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AbsorptionThelossoflightasitpassesthrougha material,generallyduetoitsconversion tootherenergyforms(typicallyheat). AbsorptioncoefficientAnindicatorofamaterial'sinternal absorptance.Iftheunittransmissionof thematerialist,theabsorption coefficient(a)is:a=-loget AcceptanceAngleTheangleoverwhichthecoreofan opticalfiberacceptsincominglight; usuallymeasuredfromthefiberaxis. Relatedtonumericalaperture(NA). ACWDMadvancedcustomWDM. AdhesiveAnintermolecularsubstancethatserves toholdmaterialstogether.Twotypesare usedintheopticalindustry:one,which mustbetransparentandcolorless,to cementlensestogether;anda general-purposeadhesiveforbonding prismsandotherglasspartstotheir metallicsupports ADMadd/dropmultiplexer(capitalizeonly whenindicatingaproductname). AdapterAdeviceforconnectingtwoparts(asof differentdiameters)ofanapparatus;an attachmentforadaptingdevicesforuses notoriginallyintended. AH-DielectricCableCablemadeentirelyofdielectric (insulating)materialswithoutanymetal conductors,armor,orstrength members. AMamplitudemodulation.Amodulationschemeinwhichthe amplitudeofacarrierwaveischanged byinformationsignals. AnalogAsignalthatvariescontinuously(e.g., soundwaves).Analogsignalshave frequencyandbandwidthmeasuredin hertz. AngleofincidenceTheangleformedbetweenarayoflight strikingasurfaceandthenormaltothat surfaceatthepointofincidence AngleofreflectionTheangleformedbetweenthenormalto asurfaceandthereflectedray.This angleliesinacommonplanewiththe angleofincidenceandisequaltoit. AngleofrefractionTheangleformedbetweenarefracted rayandthenormaltothesurface.This angleliesinacommonplanewiththe angleofincidence. Angstrom(?Aunitoflength,0.1nmor10-10m,often usedtomeasurewavelengthbutnot partoftheSlsystemofunits.Often writtenAngstrombecausethespecial symbolisnotavailable. APCangledphysicalcontact APDavalanchephotodiode.Adevicethatusesavalanche multiplicationofphotocurrentvia hole-electronscreatedbyabsorbed photons.Whenthereverse-biasvoltage ofadevicenearsbreakdownlevel,the hole-e