All-optical chaos has been widely used in the fields of secure communication and true random number generator because of its simple structure

noise-like feature and unpredictability.In this paper

the phase effect of specific dispersion curve and the non-linear effect of internal and external laser cavity are used to flat the frequency spectrum of chaotic signals

so as to realize high-bandwidth chaotic signals and weaken the inherent correlation of chaotic signals in a certain extent.Firstly

this article builds a traditional all-optical chaotic structure and analyzes its frequency spectrum characteristics.Then

a series of specific dispersion curve generated by the dispersion compensation device is introduced into the external cavity ring of the system structure.Moreover

the impact of different dispersion curves in the frequency spectrum of chaotic signals is studied.Through the experimental results

this scheme is proved that it can broaden the frequency spectrum of the chaotic signals.