  We theoretically and experimentally demonstrate a new electro-optic linear
approach to generate high repetition-rate picosecond pulse trains. This simple
cavity-free method is based on a temporal sinusoidal phase modulation combined
with a triangular spectral phase processing. Experimental results validate the
concept at repetition rates ranging from 10 GHz up to 40 GHz with the
generation of background-free pulse trains made of nearly Gaussian
Fourier-transform limited pulses.
