  Kerr instability can be exploited to amplify visible, near-, and mid-infrared
ultrashort pulses. We use the results of Kerr instability amplification theory
to inform our simulations amplifying few-cycle pulses. We show that the
amplification angle-dependence is simplified to the phase matching condition of
four-wave mixing when the intense pump is considered. Seeding with few-cycle
pulses near the pump leads to broadband amplification without spatial chirp,
while longer pulses undergo compression through amplification. Pumping in the
mid-IR leads to multi-octave spanning amplified pulses with single-cycle
duration not previously predicted. We discuss limitations of the amplification
process and optimizing pump and seed parameters to maximize amplification.
