特殊涡旋光束在湍流大气中传输的轨道角动量模式特性研究.pdf

(FSOC,Free-SpaceOpticalCommunication)

(OAM,OrbitalAngularMomentum)

OAM

/

OAM

OAMOAM

OAM-

RytovFSOC

(POVBs,Pin-likeOpticalVortexBeams)

OAMOAM

(1)VanKamenPOVBsOAM

OAM

OAM饊亝

戆?OAM肀OAM

肀

POVBs

OAM

OAMFSOC

(2)Tatarskii

OAMOAM

OAM

OAM

OAM

I

肀=3饊亙肀橗3

饊亖饊寑OAM

FSOC

II

Abstract

Abstract

Withthecontinuousimprovementofinformationtechnologytoolsinrecentyears,the

demandfordataandinformationisincreasingrapidly.Freespaceopticalcommunication

(FSOC)useslaserasthecommunicationcarrierandhasalargerbandwidthwirelesscom-

municationlink,soithasabroadapplicationprospectininterplanetarycommunicationand

satellite-basedcommunication,etc.However,whenthelightwavetransmitsinformationin

theturbulentatmosphere,therefractiveindexofanypointinthespaceisarandomvari-

able,andtherandomfluctuationofrefractiveindexwillleadtotheeffectsoflightintensity

fluctuation,beamexpansion,beamdriftandphasefluctuation.

OrbitalAngularMomentum(OAM)hasthecharacteristicsofmutualorthogonalityand

infinitevalue,whichcanforminfinitedimensionalHilbertspace.Therefore,beamscarrying

OAMhavebeenusedformultiplexing/demultiplexinginfree-spaceopticalcommunicationto

improvechannelcapacityandspectralefficiency.However,whenvortexbeamprop