  We show that the velocity and thus the frequency of a signal pulse can be
adjusted by the use of a control Airy pulse. In particular, we utilize a
nonlinear Airy pulse which, via cross-phase modulation, creates an effective
potential for the optical signal. Interestingly, during the interaction, the
signal dispersion is suppressed. Importantly, the whole process is controllable
and by using Airy pulses with different truncations leads to predetermined
values of the frequency shifting. Such a functionality might be useful in
wavelength division multiplexing networks.
