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Stimulated Brillouin scattering (SBS) generated from noise in small-core photonic crystal fibers (PCFs) exhibits a strong dependence on pump polarization. The polarization dependence of two small-core PCFs is investigated, yielding unexpected results. Both fibers exhibit birefringence resulting in a 90° polarization dependence for the SBS and a 3 dB difference in the SBS threshold between polarizations corresponding to minimum and maximum SBS, respectively. Surprisingly, the transmission of the smaller-core fiber also exhibits a 180° polarization dependence at lower powers due to polarization-dependent loss.
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McElhenny et al. (2008) studied this question.
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