中文摘要：

提出了一种新型双空气孔多芯．双模一大模场面积光纤结构，计算了其模场分布、基模有效面积及弯曲损耗特性，分析了各结构参量对其有效折射率及有效面积的影响．这种结构在增大有效面积的同时使得二阶模的TE01，TM01模截止，实现双模传输，基模有效面积约为1044μm^2．调整其结构参量，甚至可以达到单模传输．这种结构制作简单、设计灵活，可用于高速大容量无源光纤及有源器件中．合理设计各结构参量，可以使有效面积达到3512μm^2。甚至更高，从而满足光通信领域中大容量、高功率传输等实际应用的需求．

英文摘要：

A novel double air hole multi-core dual-mode large-mode-area optical fiber is proposed. The characteristics of mode field distri- bution, effective area of fundamental mode, and bending loss are analyzed. And the effects of all structure parameters on the effective refractive index and effective area are discussed. This structure makes TErn and TM01 mode cut off, and it is of dual-mode trans- mission in the fiber. Besides, this structure can increase the effective area. The effective area of fundamental mode is approximately 1044μm2^. It is even able to achieve single-mode operation by adjusting the structure parameters. The fabrication of the structure is simple, and design is flexible. Therefore, it is suitable for the high-speed and large-capacity passive fibers as well as for active fibers. The effective area can reach or even exceed 3512 μm^2 by adjusting the structure parameters, in order to satisfy the practical demands of large-capacity high-power fiber transmission in the optical communications.