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提出了一种新型超宽带双芯光子晶体光纤偏振分束器.应用全矢量有限元法,系统地研究了光纤结构参数对偏振分束器带宽和偏振分束器长度的影响.分析结果表明:增加掺氟区折射率,既能提高分束器带宽,也能减少分束器长度;增大光纤中空气孔的孔距及孔径与孔距比,可以增加分束器的带宽,但同时也会导致分束器的长度增大,使得器件尺寸增大.因此,在设计中需兼顾分束器的带宽和长度来选取光纤的结构参数.通过结构参数的优化,设计出一种短长度、高消光比和超宽带的偏振分束器,其长度为7.362 mm,消光比高于20 dB的带宽为600 nm.
A new type of ultra-wideband dual-core photonic crystal fiber polarization beam splitter is proposed. By using full vector finite element method, the influence of fiber structure parameters on the polarization beam splitter bandwidth and polarization beam splitter length is investigated systematically. Increasing the refractive index of the doped fluorine region can not only increase the beam splitter bandwidth but also reduce the beam splitter length. Increasing the pitch of the air holes in the fiber and the ratio of the aperture to the pitch can increase the beam splitter bandwidth, but at the same time The length of the beamsplitter will increase and the size of the device will increase.Therefore, the design needs to take the bandwidth and length of the beamsplitter into account to select the fiber’s structural parameters.According to the optimization of the structural parameters, a short length, The high extinction ratio and ultra-wideband polarization beam splitter has a length of 7.362 mm and a bandwidth of 600 nm for extinction ratios above 20 dB.