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微结构芯大模场平顶光纤及其传输特性分析*
Investigation on large-mode-area flat-topped optical fiber with microstructured core and its transmission characteristics
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摘要: 通过在纤芯引入非均匀分布的高折射率介质柱，获得了大模场面积、平顶型模场分布的新型微结构光纤.运用数值仿真，分析了光纤在不同的结构参数下的模场面积、基模模场分布等特性.研究结果表明：通过合理设计光纤的包层和纤芯参数，可以实现有效的平顶模场分布.在工作波长为1064 nm时，平顶光纤的基模模场面积可以达到1655μm2.Abstract: A novel microstructured-core optical fiber with large mode area and flat-topped mode field distribution is proposed. The core of the fiber is composed of high refractive index dielectric cylinders with a non-uniform distribution. Numerical simulation on the mode area, mode field distribution of the fundamental mode and other aspects of the fiber indicates that the fiber can effectively obtain flat-topped mode field distribution by tuning the parameters of the cladding and the core of the fiber. In addition, the flat-topped fiber has a large mode area of 1655 μm2 at the operating wavelength of 1064 nm.
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