An all-optical ultra-wideband pulse shape modulation (PSM) technology based on semiconductor optical amplifier (SOA) and electro-absorption modulator (EAM) is demonstrated. In this novel scheme,the monocycle signal is generated based on the cross-gain modulation (XGM) and the gain saturation effect in a semiconductor optical amplifier.In order to imp lement pulse shape modulation,an electro-absorption modulator is employed to control the superimp osition of the pump signal and the monocycle signal.Compared with other schemes,the configuration of this new scheme is simple.Due to only one wavelength is included in the output ultra-wideband PSM signal,the dispersion management is not complicated.By using the software of OptiSystem7.0,the impacts of the input optical power,the modulation rate and the wavelength of the optical source on the generated ultra-wideband PSM signal are numerically simul ated and studied. Besides,the transmission characteristics of the output ultra-wideband PSM signa l in single mode fiber are also discussed.The results show that the generated PSM signal has a good tolera tion to the wavelength change.In addition,the optimized scope of input optical power ranges from －7d Bm to 0dBm,and the optimized scope of modulation rate ranges from 16GHz to 32GHz.