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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1993),
  • paper QWH5

Modulational-instability effects in the region close to zero-group-velocity dispersion

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Abstract

Interest in nonlinear phenomena in the spectral region close to the zero value of fiber group-velocity dispersion (GVD) 2k/∂ω2 = 0 is provoked by the needs of highbit-rate data transmission lines. Traditionally, the nonlinear effects have been treated separately for the positive and negative GVD regions of fibers. To link the features of the nonlinear processes in various GVD spectral regions it is necessary to consider higher-order dispersion terms in the nonlinear propagation equation. We study the effect of modulational instability1–4 (MI) and analyze the transformation of its characteristics under tuning of the pump wavelength through the region of zero GVD. The three important geometries of pump, Stokes, and anti-Stokes wave interaction are investigated for (a) all three waves polarized along the polarization axis of the fiber, (b) Stokes and anti-Stokes waves polarized orthogonal to the pump wave, and (c) the pump wave equally split between the two principal polarization axes of a high-birefringence fiber. The fiber is assumed to have a step-index profile, and the fourth-order dispersion ∂4k/∂ω4 term is included in the propagation equation.

© 1993 Optical Society of America

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