提出了一个考虑背景光光伏效应贡献的光伏孤子理论 ,它指出在折射率变化为正的晶体中 ,既可产生光伏亮孤子 ,也可产生光伏暗孤子 .当背景光对信号光的有效Glass系数之比为R小于 1时 ,孤子是亮的 ;R大于 1时 ,孤子是暗的 .对亮孤子而言 ,R值越大 ,孤子越宽 ,而对暗孤子 ,R值越大 ,孤子越窄 .当R为 1时 ,不能形成光伏孤子 .一维暗孤子实验结果与理论一致 . A theory of photovoltaic solitons considering the contribution of background photovoltaic effect is proposed, which shows that both bright solitons and dark solitons can be generated in the crystal with positive refractive index change. When the effective glass coefficient The ratio of R is less than 1, the soliton is bright; R is greater than 1, the soliton is dark. For bright solitons, the larger the value of R, the soliton is wider, while for dark solitons, the larger the value of R, the soliton Narrow .When R is 1, can not form photovoltaic solitons. One-dimensional dark soliton experimental results and theory.