CWDM thiab DWDM sawv cev rau ob qhov sib txawv wavelength- faib multiplexing mus kom ze raws li tus qauv ITU, txhua tus haum rau qhov sib txawv network. CWDM, txhais raws li ITU-T G.694.2, ua haujlwm dav dav 20nm channel sib nrug thoob plaws 1270–1610nm wavelength ntau yam, haum rau 18 channels. Qhov no ua rau nws zoo haum rau metro thiab nkag mus rau kev sib txuas uas qhov kev sib kis feem ntau nyob qis dua 80km. DWDM, tswj hwm los ntawm ITU-T G.694.1, ua haujlwm hauv thawjDWDM bands- C-band thiab L-band (1525–1610nm) - thiab siv ntau qhov sib nrug ntawm 0.8nm lossis 0.4nm, sib xws rau 100GHz thiab 50GHz ntawmITU-T daim phiajraws. Nrog lub peev xwm los multiplex tshaj 80 wavelength channels mus rau ib qho fiber ntau, DWDM yog qhov tseem ceeb tshaj plaws rau kev thauj mus los ntev -haul, siab - muaj peev xwm rov qab thauj cov tshuab.
Ob lub thev naus laus zis daws tib yam teeb meem tseem ceeb - tau txais cov ntaub ntawv ntau ntxiv los ntawm cov khoom siv fiber ntau uas twb muaj lawm - tab sis lawv ua lag luam sib txawv heev - tawm ntawm tus nqi, peev xwm, thiab ncav cuag. Phau ntawv qhia no taug kev los ntawm qhov sib txawv thiab pab koj txiav txim siab seb lub tshuab twg haum rau koj lub network.
CWDM Technology yog dab tsi?
Nrog 18 channels thiab awavelength sib nrugntawm 20nm, CWDM qhov dav channel qhov sib txawv txhais tau hais tias nws cov transceivers tuaj yeem siv cov lasers uas tsis muaj cua sov uas ua rau lub wavelength drift los ntawm qhov kub thiab txias. Qhov no ua rau CWDM modules yooj yim dua, pheej yig dua, thiab qis dua hauv kev siv hluav taws xob piv rau lawv cov DWDM counterparts.
CWDM txhawb cov ntaub ntawv tus nqi mus txog 10G ib channel nyob rau hauv feem ntau cov tswv yim deployments thiab muaj peev xwm mus txog deb ntawm kwv yees li 80km yam tsis muaj kho qhov muag amplification. Txawm li cas los xij, CWDM tsis tuaj yeem siv EDFA amplifiers kom ntev tshaj qhov ntau ntawm no - nws cov channel nthuav dav dav dav rau ib qho amplifier los npog.
DWDM Technology yog dab tsi?
DWDM's channel qhov sib nrug ntawm 0.8nm lossis 0.4nm xav tau cov lasers txias nrog kev tswj xyuas qhov kub thiab txias kom txhua lub wavelength ruaj khov thiab tiv thaiv teeb liab cuam tshuam ntawm cov kab uas nyob ib sab. Qhov no yog thawj qhov laj thawj DWDM transceivers raug nqi ntau dua thiab siv zog ntau dua li CWDM modules.
Qhov sib nrug nqaim no nyob rau hauv C-band tsis yog arbitrary. C-band zaum ntawm qhov chaw qis tshaj plaws nyob rau hauv silica fiber ntau, thiab nws kuj yog qhov tseeb qhov rais ntawm EDFA (Erbium-Doped Fiber Amplifier) technology. Qhov no txhais tau tiasDWDM wavelengthstuaj yeem nthuav dav thiab xa mus hla ntau txhiab mais - ib yam dab tsi CWDM hauv paus ua tsis tau. DWDM kuj tseem txhawb nqa ntau dua rau -channel tus nqi, suav nrog 100G, 400G, thiab dhau ntawm kev siv thev naus laus zis sib koom ua ke.
Kev sib piv wavelength
Txoj kev intuitive tshaj plaws kom nkag siab qhov txawv yog saib qhov twgITU channelsrau CWDM thiab DWDM zaum ntawm qhov muag pom. Qhov 18CWDM wavelengthsyog kis thoob plaws 340nm ntau yam. Tshaj 80DWDM channelstau ntim rau hauv ib lub qhov rais 37nm hauv C-band. Qhov tseeb, tag nrho DWDM channel daim phiaj nyob hauv qhov chaw sib npaug li ntawm ob CWDM channel - cov uas nyob ze ntawm 1530nm thiab 1550nm.
DWDM tuaj yeem nqa cov ntaub ntawv ntau dua vim tias nws siv cov spectrum zoo dua, haum rau ntau qhov chaw uas CWDM haum rau ob.
