光纖布拉格光柵重構(gòu)算法的研究.pdf

1、江南大學(xué)碩士學(xué)位論文光纖布拉格光柵重構(gòu)算法的研究姓名：高志鵬申請學(xué)位級別：碩士專業(yè)：檢測技術(shù)與自動化裝置指導(dǎo)教師：余震虹20070301ABSTRACI“Inrecentyears，duetotheimprovementinopticaldetectiontechnologyandfiberopticalcommunication，fiberBragggrating(FBG)becomesakeycomponentinopticalme

2、trologysystemandopticalcommunicationsystemConsequentlythereconstructionoffiberBragggratingsbecomesaresearchingfocusFirstlythecoupled—modeequationsanditsanalyticsolutionarederivedfromtheexpatiationofcoupledmodetheoryThree

3、numericmethodsforsolvingcoupledmodeequationsareelucidated，includingtwotraditionalmethodsandamicrowavemodelmethodInthefollowing，asetofalgorithmsforFBGreconstructionalediscussed，includingthreeinversescmtefingalgorithms(Fou

4、riertransformalgorithm，GLMalgorithm，layerpeelingalgorithm)andtwooptimizationalgorithms(geneticalgorithmandsimulatedannealingalgorithm)BoththetheorybasesofthesealgorithmsandtheirschemesareemphasizedWhat’smorg，numericalexa

5、mplesalegiventoillustratethetraitsandthedifferentperformancesofthealgorithmsLayerPeeling(LP)algorithmismostwidelyusedowingtoitshi曲efficiencyandperformanceHoweveLit’sbasedonthediscretegratingmodelwhichneglectsthemultipler

6、eflectionsbetweeninsidereflectorsFouriertransformineachstepoftherecursivecalculationalsopullsitsprecisiondownwhichleadstothenumericalan—stabilityinthereconstructionofstronglyreflectinggratingsMoreoverthereconstructedresu

7、ltformultichannelgratingrequiresaveryhighrefractiveindexmodulationwhichmaybetoohi曲tofabricatesuchgratingInthispaper，afulltime—domainLPalgorithmisproposedIt’sbasedonthetransmissionrelationsintimedomainwithoutusingFouriert

8、ransformandtakesthemultiplereflectionsintoaccountTheseadvantagesensureitshighefficiencyandperformanceforreconstructingstronggratingsInthefollowingtwohybridalgorithmsareproposedforreconstructingsinglechannelstronglyreflec

9、tingFBGandmultichannelFBGrespectivelyThetwohybridalgorithmsarebothbasedonthecombinationofLPalgorithmandgeneticalgorithmInthereconstructionofsinglechannelstronglyreflectingFBGthesampledresultofLPalgorithmisusedasinitialpo

10、pulationforgeneticalgorithm(GA)whichiscarriedoutforoptimizingthecouplecoefficientsintherearsectionsofFBGInthereconstructionofmultichannelFBGaseriesofphasefactorsareoptimizedbyGA，thenthesephasefactorsareintroducedintothes

11、pectralresponseofeachchannelfromwhichthegratingisreconstructedbyLPalgorithmThefulltimedomainLPalgorithmandthetwohybridalgorithmscompletelysolvedthetwoproblemswhichthetraditionalLPalgorithmhasencounteredItwillbeofgreatpra