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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6mm的光纤在0.2~1.5THz波段的损耗特性,结果表明:在0.85~1.5 THz波段存在多个低损耗频带,而且在0.85~1.1THz波段有低于3 dB/m的三个窗口;特别是在0.99THz,损耗达到0.208dB/m。芯径为3mm、4.8mm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。
Based on the cyclic-olefin copolymer (COC) material, a hollow core porous THz (THz) fiber was fabricated. The comsol software was used to simulate the loss characteristics of a fiber with a core diameter of 6mm in the band of 0.2-1.5THz. The results show that there are many low-loss bands in the 0.85-1.5 THz band and less than 3dB / m of the three windows; especially at 0.99THz, loss of 0.208dB / m. Comparative analysis of the loss characteristics of the optical fiber with core diameter of 3mm, 4.8mm and 6mm in 0.8 ~ 1.5THz band shows that the loss of the hollow core fiber of COC microstructure decreases with the increase of optical fiber outer diameter. The design of the THz fiber diameter 7 times enlarged to 7cm, thus designing and manufacturing of optical fiber preform molding special mold. With the help of hot extrusion method, a hollow core porous preform with a complete structure and a smooth surface with a length of 22 cm was obtained. Using the unique microstructured optical fiber drawing tower of this laboratory, successfully obtained optical fiber samples with well-preserved microstructure. The results of the loss analysis show that the average loss of a 6mm core fiber at 1.27 THz is 2.175 dB / m, which is close to the theoretical loss of this frequency (1.95 dB / m).