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A metal-filled photonic crystal fiber (PCF) polarization filter based on surface plasmon resonance (SPR) is proposed and designed. The structure of the cross-section of a PCF is composed of a hexagonal lattice of air holes, in which an air hole is selectively filled with metal. We realize the polarization filter at the communication wavelengths of 1.31 and 1.55 &#x03BC;m with optimized structural parameters. The losses of the X polarization mode are 25126.44 and 22444.54 dB/m, while the losses of the Y polarization mode are about 1375.81 and 358.62 dB/m at the resonance wavelengths 1.31 and 1.55 &#x03BC;m, respectively. Therefore, the two light polarizations can be clearly separated. When the fiber length is 600 &#x03BC;m, cross-talk is over 20 dB at the communication wavelengths, while the achieved bandwidth is 160 and 200 nm at 1.31 and 1.55 &#x03BC;m, respectively. Furthermore, the distance between the resonance peaks of the two polarizations can reach 267 nm at 1.55 &#x03BC;m, achieving a significantly higher value than previously reported. These results are of great significance for the development of a polarization filter applicable in targeted communication bands.

ieee photonics journal

Design of a Metal-Filled Photonic-Crystal Fiber Polarization Filter Based on Surface Plasmon Resonance at 1.31 and 1.55&#x00A0;<inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m

Design of a Metal-Filled Photonic-Crystal Fiber Polarization Filter Based on Surface Plasmon Resonance at 1.31 and 1.55 $\mu$m