Lub Wavelength Division Multiplexing (WDM) system yog ib qho kev daws teeb meem, kho qhov muag kom nce qhov yooj thiab muaj peev xwm ntawm cov kab fiber ntau uas twb muaj lawm hauv kev sib txuas ceev. Los ntawm kev ntxiv ntau txoj hauv kev rau cov fibers muaj, WDM System ua kom muaj kev sib tw ntau dua rau cov ntaub ntawv sib txuas lus hauv lub nplhaib, taw tes rau-taw tes, thiab ntau lub ntsiab lus topologies rau kev lag luam thiab kev siv metro. Koj puas paub txog WDM system? 5 lub tswv yim muab hauv blog no tuaj yeem pab koj tau yooj yim.
Optical Transmission
Optical kis tau tus mob yog hloov dua siab tshiab ntawm cov kwj ntawm cov ntaub ntawv mus rau lub teeb pulses. Lub teeb pulses yog tsim los ntawm ib qho chaw laser (LED lossis lub nkoj) thiab kis tau los ntawm fiber ntau optical. Lub receiver hloov lub teeb pulses rov qab rau cov ntaub ntawv digital.
Wavelength Division Multiplexing
WDM yog raws li qhov tseeb tias fibers optical muaj peev xwm nqa tau ntau tshaj ib lub wavelength tib lub sijhawm. Cov lasers yog kis lub teeb pulses ntawm qhov sib txawv wavelengths uas tau ua ke ntawm cov ntxaij lim dej rau ib qho kev tso zis fiber ntau. Cov cuab yeej siv los ua ke cov wavelengths hu ua multiplexer thiab cov cuab yeej siv los cais cov wavelengths hu ua demultiplexer, uas yog ob qho tseem ceeb tshaj plaws hauv WDM system.
Optical Amplifiers
Optical amplifier yog ib qho cuab yeej uas ua kom lub teeb liab kho qhov muag ncaj qha, tsis tas yuav tsum xub hloov nws mus rau lub teeb liab hluav taws xob. Optical amplifiers boosts lub attenuated wavelengths thiab yog tus nqi ntau dua li cov hluav taws xob repeaters. Yog tsis muaj amplifiers qhov ncav cuag yog txwv rau 80-100km ua ntej hluav taws xob regeneration. Amplifier chaw nres tsheb feem ntau txhua 80-100km.
Nyob ntawm hom teeb liab thiab cov yam ntxwv ntawm fiber ntau, amplifiers yog siv hauv DWDM tes hauj lwm thiab ua rau kom ncav cuag cov teeb liab kho qhov muag mus txog 3000 km. Amplifiers yog ib qho yooj yim tsev thaiv rau lub zog DWDM network.
Transponder
Transponders muab kev hloov pauv wavelength los ntawm tus neeg siv khoom mus rau WDM teeb liab. Lub transponder maps ib tus neeg siv khoom rau ib qho WDM wavelength. Lub digital framing ntawm kab teeb liab los ntawm lub transponder muab kev pabcuam saib xyuas, kev tswj xyuas kev sib txuas thiab nce mus txog. Qhov dav ntawm cov transponders muaj peev xwm ua kom muaj txiaj ntsig zoo rau ob qho tib si CWDM & DWDM.
Optical Add Drop Multiplexer
Lub luag haujlwm tseem ceeb ntawm optical multiplexer yog ob lossis ntau lub wavelengths rau hauv tib lub fiber ntau. Yog tias lub demultiplexer muab tso rau thiab ua kom zoo rov qab-rau-rov qab nrog lub multiplexer, nws yog qhov tseeb tias nyob rau hauv cheeb tsam ntawm lawv, muaj ob tus neeg wavelengths. Qhov no nthuav tawm lub sijhawm rau kev txhim kho kev ua haujlwm, ib qho uas ib tus neeg wavelengths tuaj yeem raug tshem tawm thiab muab tso rau. Cov haujlwm zoo li no yuav raug hu ua Optical Add Drop Multiplexer (OADM). OADM yog siv los ua kom yooj yim rau hauv txoj kev kho qhov muag. Cov kev pabcuam tuaj yeem raug xa rov qab raws li qhov tsis ua haujlwm lossis muaj peev xwm txwv tsis pub muaj peev xwm thiab muaj peev xwm tuaj yeem nce dynamically ib ntawm.
Xaus
Multiplexer thiab demultiplexer yog qhov tseem ceeb tshaj plaws hauv WDM system. Yog tias koj kis tau tus mob ntau dua 100 km, yuav tsum muaj lub tshuab hluav taws xob kho qhov muag. Yog tias koj tus neeg siv wavelength tsis muaj rau WDM daim ntawv thov, koj yuav xav tau lub transponder los hloov nws mus rau WDM muaj wavelength. Xav kom ua tiav qhov hloov pauv tau yooj yim, tsuas yog xaiv siv OADM. Dhau li ntawm cov no, qee zaum, ib qho kev them nyiaj dispersion kuj tseem xav tau los kho daim ntawv ntawm cov teeb liab kho qhov muag uas yog deformed los ntawm chromatic dispersion thiab them nyiaj rau chromatic dispersion hauv fiber ntau uas ua rau lub teeb pulses kis tau thiab tsim teeb meem tsis zoo. Koj puas tau txais WDM system? Cia li pib tsim koj tus kheej WDM system tam sim no!
