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.
A novel dual-mode large-mode-area micro-structured fber is proposed.The characteristics of mode feld distribution,efective area of fundamental mode,and bending loss based on FEM(fnite element method) are analyzed.And the efects of all structured parameters on the confnement loss and efective area are discussed.Results show that this structure makes the frst HOM(LP11) and the second mode(EH11) cut of,and it achieves dual-mode transmission in the fber by adjusting the structural parameters.The efective area of a fundamental mode is approximately 700 μm2.The dual-mode large-mode-area micro-structured fber can be used in large-capacity fber transmission.