CWDM vs DWDM: Yuav ua li cas xaiv yam tsis muaj nqi yuam kev

Yog tias koj tab tom sib piv CWDM vs DWDM, cov lus nug tseem ceeb feem ntau yog qhov ua tau zoo: qhov twg wavelength division multiplexing txoj kev ua rau koj lub network muaj peev xwm sib npaug, ncav cuag, scalability, thiab nqi? Ob lub thev naus laus zis xa ntau qhov teeb meem kho qhov muag hla ib qho fiber ntau, tab sis lawv ua haujlwm sib txawv ntawm cov kev xav tau ntawm lub network - thiab qhov kev xaiv yog nyob ntawm qhov tshwj xeeb xws li ncua ntev, kev cia siab rau txoj kev loj hlob, kev xav tau kev nthuav dav, thiab muaj fiber ntau suav.

Ntawm no yog ib qho kev txiav txim siab luv luv. CWDM feem ntau yog qhov zoo dua rau kev sib txuas luv dua - nrug deb (kwv yees qis dua 80 km yam tsis muaj kev nthuav dav) nrog cov channel nruab nrab suav - xav tias kev sib txuas hauv tsev kawm ntawv, kev lag luam taw tes- mus rau - taw tes khiav, lossis nkag mus - txheej txheem thauj khoom qhov yooj yim thiab qis tus nqi pib feem ntau. DWDM feem ntau yog qhov kev xaiv muaj zog dua thaum koj xav tau cov channel ntau dua, kev sib kis ntev dua, kev txhawb nqa optical amplification, lossis cov txheej txheem thauj khoom uas tuaj yeem ntsuas yam tsis muaj kev rov tsim dua tshiab - feem ntau hauv metro rings, data center interconnect (DCI), core backbone, thiab long-haul networks.
 

CWDM vs DWDM sib piv ntawm ib nrais muag

Cov lus saum toj no qhia txog kev lag luam kev lag luam dav dav-tawm: CWDM ua lag luam ceev thiab ncav cuag qhov yooj yim thiab tus nqi, thaum DWDM ua lag luam yooj yim rau lub peev xwm, nyob deb, thiab ntev - lub sij hawm yoog raws.

WDM yog dab tsi? Yuav ua li cas CWDM thiab DWDM haum rau hauv

Wavelength division multiplexing (WDM)yog lub hauv paus txheej txheem tom qab CWDM thiab DWDM. Nws ua haujlwm los ntawm kev muab cov ntaub ntawv sib txawv mus rau qhov sib txawv wavelengths (xim) ntawm lub teeb, tom qab ntawd muab lawv tso rau hauv ib qho fiber ntau optical siv lub multiplexer. Thaum kawg, ib tug demultiplexer cais cov wavelengths rov qab mus rau hauv ib tug raws. Qhov no tso cai rau ib khub fiber ntau - lossis txawm tias ib qho fiber ntau strand nrog bidirectional (BiDi) transceivers - nqa ntau lub teeb liab ywj siab ib txhij.

CWDM(Coarse Wavelength Division Multiplexing) siv dav 20 nm channel sib nrug thoob plaws lub qhov rai dav dav ntawm 1271 nm txog 1611 nm, raws li tau hais los ntawm ITU-T G.694.2. Qhov dav dav tso cai rau CWDM siv cov khoom siv laser uas tsis muaj cua sov nrog cov kev xav tau ntawm cov kev xav tau ntawm lub wavelength. Qhov ntawd yog qhov laj thawj tseem ceeb ntawm CWDM optics thiab passive mux / demux Cheebtsam raug nqi tsawg dua li lawv cov DWDM counterparts.

DWDM(Dense Wavelength Division Multiplexing) ntim cov channel ntau nruj dua - feem ntau ntawm 100 GHz (~ 0.8 nm) lossis 50 GHz (~ 0.4 nm) ncua sijhawm, anched ntawm 193.1 THz ib ITU-T G.694.1. Qhov ntim nruj no xav tau qhov kub thiab txias -stabilized lasers thiab ntau qhov kev lim dej kom pom tseeb, tab sis nws tso cai rau ntau txoj hauv kev ntawm tib lub fiber ntau. Niaj hnub nimno DWDM systems ua haujlwm hauv C-band ib leeg tuaj yeem txhawb nqa 40 channel ntawm 100 GHz qhov sib nrug lossis 80+ raws ntawm 50 GHz qhov sib nrug, nrog rau cov kab sib txuas tshiab hloov tau yooj yim txawm tias muaj kev teeb tsa denser rau coherent 400G thiab 800G wavelengths.

Qhov Tseem Ceeb Qhov Sib Txawv Ntawm CWDM thiab DWDM

Channel Spacing thiab Wavelength Grid

Qhov tseem ceeb tshaj qhov sib txawv yog li cas cov optical spectrum muab faib. CWDM's 20 nm qhov sib nrug txhais tau tias txhua qhov channel nyob ntawm lub qhov rais loj spectral, uas yooj yim rau cov khoom siv kho qhov muag tab sis txwv tag nrho cov channel suav. DWDM's sub-nanometer qhov sib nrug (0.8 nm ntawm 100 GHz, 0.4 nm ntawm 50 GHz) ua kom muaj ntau txoj hauv kev hauv qhov nqaim spectral band.

