Abstract
Modulational instability is a process in which an intense cw beam in a nonlinear dispersive medium acquires a pair of sidebands symmetrically disposed about the pump wavelength. Beating between the pump and sidebands results in a periodic train of pulses whose repetition rate is given by the frequency separation between the pump and the sidebands. Numerous experimental observations have confirmed the existence of this phenomenon. In this paper we show that the same process that gives rise to a periodic pulse train can result in a chaotic output if the pump intensity exceeds a critical value. Chaos developes as a consequence of multiple four-wave mixing that creates a plethora of sidebands.
© 1991 Optical Society of America
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