But for third-and fourth-order femtosecond solitons, different from the corresponding ones in picosecond dimension, the higher-order effects destroy the periodicity of the propagation.

• 而三阶和四阶飞秒孤子的演化特性与相应的皮秒孤子的演化特性有很大不同，高阶效应的存在不同程度上破坏了三阶和四阶孤子演化的周期性。