Ib qho txiaj ntsig tseem ceeb: vim tias CWDM cov channel nthuav dav dav dav (1271-1611 nm), lawv hla cov dej nqus dej siab tshaj 1383 nm. Ntawm cov laus G.652.A/B fibers, qhov no ua rau ob peb CWDM raws hauv cheeb tsam 1270–1470 nm siv tsis tau lossis nyob deb heev- txwv. Ntawm qhov qis dua tshiab - dej- cov fibers ncov raws liITU-T G.652.C/D (OS2), tag nrho 18 CWDM channel tuaj yeem siv tau. DWDM channels, concentrated nyob rau hauv C-band (1530–1565 nm) thiab qee zaum L-band (1565–1625 nm), zaum hauv thaj tsam qis-txoj kev txo qis tsis hais fiber ntau vintage.

Channel suav thiab Scalability

CWDM maxes tawm ntawm 18 channels. Hauv kev xa tawm tiag tiag, ntau lub network siv tsuas yog 8-16 ntawm cov channel vim muaj kev txwv fiber ntau lossis cov khoom siv. Qhov ntawd feem ntau txaus rau nruab nrab - muaj peev xwm txuas, tab sis nws tsim lub qab nthab nyuaj yog tias qhov kev thov bandwidth loj tuaj.

DWDM tsis muaj tib lub qab nthab. Tus qauv C-band system txhawb 40–96 raws nyob ntawm kab sib nrug. C + L band systems tuaj yeem thawb zoo tshaj 100 raws. Thaum ua ke nrog coherenttransponderskhiav 100G, 200G, los yog 400G ib lub wavelength, ib qho DWDM system tuaj yeem xa cov peev txheej ntsuas hauv kaum tawm terabits ib ob ntawm ib khub fiber ntau. Qhov kev nthuav qhia theem ntawd yog vim li cas DWDM dominates metro, nraub qaum, thiab siab -density DCI ib puag ncig.

Transmission Distance thiab Optical Amplification

Qhov no yog qhov uas qhov sib txawv ntawm kev tsim vaj tsev ntawm CWDM thiab DWDM tau tshaj tawm. Yog tsis muaj amplification, CWDM txuas feem ntau ncav cuag 40-80 km nyob ntawm qhovlink pob nyiaj siv, transceiver tso zis fais fab, thiab fiber ntau attenuation ntawm qhov tshwj xeeb CWDM wavelength siv.

DWDM tuaj yeem ncav cuag qhov tsis zoo sib xws, tab sis qhov txiaj ntsig tseem ceeb yog DWDM channels hauv C-band (1530–1565 nm) zaum square hauv qhov nce qhov rais ntawm erbium-doped fiber amplifiers (EDFAs). IbEDFAtuaj yeem ua kom muaj zog ib txhij txhua DWDM raws hauv C-band hauv ib kis, txuas mus txog ntau pua lossis ntau txhiab mais nrog inline amplifier chains. CWDM raws kis thoob plaws 1271-1611 nm poob ntau sab nraum EDFA nce qhov rais, yog li tsis muaj txoj hauv kev los nthuav qhia tag nrho CWDM multiplex optically. Qhov no ib qho tseem ceeb - amplification compatibility - feem ntau yog qhov kev txiav txim siab vim li cas engineers xaiv DWDM rau ib qho txuas uas yav tom ntej ncua deb los yog ntau -span architecture yuav zoo li.

Optics, complexity, thiab lub zog xav tau

CWDM transceivers siv uncooled faib -feedback (DFB) lasers. Tsis muaj lub tshuab cua txias (TEC), cov qauv no siv lub zog tsawg dua thiab raug nqi tsawg dua los tsim khoom. Qhov dav 20 nm channel spacing txhais tau hais tias lub laser tuaj yeem drift ob peb nanometers nrog kub hloov yam tsis tau hla mus rau hauv ib qho chaw nyob ib sab ntawm lub lim passband.

DWDM transceivers yuav tsum nruj dua wavelength tswj. Txias lossis kub - cov lasers kaw kom lub emission wavelength ruaj khov nyob rau hauv ib feem ntawm ib nanometer. Qhov no ntxiv cov nqi thiab kev siv hluav taws xob rau ib qho module. Ntawm cov channel ntau dua thiab nyob deb, DWDM tes hauj lwm kuj tseem yuav xav tau kev them nyiaj dispersion, optical channel saib, thiab wavelength - xaiv cov keyboards - cov khoom uas tsis tshwm sim hauv CWDM kev xa tawm. Txawm li cas los xij, rau kev lag luam lossis DCI daim ntawv thov siv tsuas yog ob peb DWDM wavelengths ntawm passive mux / demux, qhov nyuaj nyiaj siv ua haujlwm tuaj yeem ua me me thiab tswj tau txawm tias cov pab pawg tsis muaj xov tooj - kev paub txog kev xa khoom.

