红外与激光工程, 2019, 48 (7): 0717004, 网络出版: 2019-08-07   

全光纤粗锥MZ级联PCF-FP结构双参数特性研究

Dual-parameter characterization based on all-fiber waist-enlarged-bitapers MZ cascaded PCF-FP
周康鹏 1,2,*何巍 1,2张雯 1,2刘锋 1,2祝连庆 1,2
作者单位
1 北京信息科技大学 先进光电子器件与系统创新引智基地, 北京 100192
2 北京信息科技大学 光纤传感与系统北京实验室, 北京 100016
摘要
为了在测量NaCl溶液浓度的同时实现对温度的监测, 提出了一种基于马赫-曾德干涉仪(Mach-Zehnder Interferometer, MZI)级联法布里-珀罗干涉仪(Fabry-Perot Interferometer, FPI)的干涉型传感器。在单模光纤上通过熔融放电制作出一对腰锥直径155 ?滋m、间隔1.5 cm的MZI, 其对比度为10 dB、周期29.85 nm; 在MZI尾纤的一端与光子晶体光纤(Photonic Crystal Fiber, PCF)相对熔接并在距熔接点176 ?滋m处将PCF切平, 形成对比度为8 dB、周期为5.71 nm的FPI。实验选取1 535~1 555 nm波段MZI和FPI的干涉波谷特征波长, 在0~150 ℃的温度和0%~24%的NaCl溶液浓度变化范围内测得MZI的温度和折射率灵敏度分别为50 pm/℃和9.97 nm/RIU, 线性度均大于0.97; 而FPI的波谷特征波长对折射率不敏感, 温度灵敏度约为8.3 pm/℃, 线性度为0.98。最后, 通过构建温度-浓度函数关系矩阵得出了对温度和NaCl溶液浓度的灵敏度矩阵。该干涉型传感器对温度和NaCl溶液浓度表现出良好的灵敏度和线性度, 可实现上述双参数的同时测量。
Abstract
In order to meet the requirement of monitoring temperature change during the NaCl solution concentration measurement, an interferometric sensor based on Mach-Zehnder interferometer(MZI) cascaded Fabry-Perot interferometer(FPI) was proposed. The MZI was prepared by melting and splicing a single mode fiber to form a pair of tapers structure with diameter of 155 ?滋m at the waist an interval of 1.5 cm and the contrast and period of the MZI was 10 dB and 29.85 nm, respectively; Then a photonic crystal fiber (PCF) was spliced to one end of the MZI, cleaving the PCF at a distance of a 176 ?滋m from the splicing position, which a FPI was formed with contrast and period of 8 dB and 5.71 nm, respectively. By selecting the characteristic wavelength shifts of MZI and FPI interference dips in the range of 1 535-1 555 nm, in the temperature range of 30-150 ℃ and NaCl solution concentration range of 0%-24%, the temperature and refractive index sensitivities were 50 pm/℃ and 9.97 nm/RIU, respectively. The linearities were both greater than 0.97; While the interference dip of FPI was insensitive to the refractive index, and its sensitivity of temperature and linearity was 8.3 pm/℃ and 0.98, respectively. Finally, the sensitivity matrix for temperature and NaCl concentration was calculated by constructing the temperature-NaCl concentration function matrix. The interferometric sensor has good sensitivity and linearity to temperature and concentration of NaCl solution, which can realize the simultaneous measurement of the mentioned parameters.

周康鹏, 何巍, 张雯, 刘锋, 祝连庆. 全光纤粗锥MZ级联PCF-FP结构双参数特性研究[J]. 红外与激光工程, 2019, 48(7): 0717004. Zhou Kangpeng, He Wei, Zhang Wen, Liu Feng, Zhu Lianqing. Dual-parameter characterization based on all-fiber waist-enlarged-bitapers MZ cascaded PCF-FP[J]. Infrared and Laser Engineering, 2019, 48(7): 0717004.

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