Because of the large bandwidth that the optical fiber offers as transmission medium of information and the flexibility of communication of the wireless systems, a new mixed infrastructure called radio over fiber system (Radio over Fiber, RoF) have been developed, these have been characterized for implementing division multiplexing wavelength (WDM) and these work with radio carrier signals in the band of extremely high frequencies (extremely high frequency, EHF.) Nevertheless, this type of communication systems presents linear errors as the dispersion. This article describes the research done and the results obtained from the simulation of a RoF system using multiplexing WDM through the Matlab software, the which it has as main objective to model and simulate an RoF system for to assess the degradations produced by the dispersion that affect the signal in the transmission of information.