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We study the modulational instability induced by periodic variations ofgroup-velocity dispersion and nonlinear coefficients in a highly birefringentfiber. We observe, for each resonance order, the presence of two pairs ofgenuine vector type sidebands, which are spectrally unbalanced between thepolarization components for nonzero group-index mismatch, and one pair ofbalanced sidebands emerging and dominating at increasing group-index mismatch.As the conventional modulational instability manifests itself, it is partiallysuppressed by the proximity of these new unstable regions.

Vector modulational instability induced by parametric resonance in periodically tapered highly-birefringent optical fibers