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设计了一种三芯光子晶体光纤(PCFs)偏振分束器。利用光纤的谐振现象,实现了偏振状态的分离。当三芯光子晶体光纤中三个超模式的模式折射率满足一定条件时,将产生谐振现象。通过选择合适的光纤结构参数,可使某一偏振方向的光接近谐振条件,而另一偏振方向的光远离谐振条件。在光纤的输出端,由于耦合的程度不同,两个偏振光的功率集中在不同的纤芯区,从而达到分离偏振光的目的。应用有限元法(FEM)计算了三芯光子晶体光纤中的模式折射率,选择了合适的光纤结构参数。应用全矢量光束传播法(BPM)分析了这种光纤偏振分束器的性能。结果表明,在1.55μm工作波长上,长度为1.039 mm的光纤即能实现偏振状态的隔离,隔离度达到-36.98 dB,隔离度<-11 dB的带宽可达到24 nm。
A three-core photonic crystal fiber (PCFs) polarization beam splitter was designed. The use of optical fiber resonance phenomenon, the polarization state of the separation. Resonance occurs when the modes of the three supermodes in a three-core photonic crystal fiber satisfy certain conditions of refraction. By choosing suitable fiber structure parameters, the light in one polarization direction can be brought close to the resonance condition while the light in the other polarization direction can be kept away from the resonance condition. At the output of the fiber, due to the different degree of coupling, the power of the two polarized lights is concentrated in different core regions so as to achieve the purpose of separating the polarized light. The mode refractive index of three-core photonic crystal fiber was calculated by finite element method (FEM), and the suitable fiber structure parameters were selected. The performance of this fiber polarization beam splitter was analyzed using full vector beam propagation (BPM). The results show that the optical fiber with the length of 1.039 mm can achieve the polarization state isolation at the working wavelength of 1.55μm with the isolation of -36.98 dB and the bandwidth of <-11 dB with the isolation of up to 24 nm.