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Higher-order vector mode conversion in anisotropic circular optical fibers with torsional acoustic wave
D.V. Vikulin1, D.Y. Yavorsky1, B.P. Lapin1, C.N. Alexeyev1 and M.A. Yavorsky1

1V.I. Vernadsky Crimean Federal University, Prospekt Vernadskogo 4, Simferopol, 295007, Republic of Crimea, Russia

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DOI: 10.18287/COJ1792

Article ID: 1792

Language: Russian

Abstract:
In this paper, we study acousto-optic conversion of higher-order optical modes in a circular anisotropic optical fiber with a propagating fundamental torsional acoustic wave. Analytical expressions for the resonant optical eigenmodes and their propagation constants are obtained for the first time. Mutual conversion of linearly polarized optical vortices is theoretically shown, taking into account the optical frequency shift. The effect of sign inversion of the spin angular momentum of the circularly polarized optical vortex is established. Mutual conversion of higher-order vector HE- and EH-modes accompanied by a change in the mode type and its parity is demonstrated. A practically important property of the fiber system to implement effective parallel conversions of modes with different azimuthal numbers is revealed.

Keywords:
optical fiber, acousto-optic interaction, torsional acoustic wave, optical vortices, vector modes.

Acknowledgements:
This work was funded by the Ministry of Science and Higher Education of the Russian Federation under agreement No. 075-02-2025-1543 (model formulation, determination of resonant modes) and agreement No. FZEG-2026-0011 (research into the conversion of higher-order vector modes).

Citation:
Vikulin DV, Yavorsky DY, Lapin BP, Alexeyev CN, Yavorsky MA. Higher-order vector mode conversion in anisotropic circular optical fibers with torsional acoustic wave. Computer Optics 2026; 50(4): 1792. doi: 10.18287/COJ1792.

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