We propose and design a tapered polarization splitter (PS) using the single-polarization property of an elliptical-hole core circular-hole holey fiber (EC-CHF). It is reported that polarization splitting without any crosstalk is enabled using the PS with EC-CHF. In this paper, we show that the mode coupling is enhanced with a tapered PS structure, and the full waveguide separation at the input and output ends can be simultaneously realized. We also propose a full-vectorial finite element beam propagation method using coordinate transformation to efficiently analyze a waveguide whose structure varies along the longitudinal direction. In this approach, computational accuracy and efficiency are greatly improved.

中文翻译：

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基于EC-CHF的全矢量FE-BPM坐标变换设计锥形偏振分束器

我们提出并设计了一种利用椭圆孔芯圆孔多孔光纤（EC-CHF）的单偏振特性的锥形偏振分束器（PS）。据报道，使用带有EC-CHF的PS可以实现没有任何串扰的偏振分裂。在本文中，我们表明，采用锥形PS结构可以增强模式耦合，并且可以同时实现输入端和输出端的完全波导分离。我们还提出了一种使用坐标变换的全矢量有限元光束传播方法，以有效地分析结构沿纵向变化的波导。用这种方法，大大提高了计算精度和效率。