On the basis of the basic equations describing the propagation variation of optical pulses in optical fibers

this paper first investigates in depth the characteristics of super-Gaussian pulses propagating in conventional single-mode fibers.Then it theoretically analyzes the different factors affecting the position of the narrowest pulse width in the fibers and obtains by simulation the approximate distribution functions of the position of the narrowest pulse width

the initial pulse width

and secondorder group velocity dispersion coefficient.The results indicate that the pulse shape of the incident super-Gaussian pulses without initial chirps into the fiber will no longer remain a single-peak structure

but undergoes a variation from near-rectangular

multi-peak

and finally to single-peak and that the pulse width influenced by chromatic dispersion will go through a process of first narrowing and then broadening.The research on the position of the narrowest pulse width in a fiber is instructive to determining the dispersion compensation position in practical optical communication and optical sensing.