A broadband and single-polarization filter based on high birefringence photonic crystal fiber (HB-PCF) with selectively infiltrated gold wires and liquid crystal is proposed, and its filtering characteristics are studied by the full-vector finite element method (FV-FEM). Two gold wires are selectively filled on both sides of the liquid crystal core to act as two defect cores. The results show that the confinement loss of x-polarized core mode is much larger than that of y-polarized core mode in the wavelength range of 0.85–1.75 μm. The confinement losses of x- and y-polarized core modes are 99.87 dB/cm and 0.001 dB/cm at 0.88 um, 726.50 dB/cm and 0.004 dB/cm at 1.02 um, and 474.60 dB/cm and 0.046 dB/cm at 1.30 um, respectively. The bandwidth with extinction ratio less than 20 dB is 900 nm. Moreover, compared with the traditional structures, we find that our structure has higher birefringence. High birefringence helps to separate the resonant wavelengths of x- and y-polarized core modes. Therefore, the excellent properties of the proposed filter can make it widely used in sensing systems and broadband optical communication systems.

提出了一种基于高双折射光子晶体光纤（HB-PCF），金线和液晶选择性渗透的宽带单偏振滤波器，并通过全矢量有限元法（FV-FEM）研究了其滤波特性。两条金线选择性地填充在液晶芯的两侧，以充当两个缺陷芯。结果表明，在0.85–1.75μm的波长范围内，x极化纤芯模式的限制损耗比y极化纤芯模式的更大。x和y极化核心模式的限制损耗在0.88 um时为99.87 dB / cm和0.001 dB / cm，在1.02 um时为726.50 dB / cm和0.004 dB / cm，在474.60 dB / cm和0.046 dB / cm时分别为1.30微米。消光比小于20 dB的带宽为900 nm。而且，与传统结构相比，我们发现我们的结构具有更高的双折射。高双折射有助于分离x和y偏振核心模式的共振波长。因此，所提出的滤波器的优异性能可以使其广泛用于传感系统和宽带光通信系统中。