Abstract
Orbital angular momentum (OAM) modes, featured by the unique properties of the helical phase front and annular intensity profile, have shown enormous potential for a wide range of applications. Optical fibers with ring-shape profile have been experimentally proven for supporting stable OAM beam propagation. In most instances, managing the chromatic dispersion is of vital importance in a variety of optical fiber systems. In this paper, we summarize optical fibers with concentric ring cores for extremely dispersive OAM modes. The properties of the OAM mode in double ring-core fiber are presented, including the effective refractive index, effective mode area, power integral ratio, chromatic dispersion, and loss. Photonic crystal fiber and triple ring-core fiber, which share the same operation principle for dispersive OAM modes as the one in the dual-ring fiber, are also briefly introduced.
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