Abstract
In this paper, based on the silica-based ring-core photonic crystal fiber (PCF) used to transmit orbital angular momentum (OAM) modes, the effects of central air hole and first-layer cladding air holes on the dispersion of ring-core PCF are analyzed. As a result, it is found that the sizes of air holes have a regular regulation effect on the dispersion of PCF. Furthermore, a ring-core PCF which can support 44 OAM modes in communication band is proposed. The characteristics of the designed ring-core PCF, such as number of supported modes, dispersion, nonlinear coefficient and confinement loss, are systematically analyzed by using the finite element method (FEM). In summary, the conclusion is of guiding significance for the design of silica-based ring-core PCF structures, and the designed ring-core PCF has potential applications in the high-capacity fiber communication.
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