Dispersions of robust optical vortices in multihelicoidal fibers with torsional mechanic stress

We study the structure of higher order modes in multihelicoidal optical fibers (MHFs) in the presence of torsional mechanic stress (TMS). We show that at some values of pitch such modes present circularly polarized non-degenerate optical vortices robust to external perturbations of the cross section’s form. Basing on analytical expressions for propagation constants of such vortex modes we investigate polarization, topological and hybrid dispersions of vortex modes. We also demonstrate that based on MHF with TMS one can implement a universal CCNOT logic gate (also known as “Toffoli gate”). This property could be useful for classical emulation of quantum computations.