Journal
OPTICS LETTERS
Volume 28, Issue 23, Pages 2363-2365Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.28.002363
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Beam propagation in multimode graded-index parabolic optical fibers in the presence of group-velocity dispersion and Kerr nonlinearity is theoretically investigated. It is shown that a modulational instability arising from the periodic spatial focusing of the beam takes place regardless of the sign of fiber dispersion, leading to a highly nonlinear space-time dynamics and the generation of ultrashort optical pulses. (C) 2003 Optical Society of America.
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