A ring core photonic crystal fiber (RC-PCF) is proposed and studied. The RC-PCF supports 124 orbital angular momentum modes at 1.55 mu m. The RC-PCF is optimised in the range of 1.3-1.6 mu m. The proposed PCF is composed of a high index ring of lithium niobate (LiNbO3) in the background layer of silica. The circular air holes are distributed among the four rings in the cladding region. The central core region is composed of elliptical air holes arranged in an optimised configuration. The RC-PCF features flat dispersion (similar to 0.5 ps/nm/km) in the tested wavelength range and low confinement loss ( 10(-4)) to high bend radius (B-R similar to 2 cm). The proposed PCF is a potential candidate for multimode applications.
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