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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry Van Driel
  • Vol. 26, Iss. 1 — Jan. 1, 2009
  • pp: 183–188

Modulational instability in lossless fibers with saturable delayed nonlinear response

G. L. da Silva, Iram Gleria, M. L. Lyra, and A. S.B. Sombra  »View Author Affiliations


JOSA B, Vol. 26, Issue 1, pp. 183-188 (2009)
http://dx.doi.org/10.1364/JOSAB.26.000183


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Abstract

We investigate the modulational instability of optical pulses propagating in a lossless fiber where both effects of relaxation and saturation of the nonlinearity are taken simultaneously into account. The saturation of the nonlinearity is incorporated in the relaxation dynamics of the Kerr response. We calculate the exact dispersion relation for harmonic perturbations over the stationary solution. In the anomalous dispersive regime, the gain spectrum exhibits two bands in the fast relaxation regime. The low energy band is reduced by the saturation of the nonlinearity but is roughly insensitive to the nonlinearity response time. The high energy band is mainly due to the Raman response. These frequency bands superpose for fast relaxation responses and a new behavior sets up. In the normal dispersive regime, a single instability band sets up associated with the finite response time of the nonlinearity with distinct features for fast and slow nonlinear relaxation.

© 2008 Optical Society of America

OCIS Codes
(190.3100) Nonlinear optics : Instabilities and chaos
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons

ToC Category:
Nonlinear Optics

History
Original Manuscript: October 2, 2008
Manuscript Accepted: November 5, 2008
Published: December 24, 2008

Citation
G. L. da Silva, Iram Gleria, M. L. Lyra, and A. S. B. Sombra, "Modulational instability in lossless fibers with saturable delayed nonlinear response," J. Opt. Soc. Am. B 26, 183-188 (2009)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-26-1-183


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