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Transformation of phase and polarization of laser light in multimode fibers

We are shown that the using of holographic method for system fibers-hologram forms phase and linear polarized homogeneous beams. The image formed on fiber entrance is reconstructed at definite length of fiber. The rotation of this image corresponds to different azimuts of linear polarization. Observed transformations of fase and polarisation are caused by LV-mode waves and waveguide topological birefringence.