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提出了一种新型的基于菱形空气孔的单一偏振单模太赫兹光子晶体光纤,通过改变光纤中引入缺陷的个数、尺寸以及所处位置,研究其对光纤单一偏振单模特性的影响。全文仿真建模采用全矢量有限元法,结果表明:当光纤中引入两缺陷时,随着缺陷尺寸的增加,单一偏振单模运行区域向高频方向移动,区域宽度稍有增加;当引入四缺陷时,靠近芯区的缺陷对单一偏振单模特性影响占主导;基于此,在芯区四周各引入尺寸相同的缺陷,对比四缺陷和两缺陷时的情况发现,四缺陷时单一偏振单模运行区域(1.07~1.36THz)向高频方向移动,且区域宽度(为0.29THz)增加明显,是两缺陷时的1.32倍。此类光纤可应用于某些对偏振态有非常严格要求的系统中,故具有实际意义。
A new type of monolayer single mode THz photonic crystal fiber based on rhombic air holes was proposed. The effect of single mode polarization on the single mode polarization of the fiber was investigated by changing the number, size and position of the introduced defects in the fiber. Full-fidelity finite element method was used to simulate the whole paper. The results showed that when two defects were introduced into the optical fiber, the single-polarization single-mode operating region moved toward the high-frequency region with a slight increase in defect size. In the case of defects, the defects close to the core area dominate the single-polarization single-mode characteristics. Based on this, the defects of the same size are introduced around the core regions. When four defects and two defects are compared, The operating area (1.07 ~ 1.36THz) moves in the high frequency direction, and the area width (0.29THz) increases obviously, which is 1.32 times of the two defects. Such optical fiber can be applied to some very strict requirements on the polarization state of the system, it is of practical significance.