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本文提出了一种具有双模特性大模场面积的微结构光纤,通过有限元法计算其模场分布、基模有效模场面积及弯曲损耗特性,并分析了不同结构参量对限制损耗及有效模场面积的影响.计算结果表明:通过合理地改变光纤结构参量,可以使二阶模LP11、三阶模EH11截止,实现基模LP01、三阶模HE31双模传输,其中基模的有效模场面积可达700μm2.这种结构的光纤制作简单,在大容量光纤传输系统中具有重要应用.
In this paper, a kind of microstructured optical fiber with large mode field area is proposed. Its mode field distribution, effective mode field area and bending loss characteristics are calculated by finite element method. The effects of different structure parameters on limiting loss and effective The results show that the second-order mode LP11 and the third-order mode EH11 can be cut off by reasonably changing the optical fiber structure parameters, and the dual-mode transmission of the fundamental mode LP01 and the third-order mode HE31 can be realized. The effective mode Field area up to 700μm2. This structure of the fiber production simple, large-capacity optical fiber transmission system has important applications.