中文摘要：

以环烯烃共聚物（cyclic-olefin copolymer，COC）材料为基质，设计、制造了一种空芯多孔包层太赫兹（THz）纤维。利用comsol软件模拟了芯径为6mml的光纤在0．2—1．5THz波段的损耗特性，结果表明：在0．85。1．5THz波段存在多个低损耗频带，而且在0．85—1．1THz波段有低于3dB／m的三个窗口：特别是在0．99THz，损耗达到0．208dB／m。芯径为3rain、4．8mln和6mm的光纤在0．8-1．5THz波段的损耗特性对比分析表明：该COC微结构多孔包层空芯纤维的损耗随着光纤外径的增加而减小。把设计的太赫兹纤维外径放大7倍达到7cm，据此设计制造了光纤预制棒成型专用模具。借助热挤出成型方法得到了结构完整、孔洞表面光滑，长度为22cm的空芯多孔包层预制棒。利用该实验室独有的微结构光纤拉丝塔，成功获得了微结构保持完好的光纤样品。损耗分析结果表明：6mm芯径的光纤样品在1．27THz的平均损耗为2．175dB／m，与该频率的理论损耗（1．95dB／m）接近。

英文摘要：

A hollow-core porous microstructured terahertz fiber based on Topas cyclic-olefin polymer （COC） was designed and manufactured. The loss characteristics of an optical fiber with outer diameter 10 mm was simulated using comsol software in the 0.2-1.5 THz band. There are several low-loss bands in the 0.85-1.5 THz, and there are three windows in which the loss is lower than 3 dB/m in the 0.85-1.1 THz band, the loss is about 0.208 dB/m especially in the 0.99 THz. By comparing the loss characteristics of the fiber with core diameter of 3 mm, 4.8 mm and 6 mm in 0.8-1.5 THz band, the loss was reduced with increasing the diameter. The outer diameter of designed THz fiber was enlarged to 7 cm, and a dedicated mold was designed for manufacturing preform. A 22 cm long THz fiber preform with a standard structure and smooth surface was manufactured by the hot extrusion molding method. Finally,through the laboratory＇s unique draw tower, the terahertz fiber of the core diameter of 3 mm, 4.8 mm and 6 mm were manufactured. The loss analysis result show that the average loss of the fiber with core diameter of 6mm is 2.175dB/m in 1.27THz and it is near the theoretical loss （1.95 dB/m）.