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Abstract We theoretically propose and numerically validate an all‐optical scheme to generate optical pulse trains with varying peak‐powers and durations. A shaping of the spectral phase thanks to discrete π/2 phase shifts enables an efficient phase‐to‐intensity conversion of a temporal phase modulation based on a two‐tone sinusoidal beating. Experiments carried out at telecommunication wavelengths and at a repetition rate of 10 GHz confirm the ability of our approach to efficiently generate a train made of pulses with properties that vary from pulse‐to‐pulse. The levels of jitters can be accurately controlled.