论文部分内容阅读
提出了一种基于双芯光子晶体光纤(PCF)的具有短长度和超高消光比的偏振分束器,利用全矢量有限元法(FEM)对双芯PCF的耦合特性和偏振分束器的性能进行了数值研究。研究结果表明:增大纤芯间椭圆孔椭圆率、适当提高掺杂折射率可显著降低双芯PCF的耦合长度;基于该双芯PCF设计的偏振分束器在1.55 mm波长处,长度为0.58 mm时,可以实现x,y偏振态的分离,消光比达到82.33 d B,消光比高于20 d B的带宽为70 nm,高于10 d B的带宽达到110 nm,覆盖了C+L波段。这为设计具有短长度、高消光比、宽带特性的PCF偏振分束器提供了一种新的结构。
A polarization beam splitter with short length and ultra-high extinction ratio based on dual-core photonic crystal fiber (PCF) is proposed. The coupling characteristics of full-bounded FEM (FEM) to double-core PCF and polarization beam splitter Performance of the numerical study. The results show that increasing the elliptic ellipticity of the core and increasing the doping index can reduce the coupling length of the dual-core PCF. The polarization beam splitter based on the double-core PCF has a length of 0.58 mm, the polarization state of x and y can be separated, the extinction ratio reaches 82.33 d B, the bandwidth with extinction ratio higher than 20 d B is 70 nm, and the bandwidth above 10 d B reaches 110 nm, covering the C + L band . This provides a new structure for the design of PCF polarizing beamsplitters with short length, high extinction ratio and broadband characteristics.