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Bloch Wave Theory of Modulational Polarization Instabilities in a Birefringent Fiber

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Abstract

The nonlinear polarization changes of an intense pump wave in optical birefringent fibers [1, 2] may substantially affect the parametric gain spectra of a frequency detuned signal. Although this effect is important for several applications involving birefringent fibers in fiber lasers and switches, earlier analyses of parametric gain have been restricted to cases where no pump polarization rotation occurs [3]-[7]. In fact, only the cases where the input polarisation of the pump beam is coupled on either one of the birefringence axes, or equally split between the axes of a high-birefringence fiber, were considered. We present here the full pump-power dependence of the modulational gain spectra for an arbitrary input polarization state of the pump with respect to the birefringence axes. We believe that the present analysis is crucial for a proper description of the experimental results [8]-[10] and for assessing the practical applicability of the modulational instability gain for all-optical processing devices.

© 1996 Optical Society of America

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