CAJ | 학술논문

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6 mm的光纤在0.2~1.5 THz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0.85~1.1 THz波段有低于3 dB/m的三个窗口；特别是在0.99 THz，损耗达到0.208 dB/m。芯径为3 mm、4.8 mm和6 mm的光纤在0.8~1.5 THz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7 cm ，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22 cm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：6 mm芯径的光纤样品在1.27 THz的平均损耗为2.175 dB/m，与该频率的理论损耗(1.95 dB/m)接近。
이배희경공취물(cyclic-olefin copolymer，COC)재료위기질，설계、제조료일충공심다공포층태혁자(THz)섬유。이용comsol연건모의료심경위6 mm적광섬재0.2~1.5 THz파단적손모특성，결과표명：재0.85~1.5 THz파단존재다개저손모빈대，이차재0.85~1.1 THz파단유저우3 dB/m적삼개창구；특별시재0.99 THz，손모체도0.208 dB/m。심경위3 mm、4.8 mm화6 mm적광섬재0.8~1.5 THz파단적손모특성대비분석표명：해COC미결구다공포층공심섬유적손모수착광섬외경적증가이감소。파설계적태혁자섬유외경방대7배체도7 cm ，거차설계제조료광섬예제봉성형전용모구。차조열제출성형방법득도료결구완정、공동표면광활，장도위22 cm적공심다공포층예제봉。이용해실험실독유적미결구광섬랍사탑，성공획득료미결구보지완호적광섬양품。손모분석결과표명：6 mm심경적광섬양품재1.27 THz적평균손모위2.175 dB/m，여해빈솔적이론손모(1.95 dB/m)접근。
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 2.175 dB/m in 1.27 THz and it is near the theoretical loss (1.95 dB/m).