【摘要】 为了在太赫兹波段实现远距离宽频带传输,设计了一种具有低吸收损耗的环烯烃共聚物(COC)作为基底材料双包层太赫兹光子晶体光纤。利用全矢量有限元法及模式选择理论,数值模拟了该光纤的单模传输范围、限制损耗、色散以及有效模场面积等特性。结果表明:优化结构参数可使在1~10 THz范围内基模限制损耗小于0.1 dB/m,二阶模限制损耗大于1 dB/m。因此可以获得1~10 THz的宽频带单模传输并且在1.5~10 THz内群速度色散可以控制在±0.1 ps/(THz·cm)。更多还原

【Abstract】 In order to realize long distance and broadband transmission of terahertz wave,a doublecladding terahertz photonic crystal fiber was designed based on Topas cyclic olefin copolymer with low loss. The single-mode transmission range,confinement loss,dispersion and effective area of the double-cladding terahertz photonic crystal fiber were investigated by using the full-vector finite element method( FEM) and the mode choice theory. The results show that the confinement loss of the fundamental mode is far less than 0. 1 d B / m and the confinement loss of second-order mode loss is larger than 1 d B / m at frequency range of 1- 10 THz by tailoring the structure parameters. The broadband single mode transmission operates at bandwidth of 1- 10 THz,and the group velocity dispersion( GVD) can be controlled at ± 0. 1 ps /( THz·cm) in the range of 1. 5- 10 THz.更多还原