光纤通信技术英文版课件.ppt

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1、PhysicsofLight:ABriefOverviewFiberOpticCommunicationTechnologylecture2基本内容：光的电磁波；射线理论和光子(ElectromagneticWaves;Beams(Rays);AStreamofthePhotons)重点、难点：掌握光的基本特性。了解光波的电磁波谱分布(electromagnetic)。重点掌握光的折射和反射定律(refractedbeamsandreflectionbeams)，了解能级之间的泵浦和辐射。(pumpingandradiate)ContentsElectromagneticwavesBeam

2、s(Rays)AStreamofPhotonsWaveopticsExperimentalbasis:InterferenceexperimentsofYoung,diffractionandinterferenceexperimentsofFresnel•Theoreticalbasis:Maxwell’sequations•Importantwavephenomenainoptics:Polarization(偏振)Interference(干涉)Diffraction(衍射)MAXWELL’SEQUATIONS∇·B=0∇·D=ρ∇×E=−∂B/∂t∇×H=J+∂D/∂tFromth

3、efirstline,thenormalcomponentsofDandBarecontinuousacrossadielectricinterfaceFromthesecondline,thetangentialcomponentsofEandHarecontinuousacrossadielectricinterfaceFig.2-2:FielddistributionsinplaneE&MwavesWavelengthisthedistancebetweentwoadjacentcreststopassyouintheperiod.Periodisthetimeittakesawav

4、e’stwoidenticalpointstopass,insequence,thesamespacelocation.Lightvelocityisequaltowavelengthdividedbyperiod.Fig.2-3:linearlypolarizedwavesFig.2-5:circularlyPolarizedlightFig.2-4:Ellipticallypolarizedlightprincipalaxis//x,α=0→δ=±π/2;±3π/2,…:α-axisofellipserelativetox:+δ:rightcircularlypolarizedThei

5、ndexofrefractionofamediumistheratioofthevelocityoflightinvacuum(c)tothephasevelocityinthemedium(v):n=c/vBeams(Rays)Incident,reflectedandrefractedbeamsφ1θ1photonsPump(甭浦)andradiation(辐射)foremission,absorption…Indicates→opticalradiationhasparticleaswellaswavepropertiesThequantumnatureoflight&basicl

6、awsthequantumnature: