Abstract. Rapidly space-division multiplexing (SDM) techniques have drawn attention because the traditional available physical dimensions to orthogonally multiplex data have been almost exhausted. Few-mode fiber becomes a viable option to realize a high-density SDM system. Thus, we propose an air-hole assisted elliptical ring fiber. Four air-holes are introduced surrounding the elliptical ring fiber, and one air-hole is in the core, which can prevent higher-order modes to be cutoff and improve the degeneracy between modes to achieve multiple-input multiple-output-free data transmission. This fiber can support 14 modes in a wide wavelength range from 1.52 to 1.58 μm (h = 5.0 μm, dx = 0.3 μm, and dy = 1.1 μm), and the effective index difference of its adjacent modes is larger than 1.25 × 10 − 4. The fiber we designed would be a strong candidate for SDM to improve optical transmission capacity.

中文翻译：

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用于无MIMO数据传输的气孔结构少模光纤设计

摘要。快速空分复用 (SDM) 技术引起了人们的关注，因为正交复用数据的传统可用物理维度几乎已用尽。少模光纤成为实现高密度 SDM 系统的可行选择。因此，我们提出了一种气孔辅助椭圆环光纤。椭圆环光纤周围引入4个气孔，纤芯1个气孔，可防止高阶模式被截断，改善模式间的简并性，实现多输入多输出无数据传输. 该光纤可在1.52~1.58 μm（h=5.0 μm，dx=0.3 μm，dy=1.1 μm）的宽波长范围内支持14种模式，其相邻模式的有效折射率差大于1.25×10 − 4.