On the base of a plenty of facts we suggested a method in which bi-Gaussian form is approached the output pulse in multimode fibers The accuracy measuring band in time domain can be improved highly.

• 在综合大量实例的基础上,提出双高斯函数逼近多模光纤的光脉冲输出的解析近似方法,使时域法确定光纤带宽的精度大为提高。