Temperature-sensing scheme based on a passively mode-locked fiber laser via beat frequency demodulation  

作　　者：罗健 王浩然 蔡勋 罗正钱 付宏燕 Jian Luo;Haoran Wang;Xun Cai;Zhengqian Luo;Hongyan Fu(Department of Electronic Engineering,School of Electronic Science and Engineering(National Model Microelectronics College),Xiamen University,Xiamen 361005,China)

机构地区：[1]Department of Electronic Engineering,School of Electronic Science and Engineering(National Model Microelectronics College),Xiamen University,Xiamen 361005,China

出　　处：《Chinese Optics Letters》2023年第2期28-32,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(No.61975167)。

摘　　要：In this paper,we propose a temperature-sensing scheme utilizing a passively mode-locked fiber laser combined with the beat frequency demodulation system.The erbium-doped fiber is used in the laser ring cavity to provide the gain and different lengths of single-mode fibers inserted into the fiber ring cavity operate as the sensing element.Different temperature sensitivities have been acquired in the experiment by monitoring the beat frequency signals at different frequencies.The experimental results indicate that the beat frequency shift has a good linear response to the temperature change.The sensitivity of the proposed sensor is about-44 kHz/℃ when the monitored beat frequency signal is about 10 GHz and the ratio of the sensing fiber to the overall length of the laser cavity is 10 m/17.5 m,while the signal-to-noise ratio(SNR)of the monitored signal is approximately 30 dB.The proposed temperature-sensing scheme enjoys attractive features such as tailorable high sensitivity,good reliability,high SNR,and low cost,and is considered to have great potential in practical sensing applications.

关 键 词：temperature sensing mode-locking fiber laser beat frequency 

分 类 号：TN248[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]