A novel photonic crystal fiber (PCF) based on pure silica is designed to transmit 114 orbital angular momentum (OAM) modes in the wavelength range of 1.2 μm–1.8 μm. The PCF composed of a central round air-hole, ring-shaped core, and air-hole array ensures effective refractive index differences of the constituent vector modes above 10⁻⁴ and stable transmission of the OAM modes. The finite element method is implemented to analyze the PCF. The confinement losses and nonlinear coefficients of all the eigenmodes at 1550 nm are less than 3.03 10⁻⁷ dB m⁻¹ and 1.30 w⁻¹ km⁻¹, respectively. In addition, the PCF shows higher effective refractive index difference, lower confinement loss, and nonlinear coefficient thus holding large promise in high-performance fiber communication systems.

一种基于纯二氧化硅的新型光子晶体光纤 (PCF) 设计用于在 1.2 μ m–1.8 μ m的波长范围内传输 114 个轨道角动量 (OAM) 模式。由中心圆形气孔、环形纤芯和气孔阵列组成的PCF保证了10 ^-4以上的组成矢量模式的有效折射率差和OAM模式的稳定传输。实施有限元方法来分析PCF。所有本征模式在 1550 nm 处的约束损耗和非线性系数都小于 3.03 10 ^-7 dB m ^-1和 1.30 w ^-1 km ^-1， 分别。此外，PCF 显示出更高的有效折射率差、更低的限制损耗和非线性系数，因此在高性能光纤通信系统中具有广阔的前景。