  We study the photoassisted shot noise generated by a periodic voltage in the
fractional quantum Hall regime. Fluctuations of the current are due to the
presence of a quantum point contact operating in the weak backscattering
regime. We show how to reconstruct the photoassisted absorption and emission
probabilities by varying independently the dc and ac contributions to the
voltage drive. This is made possible by the peculiar power-law behavior of the
tunneling rates in the chiral Luttinger liquid theory, which allow to
approximate the typical infinite sums of the photoassisted transport formalism
in a simple and particularly convenient way.
