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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.
A novel microstructure fiber with large mode field area and flat top mode field distribution was obtained by introducing non-uniformly distributed high refractive index media into the fiber core. The numerical simulation was used to analyze the mode field of the fiber under different structural parameters Area and distribution of fundamental mode field.The results show that the effective flattened mode field distribution can be achieved by reasonably designing cladding and core parameters of the optical fiber.When the working wavelength is 1064 nm, Mode field area can reach 1655μm2.