We design a graded-index ring-core fiber with a GeO 2 -doped silica ring core and SiO 2 cladding. This fiber structure can inhibit the effect of spin-orbit coupling to mitigate the power transfer among different modes and eventually enhance the orbital angular momentum (OAM) mode. To address the issues of limited orbital angular momentum (OAM) mode count, poor transmission quality, and complex cladding structures in ring-core photonic crystal fibers, a novel OAM-supporting ring-core anti-resonant photonic crystal fiber is designed. By. tally demonstrated. Compared to few-mode fiber, the Rayleigh backscattering of high-order orbital momentum mode supported by ring-core fiber bea 1, 2, 3 in an RCF.
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