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In this paper, we propose and design a Ge-doped air-core ring fiber, which can support a large amount of OAM modes for mode-division multiplexing (MDM) in optical fiber communications. By varying the mole fraction of GeO2 and adjusting the structure parameter, including the air-core radius and the GeO2-doped ring width, we investigate the influence of different fiber parameters on the total supported OAM mode number. The hollow silica fiber with a 50-m air core and a 1.5-m thickness ofdoi:10.1109/access.2021.3078504 fatcat:cwmc7asxtjgphghbfgrp4jtkaa