  In this article, we derive analytically the complex optical spectrum of a
pulsed laser source obtained when a frequency comb generated by phase
modulation is input into a synchronized intensity modulator. We then show how
this knowledge of the spectrum may help to achieve unprecedented accuracy
during the experimental spectrum correction step usually carried out with an
optical spectrum processor. In numerical examples, for a given average power we
present up to a 75 % increase in peak power and an enhancement of the
extinction ratio by at least three orders of magnitude. This method also
enables large-factor rate-multiplications of these versatile coherent sources
using the Talbot effect with negligible degradation of the signal.
