Abstract
We have studied the longitudinal evolution of spin angular momentum (SAM) in a system of two coupled anisotropic monomode optical fibres. On the basis of perturbation theory with degeneracy we have obtained the modes of such a system for various cases of mutual orientation of anisotropy axes and relations between anisotropy and exchange constants. We have provided their expressions in both local and global coordinate frames. We have studied the evolution of the SAM of individual fibres if one of the fibres is excited with linearly and circularly polarized light. We have shown that at certain points the specific SAM (SAM reduced to energy) suffers fast changing from +1 to −1, the spatial scale of such variations being small and determined by the ratio of the anisotropy constant to the inter-fibre exchange.
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