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.
© 2003 Optical Society of America
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(060.5530) Fiber optics and optical communications : Pulse propagation and temporal solitons
(190.4420) Nonlinear optics : Nonlinear optics, transverse effects in
Stefano Longhi, "Modulational instability and space time dynamics in nonlinear parabolic-index optical fibers," Opt. Lett. 28, 2363-2365 (2003)