Yog vim li cas CWDM Poob Channels dhau deb
Standard ib leeg- hom fiber ntau muaj thaj tsam ntawm cov teeb liab siab poob ntawm kwv yees li 1370nm thiab 1430nm, tshwm sim los ntawm cov dej ions seem (OH⁻) hauv iav. Hauv cheeb tsam no, attenuation tuaj yeem ncav cuag 1.0 dB / km - kwv yees li plaub npaug siab dua li qhov qub 0.25 dB / km pom lwm qhov hauv spectrum. Qhov no yog lub npe hu ua lub ncov dej.
Rau luv luv txuas hauv qab 40km, qhov poob ntxiv hauv cheeb tsam no yog tswj tau thiab tag nrho 18CWDM channelsnyob twj ywm siv tau. Tab sis raws li kev ncua deb dhau 40km, plaub mus rau tsib txoj kab uas ntog hauv thaj tsam dej siab dhau los ua qhov tsis zoo los tuav lub teeb liab txhim khu kev qha. Qhov no ua tau zoo txo CWDM lub peev xwm siv tau los ntawm 18 channel mus rau kwv yees li 8 txog 10 ntawm kev ncua ntev.
DWDM zam qhov teeb meem no tag nrho vim hais tias tag nrho nws cov channel yog concentrated nyob rau hauv C-band, uas zaum nyob rau hauv qis tshaj - poob cheeb tsam ntawm lub fiber spectrum. Niaj hnub nimno qis dej ncov fiber ntau (G.652.D) txo cov nyhuv dej siab, tab sis nws tsis daws CWDM lwm yam kev txwv: qhov tsis muaj peev xwm ua kom nrov.
CWDM vs DWDM: Qhov txawv tseem ceeb
| Yam | CWDM | DWDM |
|---|---|---|
| Cov channel | 18 (8-10 ntawm kev ncua ntev) | 40–96+ |
| Channel sib nrug | 20nm ua | 0.8nm (100GHz) / 0.4nm (50GHz) |
| Wavelength ntau | 1270–1610 nm | C-band: 1528–1565nm |
| Max ncav tsis cuag amplification | ~ 80km | ~ 80-120km |
| Max ncav cuag nrog amplification | Tsis txhawb | Ntau txhiab km (EDFA) |
| Tswv yim rau -channel tus nqi | Mus txog 10G | 100G, 400G, thiab siab dua |
| Laser hom | Uncooled DFB | Txias DFB / EML / Tunable |
| Relative transceiver nqi (10G) | Lower (lub hauv paus) | ~ 1.2–1.8x siab |
| Kev ua haujlwm nyuaj | Tsawg heev (passive, ntsaws-thiab-play) | Tsawg (passive) mus rau nruab nrab (ua haujlwm nrog amplifiers) |
Dimi Cov Lus Qhia
Lub peev xwm sib txawv tsis yog nce ntxiv - nws yog exponential.CWDM lub theoretical siab tshaj plaws yog nyob ib ncig ntawm 18 raws ntawm 10G txhua, tag nrho 180Gbps. DWDM ntawm 80 raws ntawm 100G xa 8Tbps ntawm ib qho fiber ntau - thiab nrog 400G coherent optics, ntau dua.
Tus nqi yog ntau tshaj tus nqi transceiver.CWDM transceivers raug nqi tsawg dua ib chav. Tab sis tag nrho cov nqi network nyob ntawm ntau npaum li cas fibers koj xav tau. Ob qho WDM thev naus laus zis txo cov suav fiber ntau, tab sis DWDM txo nws qhov hnyav dua. Thaum cov fibers tsaus yog xauj es tsis yog tus tswv, lossis thaum txoj kev siv fiber ntau yog congested, DWDM tus nqi siab dua rau -module tus nqi yuav ntau dua li offset los ntawm kev txuag fiber ntau. Cov kev xav ib txwm hais tias CWDM ib txwm pheej yig dua muaj tseeb tsuas yog thaum suav cov channel tsis tshua muaj thiab fiber ntau tau yooj yim.
Passive DWDM tsis yog qhov nyuaj.Nyob rau hauv qhov tseeb, passive DWDM systems - uas npog feem ntau ntawm cov lag luam thiab metro deployments nyob rau hauv 80km - ua hauj lwm zoo tib yam rau CWDM: ib khub ntawm MUX/DEMUX units, txheem transceivers, thiab tsis muaj active Cheebtsam nyob rau hauv txoj kev kho qhov muag. Lub nra hnyav ua haujlwm tsuas yog tshwm sim thaum koj ntxiv amplifiers thiab cov kab ke ua haujlwm ntev -haul kis tau tus mob.
Koj Yuav Tsum Siv CWDM lossis DWDM?
Thaum twg los xaiv CWDM
CWDM ua haujlwm tau zoo thaum koj qhov kev sib kis deb tsawg dua 40km, koj cov channel yuav tsum yog yim lossis tsawg dua, thiab koj li -channel bandwidth nyob ntawm 10G lossis qis dua. Cov xwm txheej siv xws li kev lag luam hauv tsev kawm ntawv kev sib txuas ntawm cov tsev, qhov chaw cia me me txuas ntxiv, thiab cov kev siv metro nkag tau nrog cov kev xav tau nruab nrab. Yog tias koj twb muaj CWDM xa tawm nrog cov channel rau seem, tsis tas yuav tsiv teb tsaws.
