Abstract

Modulational instability in fiber Bragg gratings is investigated by coupled-mode theory. In the presence of anomalous dispersion the standard nonlinear Schrödinger results are obtained at low powers, although at higher powers, deviations from this well-known behavior occur. For normal dispersion an instability with a finite threshold is found. This instability has no equivalent in the nonlinear Schrödinger equation.

© 1998 Optical Society of America

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