A method that combines amplitude modulation and dispersive transmission for producing high-repetition periodic pulse trains in multiple wavelengths is proposed. The conditions satisfied by the several involved parameters for obtaining well-conformed high-contrast pulse trains are based in a generalization of the temporal Talbot effect. The basic scheme is designed to consider dense wavelength-division multiplexing pulse sequence as the input signal. In this case, periodic pulse trains with different repetition rates and a multispectra content can be obtained. Numerical results are shown to corroborate this approach, illustrating how the involved approximations affect the irradiance distribution of the output pulses.