Pan Xue-Peng, Sun Cai, Liu Shan-Ren, Wang Bo, Gao Meng-Meng, Guo Qi, Chen Qi-Dai, Sun Hong-Bo, Yu Yong-Sen
Opt Lett. 2023 Aug 1;48(15):3845-3848. doi: 10.1364/OL.496463.
A novel high-sensitivity temperature sensor based on a chirped thin-core fiber Bragg grating Fabry-Perot interferometer (CTFBG-FPI) and the Vernier effect is proposed and demonstrated. With femtosecond laser direct writing technology, two CTFBG-FPIs with different interferometric cavity lengths are inscribed inside a thin-core fiber to form a Vernier effect system. The two FPIs consist of two pairs of CTFBGs with a full width at half maximum (FWHM) of 66.5 nm staggered in parallel. The interferometric cavity lengths of the two FPIs were designed to be 2 mm and 1.98 mm as the reference arm and sensing arm of the sensor, respectively. The temperature sensitivity of this sensor was measured to be -1.084 nm/°C in a range of 40-90°C. This sensor is expected to play a crucial role in precision temperature measurement applications.
提出并演示了一种基于啁啾薄芯光纤布拉格光栅法布里 - 珀罗干涉仪（CTFBG - FPI）和游标效应的新型高灵敏度温度传感器。利用飞秒激光直写技术，在薄芯光纤内部写入两个干涉腔长度不同的CTFBG - FPI，以形成游标效应系统。这两个FPI由两对半高宽（FWHM）为66.
