提出了一种抗弯曲大模场面积双模光子晶体光纤。采用全矢量有限元法结合完美匹配层边界条件分析了光纤的传输特性，并讨论了弯曲特性与弯曲半径及弯曲方向角的关系。通过优化结构参数，在工作波长1550 nm 处，光纤可保持基模HE11 和二阶模HE21 双模运转。平直状态和35 cm 弯曲半径下HE11 模和HE21 模的模场面积均大于1000 mm2，弯曲损耗小于0.075 dB/m。该光纤可有效抑制弯曲形变导致的模场面积减小，最小弯曲半径可达10 cm，弯曲方向角范围可以扩展至±180°。所设计的双模光纤具有大模场面积、低弯曲损耗、对弯曲方向不敏感等优势，在高功率光通信器件领域具有重要的应用价值。

A bend-resistant large-mode-area dual-mode photonic crystal fiber is proposed. The transmission properties are analyzed with full vector finite element method combined with perfectly matched layer boundary conditions, and the variation of bending properties with the bending radius and bending orientation angle are discussed. By optimizing the structure parameters, the fiber can only transfer the fundamental mode HE11 and second-order mode HE21 at a wavelength of 1550 nm. When the fiber is in a straight state or the bending radius is 35 cm, mode field area of the mode HE11 and HE21 are greater than 1000 mm2, and the bending loss is lower than 0.075 dB/m. Besides, the fiber can effectively inhibit the decrease of mode field area that results from the bending deformation. The minimum bending radius can reach 10 cm, and the bending orientation angle can be extended to ± 180° . The designed fiber with large mode area, low bending loss and low sensitivity of bending orientation has important applications in high power optical communication devices.