Fiberplex WDM8 Manual de usuario descargar pdf (Pagina 6)

Introduction

TheFiberPlexWDMisan8or16ChannelWavelengthDivisionMultiplexer,witheachopticalchannelbroughtouttoanSFPslot,sotheuser

doesnotneedtosupplywavelength‐specificmodules.EachchannelcanbelinkedviafiberwithselectedFiberPlexFOMorFOIfibermodules,

FiberPlexLightViper™or

withvirtuallyanythirdpartyfiberoptice quipmentwithdataratesfrom155megabitsupto3gigabitsperchannel,

forapossiblemaximumaggregatedatarateof48gigabits.

TheuserdataentersandleavestheWDMvia16SFPslotsontheWDM16,or8slotsonthe

WDM8AandWDM8B,whichcanbeleft

unpopulatedforunusedchannels,orpopulatedwithuser‐suppliedMSA‐compliantSFPmodulesthatareappropriatefortheuser’sdatarate,

protocolandjitterrequirements.Internally,theseconnecttofiberoptictransceiverswhicharetunedtothespecificwavelengthsforthe

channels,whicharethenmultiplexedontotheaggregatepairwhichconnecttotheotherWDM(s)inthelink.Datathatentersaspecific

channelononeWDMwillappearonthecorrespondingchannelontheotherWDM(s)inthelink,withnointerferencewithanyother

channels.

Possiblelinkconfigurationsare:



WDM16toWDM16–all16channelsthrough



WDM8AtoWDM8A–all8channelsthrough



WDM8BtoWDM8B–all8channelsthrough

TheaggregatefibersfromtheWDMunitsexitthechassisviaaduplexLCcoupler,whichconnecttosinglemodefiber,upto20kmin

length.

Sincethisisanaggregatedwidebandstream,anyuserequipmentintheopticalpath(switches,couplers,etc.)mustbeabletoaccommodate

theentirebandwidthwithoutattenuation,andwillnotbeabletoreceiveordecodethestreamdigitally.

TheWDMunitshaveprovisionfortwo(2)powersupply

modulesforredundancyeachhavingcapacitytopowertheentireunit.AnACpower

inputmoduleisavailablenowandaDCversionisindevelopment;bothare‘hotswappable’.

KeyFeatures



16(or8)ChannelActiveWaveDivisionMultiplexer



Combines16(or8)opticalchannelsintoasinglefiberpair



Eachchannelindependentlysupportsdataratesfrom155MBupto3GB



SMPTEcompatibleinternalfiberoptics,videooptimizedtosupportPathologicalSignals



Eachopticchannel

canindependentlyacceptmultimodeorsinglemodeoptics,coaxconnection orCAT5usingflexibleSFPmodules



Fullyredundant,hotswappablepowerforultimatereliability



WDMTheoryofOperation

Infraredlighthasafrequencyofapproximately400Terahertz(400,000Gigahertz).Thatisabout125,000timeshigherthanthedatarateofa

typical3GigabitSFP,whichmeansalargeproportionofthebandwidthofafiberopticcableiswasted.Thecurrentstateoftheartdoesnot

allow

utilizingallofthatbandwidth,butwecanrecoversomeofitbyatechniquecalled“CoarseWaveDivisionMultiplexing,”or“CWDM.”

Essentially,itisthesimpletechniqueoftakingeach3Gigabitchannelandusingittomodulateadifferentfrequencyinthat400Terahertz

bandwidth.Thisisdone

throughaseriesofopticalfiltersandcombiners,alongwithlasersandphotodiodestunedtoaparticularinfrared

centerfrequency.Historically,however,opticsarereferredto,notbytheirfrequency,butbytheirwavelength,whichisthespeedoflight

dividedbythefrequency.

InthetraditionalimplementationofaCWDM,

itistheuser’sresponsibilitytoprovidethetailoredSFPsandthe CWDMitself,whichmay

requireadapterstointerfacewiththeuserequipment.

TheFiberplexWDMline,ontheotherhand,isanactiveWDM,withthewavelength‐specificcomponentsalreadytestedandconfigured.

Insteadofawavelength‐specific

opticalfiber,agenericSFPelectricalinterfaceisprovidedforeachchannel.AnySFPthatconform stothe

MSAcanbeinserted,evencopper‐basedSFPslikegigabitEthernet,SDI,HDMIorMADI.

TheinternalSFPshaveafull3Gigabitbandwidth,video‐optimized.GenericfiberSFPshavelimitationsinpassing

videosignals,sincetheydo

notmaintainaconstantDClevel.Thevideo‐optimizedSFPsareconstructedtobetterhandletheshiftingDClevelsinvideosignals.

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