基于光纤Fabry-Perot滤波的光纤激光温度传感系统  

Temperature sensing system of fiber laser based on fiber Farby-Perot filter

作　　者：杨帆 李邵德 刘灏冲 何巍[1,2] YANG Fan;LI Shaode;LIU Haochong;HE Wei(Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument,Beijing Information Science&Technology University,Beijing 100192,China;Beijing Laboratory of Optical Fiber Sensing and System,Beijing Information Science&Technology University,Beijing 100192,China)

机构地区：[1]北京信息科技大学光电测试技术及仪器教育部重点实验室,北京100192 [2]北京信息科技大学光纤传感与系统北京实验室,北京100192

出　　处：《光学技术》2024年第4期453-458,共6页Optical Technique

基　　金：国家自然科学基金项目(52105540);河南省教育厅科技攻关项目(222102210254)。

摘　　要：提出并设计了一种基于氢氟酸腐蚀技术制备光纤微腔的方法,并通过熔接4.5mm长的单模光纤构成全光纤(Fabry-Perot,F-P)多光束干涉滤波结构,其主干涉谱周期为20.7nm,次级干涉谱周期为1.4nm;在此基础上,以光纤F-P滤波器作为选频器件搭建了掺铒光纤激光系统,实现了中心波长1560.40nm,信噪比15.441dB,3dB线宽0.28nm的窄线宽激光输出。实验中通过温度加热平台分别对光纤F-P滤波器进行升温和降温实验,在360~430℃的温度实验范围内,升温过程中激光波长产生红移,传感系统的温度灵敏度为13.80pm/℃,线性拟合度为99.82%;降温过程中激光传感系统的温度灵敏度为13.36pm/℃,线性拟合度为99.44%。本研究为高精度高温传感提供了一种激光系统测量方法。A method of fabricating optical fiber microcavity based on hydrofluoric acid etching technology is proposed and designed.An all-fiber(Fabry-Perot,F-P)multi-beam interference filter structure is formed by welding a 4.5mm long single-mode optical fiber.The main interference spectrum period is 20.7nm and the secondary interference spectrum period is 1.4nm;on this basis,the fiber F-P filter as the frequency selection device constitute an erbium-doped fiber laser system,and narrow linewidth laser output with center wavelength of 1560.40nm,signal to noise ratio of 15.441dB and 3dB linewidth of 0.28nm is realized.In the experiment,the optical fiber F-P filter was heated and cooled by the temperature heating platform in the experimental temperature range of 360~430℃.The laser wavelength was red-shifted during the heating process,and the temperature sensitivity of the sensing system was 13.80pm/℃,the linear fitting degree is 99.82%;the temperature sensitivity of the laser sensing system during the cooling process is 13.36pm/℃,and the linear fitting degree is 99.44%.The experimental results provide a laser system measurement method for high-precision high-temperature sensing.

关 键 词：光纤F-P滤波器 光纤激光器 氢氟酸 光纤温度传感 

分 类 号：TN253[电子电信—物理电子学]