分别讨论了亮孤子和暗孤子在光折变晶体中诱导波导的折射率分布 ,结果表明光诱导波导的折射率分布除与光强的倒数有关外 ,还与光强对数的一阶导数有关 .后者对折射率的影响引起波导折射率的非对称性分布 The refractive index distributions of the waveguide induced by bright and dark solitons in the photorefractive crystal are discussed respectively. The results show that the refractive index distribution of the light-induced waveguide is related to the first derivative of the logarithm of light intensity, The latter effect on the refractive index leads to an asymmetric distribution of the refractive index of the waveguide