In this structure, the Gaussianmode could be transferred to the ring mode. So FEPCF could used as a mode convertor.
在这种结构中，高斯模可以转移到环形模，因此这种光纤可以作为一种模式转换器。
2
Having adopted the quadratic approximation of potential, we can solve the equation and get the approximately analytical solutions of Gaussian typed breath mode.
对势函数采用二阶近似后，求解此方程得到高斯型呼吸模式的光束宽度的近似解析式。
3
The equation is formally consistent with that of a particle moving in potential well, so we can use the behavior of a particle moving in potential well to describe the breath mode of Gaussian beams.