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Theoretical analysis reveals modulational polarization instability in single-mode optical fibers, indicating intense beams can destabilize even in normal-dispersion regimes.
The interplay between linear birefringence, nonlinear polarization changes, and chromatic dispersion may lead to phase-matched parametric four-photon mixing. As a result, new modulational polarization instabilities are predicted in single-mode fibers: Instability of an intense light beam may occur even when the wave is coupled to a spatially stable eigenmode, and propagates in the normal-dispersion regime.
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S. Wabnitz (1988) studied this question.
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