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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 d B/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 double-mode photonic crystal fiber with anti-bending mode area is proposed. The transmission characteristics of the fiber are analyzed by the full vector finite element method and the perfect matching layer boundary condition. The relationship between the bending property and bending radius and bending direction angle is discussed. By optimizing the structural parameters, the optical fiber can maintain the dual mode operation of the HE11 and the second-order HE21 at the working wavelength of 1550 nm. The mode field areas of the HE11 mode and the HE21 mode in the straight state and the bending radius of 35 cm are both larger than 1000 mm2 and the bending loss is less than 0.075 d B / m. The optical fiber can effectively restrain the reduction of the mode field caused by bending deformation, the minimum bending radius can reach 10 cm, and the bending direction angle range can be extended to ± 180 °. The designed dual-mode fiber has the advantages of large mode field area, low bending loss and insensitive to the bending direction, and has important application value in the field of high power optical communication devices.