In this paper, a multi-core fiber with 22 air holes and 15 conventional cores is proposed. The fiber can realize dual-mode operation of fundamental mode HE₁₁ and second-order mode HE₂₁ under certain conditions. The relationship between performance of the fiber and the structural parameters that include core pitch, refractive index difference between core and cladding, and fiber core radius is investigated systematically. By adjusting the above parameters, the effective area of fundamental mode can be up to 1423.972 µm² and keep a low bending loss at 1550 nm. Due to its flexibility of the structure, the proposed fiber is significant for theoretical research and practical manufacturing.

在本文中，提出了一种具有 22 个气孔和 15 个常规纤芯的多芯光纤。该光纤在一定条件下可实现基模HE ₁₁和二阶模HE ₂₁双模工作。系统地研究了光纤性能与包括纤芯间距、纤芯和包层之间的折射率差以及纤芯半径在内的结构参数之间的关系。通过调整上述参数，基模有效面积可达1423.972 µm ^{2 ，}并在1550 nm处保持较低的弯曲损耗。由于其结构的灵活性，所提出的纤维对于理论研究和实际制造具有重要意义。