基于新型光子晶体光纤近红外波段的传感特性  

Sensing Characteristics of Near-Infrared Band Based on New Photonic Crystal Fiber

作　　者：张文[1,2] 白冰冰 张砚曾 陈聪 邵齐元[1,2] 陈灿灿 王浩然 刘海 Zhang Wen;Bai Bingbing;Zhang Yanzeng;Chen Cong;Shao Qiyuan;Chen Cancan;Wang Haoran;Liu Hai(Engineering Research Center of Ministry of Education for Intelligent Control of Underground Space,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Information and Control Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学地下空间智能控制教育部工程研究中心,江苏徐州221116 [2]中国矿业大学信息与控制工程学院,江苏徐州221116

出　　处：《中国激光》2021年第7期110-118,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(51874301);徐州市重点研发项目(KC20162)。

摘　　要：利用有限元方法研究了八边形包层结构的光子晶体光纤的光学特性,并结合填充技术具体分析了光流体折射率对数值孔径、有效模场面积等参数的影响。通过在直波导中填充光学流体,可明显降低限制损耗,且在波长1.56μm处的限制损耗为0.00172 dB·m^(-1),色散参数为0.00018 ps·THz^(-1)·cm^(-2),相对灵敏度达66%。该八边形包层结构在宽波长范围内能够实现低色散的光信号传输,同时为高灵敏度的气体传感检测提供了新方案。Objective Photonic crystal fibers(PCFs)have wide applications in gas sensing,all-optical switching,four-wave mixing,and other fields due to its unique light control characteristics.In recent years,with the reduction of loss and cost,the sensors based on PCF have the characteristics of short absorption path and sensitive detection,which have become the focus of attention of researchers.However,many scholars have only optimized optical parameters such as sensitivity and limiting loss,ignoring the influence of the dispersion effect on the optical signal.When the dispersion is too large,it is very likely that the optical pulse will be broadened,causing the overlap of adjacent pulses.Therefore,the increase of the bit error rate will not be conducive to the propagation of light,so it is a challenge to reduce the dispersion and improve the detection sensitivity.Therefore,we have studied the octagonal PCF structure with multi-slot waveguides,which provides the possibility to achieve accurate detection of harmful gases,and at the same time achieves low-dispersion and flat-bandwidth optical signal transmission in the near-infrared wavelength range.Methods In the infrared spectrum of various gases,the uniqueness of the absorption band is of great significance for the trace amount of the gas.When a beam of light with an intensity of I0 passes through the photonic crystal fiber,the intensity of light passing through the gas to be measured changes due to the absorption of the light field by the gas to be measured,and the output light intensity I satisfies the Lambert-Beer law.The optimal structure is obtained through parameter optimization,and two grooves close to the core are filled with optical fluid to study the influence of optical fluid technology on optical properties.In order to ensure that the optical fluid only enters the core and not the cladding pores,the optical fluid can be slowly injected into the fiber through a small tip device such as a hypodermic needle or a cladding layer can be deposited on one end of the f

关 键 词：光子晶体 相对灵敏度 色散 气体检测 

分 类 号：TN25[电子电信—物理电子学]