Abstract
We experimentally demonstrate the possibility of quasi-adiabatic conversion of ${{\rm LP}_{11}}$ modes to vortex modes in a twisted highly birefringent fiber with a gradually increasing twist rate. Based on the value of the effective indices, the ${{\rm LP}_{11}}$ modes are selectively converted to right- and left-handed circularly polarized vortex modes ${{\rm HE}_{21}}$ with a total angular momentum of $\pm {2}$ and to quasi-${{\rm TE}_{01}}/{{\rm TM}_{01}}$ modes with a total angular momentum of 0. Since the proposed conversion method has a purely topological origin, it is broadband in nature, in contrast to the methods based on resonant effects.
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