By comparing the cross-gain effect of Semiconductor Optical Amplifier (SOA), the cross-MQW-EAM absorption wavelength conversion principle is studied based on the simple structure and high efficiency of EAM wavelength conversion, and experimental devices of wavelength conversion is designed. Furthermore, the existing cross-absorption effect model is modified so that it can be used for the situation of multi-beam signals injection. Finally, the EAM mathematical model is analyzed in two conditions. The carrier concentration relation graph in single-Gaussian pulse injection and strong signal injection could be obtained by model simulation. The simulation results are consistent with the fact.