Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2008.795.801BaratiElhamBatebiS.Rahimpour SoleimaniH.5200885In this research, we study a nonsimultaneous three-soliton collision in the presence of third-order dispersion in WDM systems. The interaction between solitons may be viewed as an inelastic collision in which energy is lost to continuous radiation owing to nonzero third-order dispersion. We develop a perturbation theory with two small parameters; the third order dispersion coefficient d_{3} andthe reciprocal of the interchannel frequency difference, 1/β. In the leading order the amplitude of the emitted radiation after each collision is proportional to d_{3}/β^{2}. In addition, the only other effects up to the combined third order of the perturbation theory are phase changes and position shifts of the solitons. It has been shown that after each collision the rate of emitted energy is the same.]]>Agrawal, G.P.,2001Agrawal, G.P.,2002Elgin, J.N., T. Brabec and S.M.J. Kelly,1995Etrich, C., N.C. Panoiu, D. Mihalache and F. Lederer,2001Evangelides, S.G. and J.P. Gordon,1996Hasegawa, A. and M. Matsumoto,2002Horikis, T.P. and J.N. Elgin,2001Kaup, D.J.,1990Kodama, Y.,1985Plege, A., M. Chertkov and I. Gabitov,2003