DOI:10.16136/j.joel.2023.02.0192基于可调谐激光器的光纤光栅高速解调的时延误差补偿方法唐才杰1,2*,王学锋1,2,卞贺明1,2,王甫1,2,阚宝玺1,2,杨飒3(1.北京航天控制仪器研究所,北京100854;2.北京光纤传感系统工程技术研究中心,北京100094;3.西安航天动力研究所,陕西西安710100)摘要:基于可调谐激光器的光纤光栅(fiberBragggrating,FBG)解调仪用于FBG传感器的远距离、高速测量时,光传输时延会导致显著的波长解调误差。本文设计了一种补偿光传输时延导致的FBG解调误差的方法,可调谐激光器在工作光频率范围内进行高线性度的正向、反向扫描,利用正向、反向扫描过程中的光电探测信号的FBG反射峰差异,对光传输时延导致的波长解调误差进行补偿。试验结果表明,在50kHz解调频率和100m连接光纤长度条件下,将光传输时延导致的波长解调误差由2nm降低到小于10pm。关键词:可调谐激光器;光纤光栅(FBG);波长解调;误差补偿;光传输时延中图分类号:O433.1文献标识码:A文章编号:1005-0086(2023)02-0174-06OpticaldelayerrorcompensationmethodforFBGhigh-speedin-terrogatorbasedontunablelaserTANGCaijie1,2*,WANGXuefeng1,2*,BIANHeming1,2,WANGFu1,2,KANBaoxi1,2,YANGSa3(1.BeijingInstituteofAerospaceControlDevices,Beijing100854,China;2.BeijingEngineeringResearchCenterofOpticalFiberSensingSystem,Beijing100094,China;3.Xi'anAerospacePropulsionInstitute,Xi'an,Shaanxi710100,China)Abstract:OpticaltransmissiondelaycouldinducesignificantwavelengthdemodulationerrortothefiberBragggrating(FBG)interrogatorsbasedontunablelaser,especiallywhentheyareappliedforremoteandhigh-speedmeasurementofFBGsensors.AmethodforcompensatingthewavelengthdemodulationerrorofFBGinducedbyopticaltransmissiondelayisproposed.Theopticalfrequencyoftunablelaserscansinupanddowntwodirectionswithhighlinearityinitsspectrumrange.Thewavelengthdemodula-tionerroriscompensatedbythedetectedFBGreflectionpeakdifferencebetweenupanddown-scanspectrums.Experimentalresultsshowthat,thewavelengthdemodulationerrorinducedbyopticaltrans-missiondelaycanbereducedfrom2nmtolessthan10pmaftercompensation,withmeasurementfre-quencyof50kHzandopticalfiberlengthof100m.Keywords:tunablelaser;fiberBragggrating(FBG);wavelengthdemodulation;errorcomp...
