title: Demonstration of a nonlinear gap in the modulational instability spectra of wave propagation in highly birefringent fibers.
abstract: 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.
authors.forename: P T
authors.initials: PT
authors.lastname: Dinda
authors.forename: G
authors.initials: G
authors.lastname: Millot
authors.forename: E
authors.initials: E
authors.lastname: Seve
authors.forename: M
authors.initials: M
authors.lastname: Haelterman