分布式反馈激光器动态扫描光纤布拉格光栅波长解调系统  

Fiber Bragg grating wavelength demodulation system based on dynamic scanning of distributed feedback laser

作　　者：熊燕玲[1,2] 任乃奎 梁欢[2] 李乔艺 吴明泽[2] 杨月[2] 

机构地区：[1]哈尔滨理工大学工程电介质及应用技术教育部重点实验室,哈尔滨150080 [2]哈尔滨理工大学应用科学学院,哈尔滨150080

出　　处：《强激光与粒子束》2015年第1期29-32,共4页High Power Laser and Particle Beams

基　　金：黑龙江省教育厅科研项目(12541163)

摘　　要：通过对该系统采集到的法布里-珀罗（F-P）标准具透射谱和光纤布拉格光栅（FBG）传感器反射谱进行寻峰算法以及拟合算法的研究,采用C语言编程和LabVIEW编程相结合的方式,实现了FBG波长信号的解调。其中,由于系统采集到的F-P透射谱和FBG反射谱线时域信号数据都由离散点构成,且在3dB带宽内均符合高斯曲线分布,采用高斯拟合对采集到的信号数据进行寻峰处理,提高系统精度;又由于分布式反馈（DFB）激光器的波长扫描存在着一定的非线性,采用二项式拟合对DFB激光器的波长扫描曲线进行拟合,以降低其非线性导致的误差。另外,设置一路标准FBG传感通道用于波长校准。实验研究表明该系统稳定性良好,波长测量范围为1 550.012~1 554.812nm,分辨力为1pm,精度为±10pm,验证了该系统可用于FBG波长信号检测的可行性。Through the study of the demodulation algorithm including the searching peak algorithm and fitting algorithm on the collected data（the domain signals of the Fabry-Perot（F-P）etalon transmission spectrum and fiber Bragg grating（FBG）sensors reflection spectrum）by the system,the FBG wavelength signal demodulation is achieved by way of combining C language programming with LabVIEW.As the collected data points consisted of the time-domain signals of F-P etalon transmission spectrum and FBG reflection spectrum by the system are discrete,and within 3dB bandwidth the time-domain signal spectra of F-P etalon and FBG are in line with a Gaussian curve distribution,the Gaussian fitting is used for the collected data points to find the time point corresponding to the signal peak to improve system precision;Also,because of the certain nonlinearity of the distributed feedback laser（DFB）laser scanning wavelength with the scanning time,the binomial curve fitting is used to reduce the error caused by the nonlinearity.In addition,a standard FBG sensing channel is set for wavelength calibration.Experimental studies show that the system has a good stability,the wavelength measurement range is 1 550.012-1 554.812 nm,the resolution is 1pm,the precision is±10pm,verifying the feasibility of the system applying to the FBG wavelength signal detection.

关 键 词：分布式反馈激光器 光纤布拉格光栅 传感器 法布里-珀罗标准具 波长解调 

分 类 号：TP212.24[自动化与计算机技术—检测技术与自动化装置]