Novel types of mode dispersion of optical vortices in twisted optical fibers

Abstract

We demonstrate that there are three possible types of mode dispersion of optical vortices with topological charge |ℓ| ≥ 1 in step-index twisted fibers: polarization, topological and hybrid mode dispersion. We established that the values of these types of the dispersion are different for each pair of optical vortices with |ℓ| > 1, which is a result of the influence of twisted mechanical stress. We numerically obtained certain fiber parameters to minimize the dispersion.