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提出了一种具有二重对称性的ZrF4-BaF2-LaF3-AlF3-NaF(ZBLAN)氟化物玻璃基的光子准晶光纤.光纤结构是以ZBLAN氟化物玻璃为背景材料,外包层由圆形空气孔以正方形与正三角形分布组成的基本单元构成,在芯区两侧引入两个对称的葡萄柚空气孔,以增加光纤的双折射.应用全矢量有限元法,研究了光纤的双折射和限制损耗特性与结构参数的关系.通过优化光纤结构参数,在1800—2200 nm的波长范围内获得了具有单模传输特性的高双折射光纤,其模式双折射高达10-2,比普通保偏光纤高出两个数量级,与目前报道的采用椭圆空气孔微结构光纤获得的高双折射具有同样的量级.但与具有椭圆空气孔微结构光纤相比,提出的光纤结构更易于制作.研究结果为开辟2μm波段光器件的研究做出了有益的探索.
A double symmetric ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) fluoride glass-based photonic quasicrystal fiber is proposed.The optical fiber structure is based on ZBLAN fluoride glass, the outer cladding is composed of circular air The hole is composed of the basic unit consisting of a square and a regular triangle, and two symmetrical grapefruit air holes are introduced on both sides of the core to increase the birefringence of the fiber. The birefringence and the limitation of the fiber are studied by the full vector finite element method Loss characteristics and structure parameters.An optimized birefringence optical fiber with single-mode transmission is obtained in the wavelength range of 1800-2200 nm by optimizing the parameters of the optical fiber. The birefringence of the fiber is as high as 10-2, Which is two orders of magnitude higher than the currently reported high birefringence of elliptical air-hole microstructured fibers, but the proposed fiber structure is easier to fabricate than the elliptical air-hole microstructured fibers.Results In order to open up the research of 2μm wavelength optical devices, a useful exploration has been made.