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摘要: 为对激光干涉测速系统(VISAR)中信号光纤的色散特性进行快速测量,搭建了一种基于时域法的 多模光纤色散测量装置。该装置由532nm 的皮秒激光器、快响应光电探测器以及宽带数字示波器组成,通 过对输入光纤前后的光脉冲时间宽度进行测量,来获得光纤的脉冲响应3dB脉宽(即色散时间)。利用该装 置分别对一根长度为123m 的国产梯度折射率光纤以及一根10m 长的阶跃折射率光纤在532nm 波长附近 的色散特性进行了测量。测得的梯度折射率光纤色散时间为(68316)ps,对应3dB频响带宽为646MHz; 阶跃折射率光纤色散时间为(163114)ps,对应频响带宽为271MHz。对实验结果进行了测量不确定度分 析,并与理论计算值进行了比较,获得了较好的一致性。研究表明,利用该实验装置,可对激光干涉测速应用 中信号光纤的色散特性进行迅速、准确的测量,从而为实验中信号光纤类型、长度等的合理选用提供参考。Abstract: TomeasurethedispersionofthesignalopticalfibersinVISAR,asetupwasbuiltbasedon thetimedomainmethod.Thesetupismadeupofapicosecondlaser,afast-responsephotodetector andabroadbanddigitaloscilloscope,whichcanaffordthe3dBdurationoftheimpulseresponsefunctionbymeasuringtheopticalpulsedurationsinandoutthemeasuredfiber. Thissetupwasusedto characterizethedispersionpropertiesofa123-m-lengthgradientindexfiberanda10-m-lengthstepindexfiberatabout532nm, respectively.Theobtaineddispersiontimeofthegradientindexfiberis (68316)psandthecorrespondingfrequencyresponse3dBbandwidthisabout646MHz.Theseof thestepindexfiberare(163114)psand271MHz,respectively.Uncertaintyanalysisofthemeasuredresultswasperformed, andthemeasuredresultswerecomparedwiththetheoreticalcalculations. Itdisplaysthatthemeasuredresultsareconsistentwiththetheoreticalcalculations.Thebuilt setupcanaffordasimpleanddependabledispersiontimemeasurementforthesignalopticalfibersin VISARapplications,therebyitcanprovidereferenceforreasonablychoosingthetypeandlengthof thesignalopticalfibersinexperiments.
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Key words:
- mechanicsofexplosion /
- dispersionmeasurement /
- timedomainmethod /
- multimodefiber
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