液体填充光子晶体光纤中长周期光栅的温度传感特性分析  

Analysis of Temperature Sensing Characteristics of a Long-Period Grating Formed in a Liquid-Filled Photonic Crystal Fiber

作　　者：宋晓利[1] 白育堃[1,2] 任广军[3] 马秀荣[1] 陆颖[2] 姚建铨[2] 

机构地区：[1]天津理工大学计算机与通信工程学院通信器件与技术教育部工程研究中心,天津300384 [2]天津大学精密仪器与光电子工程学院激光与光电子研究所光电信息科学技术教育部重点实验室,天津300072 [3]天津理工大学电子信息工程学院天津市薄膜电子与通信器件重点实验室,天津300384

出　　处：《中国激光》2011年第12期133-137,共5页Chinese Journal of Lasers

基　　金：国家973计划(2010CB327801)资助课题

摘　　要：基于在折射率引导型光子晶体光纤(PCF)上写制长周期光栅(LPG),并填充折射率温度敏感型液体,提出了一种新型温度传感器。应用全矢量有限元法,计算了在六角形结构排列的大模场面积光子晶体光纤(LMA-PCF)的空气孔中填充液体乙醇前后,PCF的纤芯基模和包层模的模场分布和色散曲线。根据耦合模理论,分析了光子晶体光纤长周期光栅(PCF-LPG)的传输谱随温度变化的关系。研究表明,填充液体乙醇后,在-20℃～80℃范围内PCF-LPG传输谱中心波长随温度近似以线性变化,其温度敏感度为1.766nm/℃。Based on a long-period grating （LPG） formed in a index guiding photonic crystal fiber （PCF） that is filled with a liquid of temperature-sensitive refractive index, a novel temperature sensor is proposed. Using a full-vector finite element method, the modal profiles and the dispersion curves of the core mode and the cladding mode of a large mode area photonic crystal fiber （LMA-PCF） are calculated with their hexagonally arrayed air-holes filled and unfilled with liquid ethanol, respectively. By means of the coupled-mode theory, the temperature dependence of the transmission spectrum of the PCF-LPG is studied. The result shows that in the temperature range from --20 ℃ to 80℃ the PCF-LPG resonance wavelength varies almost linearly with the temperature when the PCF is filled with liquid ethanol and the temperature sensitivitv is 1. 766 nm/℃.

关 键 词：光纤光学 温度传感器 长周期光栅 光子晶体光纤 耦合模理论 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]