Abstract
Modulation instability (MI) induced by two strong beams and a weak beam via cross
phase modulation is investigated. Multiple four-wave-mixing (FWM) processes associated
with the MI in low-birefringence fibers are studied both theoretically and
experimentally. The coupled-mode equations describing the MI-induced FWM nonlinear
interactions between pump waves and sideband waves are derived. Theoretical and
experimental results show that, on the assistance of MI, new optical frequencies can be
generated quite efficiently from multiple FWM processes. More than eleven sidebands are
experimentally achieved by the MI-driven multiple FWM processes. The transfer of energy
from pumps to sidebands can be dramatically enhanced by the MI-induced parametric
process. The experimental observations by using a piece of highly nonlinear
dispersion-flattened photonic-crystal fiber confirm our theoretical predictions.
© 2011 IEEE
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