In this paper, a trench-assisted large-mode-field-area multi-core fiber with an air-hole structure composed of 21 conventional fiber cores and 16 air holes is proposed, and it can realize dual-mode transmission. By adjusting the structural parameters, the effective mode field area of fundamental mode can be up to 1916.042 µm 2 at 1550 nm. In addition, the fiber has good bending characteristics by adding a trench with a lower refractive index than the cladding. When the bending radius is 1.4 cm, the bending loss is low to 2.96 × 10 –3 dB/m. This fiber is of great significance for the design of bending insensitive fiber.

中文翻译：

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带气孔沟槽辅助大模场面积多芯光纤的设计与分析

本文提出了一种由21个常规纤芯和16个气孔组成的气孔结构的沟槽辅助大模场面积多芯光纤，可实现双模传输。通过调整结构参数，基模有效模场面积在1550 nm处可达1916.042 µm 2 。此外，通过添加折射率低于包层的沟槽，光纤具有良好的弯曲特性。当弯曲半径为 1.4 cm 时，弯曲损耗低至 2.96 × 10 –3 dB/m。这种光纤对于弯曲不敏感光纤的设计具有重要意义。