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Dispersion of optical vortices in twisted elliptical-core optical fibers with torsional stresses
B.P. Lapin 1, E.V. Barshak 1, D.V. Vikulin 1, C.N. Alexeyev 1, M.A. Yavorsky 1

1 V.I. Vernadsky Crimean Federal University,
295000, Simferopol, Russia, Republic of Crimea, Prospekt Vernadskogo, 4

 PDF, 1451 kB

DOI: 10.18287/2412-6179-CO-1340

Pages: 53-60.

Full text of article: Russian language.

Abstract:
In this paper, the dispersion of optical vortices (OVs) with a topological charge l >= 1 in twisted elliptical fibers (TEF) with torsional stresses (TS) is studied. Analytical expressions for polarization, topological, and hybrid dispersion are derived from the spectra of vortex modes in step- and gradient-index TEFs with TS. It is shown that in strongly twisted fibers with a gradient refractive index profile, new types of dispersion appear in comparison with the case of a step-index profile. The dependence of the dispersion of OVs on the material and geometrical parameters of the fiber is studied numerically. It is established that in step-index TEFs with TS, there is a spectral region near which all types of dispersion for OVs with l >= 1 take a near zero value. It is also demonstrated that for TEFs with a gradient profile, this regime is realized for strongly twisted strongly elliptical fibers.

Keywords:
optical fiber, torsional mechanical stresses, dispersion, optical vortex.

Citation:
Lapin BP, Barshak EV, Vikulin DV, Alexeyev CN, Yavorsky MA. Dispersion of optical vortices in twisted elliptical-core optical fibers with torsional stresses. Computer Optics 2024; 48(1): 53-60. DOI: 10.18287/2412-6179-CO-1340.

Acknowledgements:
This work was financially supported by the Russian Science Foundation under project No. 23-22-00425.

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