulya A A. Phase-depedent collisions of (2+1)-dimensional spatial solitons. J Opt Soc Am B,1998,15(7):2079～2082

[13] Krolikowski W,Luther-Davies B,Denz C,et al.Annihilation of photorefractive solitons.Opt Lett,1998,23(2):97～99

[14] Shih M F,Chen Z G,Segev M,et al. Incoherent collisions between one-dimensional bright steady-state photorefractive spatial screening solitons. Appl Phys Lett,1996,69(27):4151～4153

[15] Shih M F,Segev M. Incoherent collisions between twodimensional bright steady-state photorefractive spatial screening solitons. Opt Lett,1996,21(19) :1538～1540

[16] Stepken A,Kaiser F,Belic M R,et al. Interaction of incoherent two-dimensional photorefravtive solitons.