The work in this paper regards the exploitation of a distributed feedback laser (DFB) on standard modulation schemes for radio-over-fiber applications. Specifically, the rate-equation model of the DFB laser is utilized in a number of simulations, concerning the case of intensity modulation by RF signals such as AM (Amplitude Modulation) and FM (frequency modulation), on the frequency band from 1 to 17GHz with special interest in the 2.4GHz, 5.7GHz regions due to standards for WLAN applications. Problems due to laser's intrinsic non-linearity are particularly addressed. The results show that apart from proper specifications on the laser's operating parameters also a suitable modulation scheme must be chosen.