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面向宽带接人与泛在感知应用的基于双波长的线性化光载无线链路(英文).docx

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面向宽带接人与泛在感知应用的基于双波长的线性化光载无线链路(英文) Introduction Withtherapiddevelopmentofbroadbandaccessandubiquitoussensingapplications,thereisaneedforahighlyefficientwirelesscommunicationsystemthatcanwithstandthechallengesofhigh-speeddatatransmissionandsignalattenuation.Opticalwirelesscommunication(OWC)isapromisingsolutiontoaddressthesechallenges,whichexploitstheelectromagneticwavescarriedbylighttotransmitinformationwirelessly.However,duetoatmosphericturbulenceandsignalinterferencefromlightsources,OWCissubjecttofluctuationsinthereceivedsignalpowerandlossofcoherence,resultinginpoorcommunicationqualityandlowdatarates.Toovercomethesechallenges,alinearizeddual-wavelengthOWClinkisproposedinthispaper. Background TraditionalOWCsystemsemployasinglewavelengthforsignaltransmission,whichleadstoahighsensitivitytoatmosphericturbulenceandhardwareimperfection,causingsignalfadingandoutages.ToenhancethestabilityandreliabilityoftheOWClink,dual-wavelengthsystemshavebeendeveloped.Inparticular,theproposedsystemcombinestwospectrallynarrowwavelengthsforcarriersignaltransmission,andaphotodetectorandamixerareusedtoconverttheopticalsignalintoanelectricsignal.Bysubtractingthetworeceivedsignalsgeneratedbythephotodetector,linearizationcanbeachieved. PrincipleofDual-WavelengthLinearization Theprincipleofdual-wavelengthlinearizationisbasedontheinterferencebetweenthetwolightwavesgeneratedbytwolightsourceswithdifferentspectralwidthsandwavelengths.Thetwolightwavesaresuperimposedintheatmosphericchannelandinteractwiththeatmosphericturbulencesandhardwareimperfectionsdifferently,whichleadstothedifferenceofthereceivedsignals.Bysubtractingthetwosignalsgeneratedbythephotodetectorandapplyingacompensationalgorithm,linearizationisachieved. SystemDesign Theproposedsystemisdesignedbasedontheprincipleofdual-wavelengthlinearizationandincludesatransmitter,areceiver,andacommunicationchannel.Thetransmitteremploystwolaserdiodeswithdifferentwavelengths(λ1andλ2)andspectralwidths.Themodulatedsignalistransmittedthroughafree-spacechanne