We investigate modulational instability in normally dispersive highly birefringent fibers. By means of a technique based on a two-frequency pump field we are able to provide evidence for strong nonlinear dependence of the modulational instability spectra. This dependence manifests itself by the appearance of a nonlinear spectral gap in which modulational instability vanishes.
© 1996 Optical Society of America
Original Manuscript: May 16, 1996
Published: October 15, 1996
P. Tchofo Dinda, M. Haelterman, G. Millot, and E. Seve, "Demonstration of a nonlinear gap in the modulational instability spectra of wave propagation in highly birefringent fibers," Opt. Lett. 21, 1640-1642 (1996)