This article is cited in 1 paper

DIFFRACTIVE OPTICS, OPTICAL TECHNOLOGIES

Dispersion of optical vortices in twisted elliptical-core optical fibers with torsional stresses

B. P. Lapin, E. V. Barshak, D. V. Vikulin, C. N. Alexeyev, M. A. Yavorsky

V. I. Vernadsky Crimean Federal University, Simferopol

Abstract: In this paper, the dispersion of optical vortices (OVs) with a topological charge $l \geq 1$ 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 $l \geq 1$ 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

Received: 30.04.2023
Accepted: 05.07.2023

DOI: 10.18287/2412-6179-CO-1340