Thaum twg los xaiv DWDM
Xaiv DWDM thaum koj qhov kev sib txuas deb tshaj 80km, thaum koj xav tau ntau tshaj kaum txoj kev ywj pheej, thaum twg qhov txuas yuav tsum muaj 100G lossis siab dua, lossis thaum koj tab tom tsim lub network tshiab uas xav tau ntau dua li tsib mus rau kaum xyoo qab ntug. Cov ntaub ntawv chaw sib cuam tshuam ntawm 100G lossis 400G nrawm, metro tub ntxhais lub nplhaib sib txuas, thiab txhua qhov xwm txheej xav tau kev nthuav dav kho qhov muag txhua qhov taw qhia rau DWDM yam tsis muaj qhov tsis meej.
Hybrid deployment ntawm ob
Yog tias koj muaj qhov CWDM uas twb muaj lawm uas tab tom khiav tawm ntawm cov channel tab sis koj tsis tau npaj txhij rau tag nrho DWDM tsiv teb tsaws, txoj hauv kev hybrid tuaj yeem ua tus choj. Los ntawm repurposing lub 1530nm thiab 1550nm CWDM channel qhov rais, koj muaj peev xwm overlay mus txog 13 DWDM raws nyob rau hauv txhua txhua 20nm qhov rais siv 100GHz spacing - ntxiv mus txog 26 tshiab raws thaum ua kom koj cov kev pab cuam CWDM uas twb muaj lawm.
Txawm li cas los xij, muaj kev txwv. EDFA amplification tsis tuaj yeem siv rau ntawm qhov sib txuas sib txuas vim tias nws yuav cuam tshuam nrog CWDM channels nyob ib puag ncig. Lub DWDM overlay channels raug txwv kom ncav cuag passive, thiab kev npaj wavelength yuav nyuaj dua.
FAQ
Q: Kuv puas tuaj yeem hloov kho los ntawm CWDM rau DWDM yam tsis tau hloov cov fiber ntau?
A: Yog. Ob leeg CWDM thiab DWDM ua haujlwm dhau tus qauv G.652 ib leeg- hom fiber ntau. Lub fiber nws tus kheej tsis tas yuav hloov pauv - tsuas yog MUX/DEMUX units thiab transceivers hloov. Qhov no yog ib qho laj thawj ntawm kev tsiv teb tsaws ntawm CWDM mus rau DWDM yog qhov ua tau.
Q: Puas CWDM thiab DWDM transceivers ua haujlwm hauv tib lub keyboards thiab routers?
A: Feem ntau, yog. Ob qho CWDM thiab DWDM transceivers muaj nyob rau hauv cov qauv qauv xws li SFP, SFP +, SFP28, thiab QSFP28. Ntev npaum li koj qhov hloov pauv lossis router muaj cov chaw nres nkoj sib xws thiab txhawb nqa cov ntaub ntawv tus nqi, nws tsis muaj teeb meem txawm tias lub transceiver siv CWDM lossis DWDM wavelength - tus tswv cuab yeej pom qhov qub Ethernet lossis Fiber Channel txuas.
Q: Dab tsi yog qhov tunable DWDM transceiver thiab thaum twg kuv yuav tsum xav txog ib qho?
A: Lub transceiver DWDM tunable tuaj yeem teeb tsa los ua haujlwm ntawm ib qho channel hla C-band, tsis yog kho rau ib lub wavelength ntawm lub Hoobkas. Qhov no ua kom yooj yim rau kev tswj hwm cov khoom seem - es tsis txhob khaws ib qho khoom siv thaub qab rau txhua qhov wavelength, koj tuaj yeem khaws qee qhov me me ntawm tunable units uas npog tag nrho cov channel. Tunable transceivers yog tshwj xeeb tshaj yog muaj nqis nyob rau hauv tes hauj lwm nrog ntau DWDM wavelengths los yog nyob rau hauv ib puag ncig uas txo cov lus nug complexity teeb meem.
Q: Puas yog CWDM thev naus laus zis dhau los lawm?
A: Tsis yog. Thaum DWDM tseem nyob hauv qhov siab - muaj peev xwm thiab ntev - cov xwm txheej thauj, CWDM tseem ua lub luag haujlwm tseem ceeb hauv luv luv - nrug, nqi- kev xa tawm sai. Nws tseem tab tom nrhiav qhov tseem ceeb tshiab hauv 5G fronthaul tes hauj lwm, qhov twg 25G CWDM LAN-WDM schemes tau dav siv rau kev txuas xov tooj cua mus rau cov khoom siv hauv baseband.
