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
C. Martijn de Sterke, "Theory of modulational instability in fiber Bragg gratings," J. Opt. Soc. Am. B 15, 2660-2667 (1998)