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Résumé : Pulse shaping in a narrowband single-photon source based on cavity-enhanced spontaneous parametric down-conversion is analyzed. The scheme for pulse shaping is developed such that the wave form (both amplitude and phase) of heralded photons can be fully controlled by that of the pump pulse. It is shown that the developed scheme allows one to avoid additional losses introduced by amplitude modulators, thereby achieving the highest possible heralding efficiency.