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We design and numerically simulate a microstructure ring fiber, which supports 146 orbital angular momentum (OAM) modes at 1.1 μm and 70 OAM modes at 2.0 μm with flattened dispersion and low nonlinear coefficient. The fiber consists of an air hole at the center and a high refractive index ring between two well-ordered air hole rings in the cladding. It is found that the number of well-separated OAM...