基于多芯光纤超模干涉的温度传感器  

Temperature Sensor Based on Multicore Fiber Supermode Interference

作　　者：闫栋 陈南光 田振[1] 姚一村[1] 张丽强 Yan Dong;Chen NanKuang;Tian Zhen;Yao Yicun;Zhang Liqiang(School of Physics Science and Information Technology,Liaocheng University,Liaocheng,Shandong 252000,China)

机构地区：[1]聊城大学物理科学与信息工程学院,山东聊城252000

出　　处：《激光与光电子学进展》2021年第7期168-173,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61875247);聊城大学科技处高层次启动费(31805180101);聊城大学发展规划与学科建设处建设经费(319190301)。

摘　　要：研究了锥型多芯光纤模间耦合所产生的干涉在温度传感中的应用。利用弱耦合多芯光纤拉锥后变成强耦合多芯光纤,从而产生超模干涉的特点,在单模光纤中熔接一段弱耦合七芯光纤。经氢气火焰匀速往返拉锥后,该光纤直径变小,芯间距减小到一定程度后产生超模干涉,从而得到了结构简单、灵敏度高、特异性强的温度传感器。研究发现,拉锥后的光纤直径越小、锥区长度越长,模间耦合越强。选取锥区长度为1.8μm、锥区直径为31.36μm的锥型多芯光纤,所设计制作的温度传感器的灵敏度可达840 pm/℃,比之前报道的高约52.7倍。This paper studies the application of interference caused by mode coupling in a tapered multicore fiber to temperature sensing.A weakly coupled multicore fiber becomes a strongly coupled multicore fiber after being tapered and has characteristics of supermode interference.A weakly coupled seven-core fiber is fused into a singlemode fiber after being pulled back and forth by a hydrogen flame at a uniform speed.When the diameter of the optical fiber decreases and distance between cores is reduced to a certain extent,supermode interference occurs,thus temperature sensor with simple structure,high sensitivity,and strong specificity is fabricated.It is determined that the smaller the fiber diameter and the longer the taper length,the stronger the mode coupling.A tapered multicore fiber with a cone length of 1.8μm and a cone diameter of 31.36μm was selected.The sensitivity of the designed temperature sensor reaches 840 pm/℃,which is 52.7 times higher than the previously reported value.

关 键 词：光纤光学 多芯光纤 超模干涉 温度 传感器 

分 类 号：TN253[电子电信—物理电子学]