CWDM vs DWDM Tus Nqi: Ua ntej vs Ntev -Lub Sij Hawm

CWDM tus nqi qis dua rau - tus nqi transceiver thiab cov khoom siv hluav taws xob yooj yim dua ua rau nws qhov kev xaiv pheej yig dua rau kev xa tawm thawj zaug, tshwj xeeb tshaj yog nyob rau luv luv txuas nrog ib tug puv tes ntawm cov channel. Ib tug raug passive CWDM mux/demux unit ntxiv rau ib txheej ntawmCWDM SFP / SFP + transceiverstuaj yeem pheej yig dua li qhov sib npaug DWDM teeb.

Tab sis kev txheeb xyuas tus nqi yuav tsum ncua ntev tshaj hnub- ib qho kev yuav khoom. Yog tias koj lub network loj hlob xav tau 20, 40, lossis 80 channels, CWDM tsis tuaj yeem xa - koj ntsib kev rip-thiab- hloov pauv mus rau DWDM, uas txhais tau tias yuav mux/demux hardware tshiab, transceivers tshiab, thiab rov-engineering txheej optical. Hauv cov fiber ntau-tsis tshua muaj ib puag ncig uas kev xauj lossis teeb pom kev txuas ntxiv nqa tus nqi rov ua dua, DWDM lub peev xwm ntim ntau lub peev xwm ib fiber ntau tuaj yeem tsim tus nqi qis dua ntawm kev ua tswv cuab nyob rau 5-10 xyoo qab ntug. Cov nqe lus nug raug tsis yog "qhov twg transceiver pheej yig dua?" tab sis "dab tsi yog tus nqi thauj mus los ntawm -gigabit tshaj qhov xav tau lub neej ntawm qhov txuas no?"

Thaum xaiv CWDM: Cov Kev Siv Zoo Tshaj Plaws

CWDM ua rau muaj kev nkag siab zoo tshaj plaws nyob rau hauv qhov xwm txheej uas qhov kev loj hlob bandwidth tuaj yeem kwv yees tau thiab nruab nrab, kev sib txuas sib txuas nyob rau hauv qhov tsis muaj kev sib tw, thiab pab pawg muaj txiaj ntsig kev ua haujlwm yooj yim. Cov piv txwv uas muaj xws li:

• Campus backbone links.Kev sib txuas cov tsev thoob plaws hauv tsev kawm ntawv qib siab lossis chaw ua haujlwm hauv tsev kawm ntawv qhov kev ncua luv luv (feem ntau qis dua 10 km) thiab cov kev cai channel nyob qis dua 8-16 wavelengths. Ib qho passive CWDM mux/demux ntawm txhua qhov kawg nrogSFP + transceiverstuaj yeem ntxiv 10G lossis 25G raws yam tsis tau tso cov fiber ntau tshiab.
• Enterprise point-rau- taw tes kev sib txuas.Txuas lub chaw nruab nrab cov ntaub ntawv mus rau qhov chaw rov qab los ntawm kev puas tsuaj nyob ze, lossis txuas cov chaw ua haujlwm hauv tsev mus rau ib chav neeg rau zaub mov hauv nruab nrab, qhov twg tag nrho cov tsheb sib haum nyob rau hauv ob peb lub wavelengths.
• Nkag mus thiab zaum kawg - mais aggregation.Cov neeg muab kev pabcuam siv CWDM txhawm rau txhawm rau nkag mus los ntawm ntau lub PON lossis Ethernet nodes mus rau ib qho kev sib koom ua ke rov qab mus rau lub chaw ua haujlwm hauv nruab nrab, qhov kev ncua deb feem ntau nyob qis dua 40-60 km.
• Luv -nruab nrab cov ntaub ntawv chaw sib txuas.Kev sib txuas cov ntaub ntawv sib txuas lossis cov chaw nyob ib sab uas suav nrog cov channel tswj tau thiab qhov tseem ceeb yog nrawm, qis - nqi xa tawm.

Ib qho kev ceeb toom los ntawm qhov tiag -kev xa tawm thoob ntiaj teb: cov pab pawg qee zaum xaiv CWDM kom txuag nyiaj txiag ntawm kev tsim thawj zaug, tsuas yog nrhiav ob lossis peb xyoos tom qab qhov kev loj hlob tau noj tag nrho cov channel. Yog tias koj qhov kev kwv yees kev tsheb thauj mus los qhia txog txoj hauv kev xav tau ntau dua 16 wavelengths lossis yog tias qhov txuas yuav thaum kawg xav tau kev nthuav dav kom ncav cuag qhov chaw nyob deb, nws tsim nyog ua qauv DWDM lwm txoj hauv kev ua ntej ua - txawm tias nws raug nqi ntau dua nyob rau hnub ib.

Thaum xaiv DWDM: Cov Kev Siv Zoo Tshaj Plaws

DWDM yog qhov kev xaiv ua ntej rau cov tes hauj lwm uas muaj peev xwm xav tau siab, kev ncua ntev, lossis cov qauv tsim yuav tsum hloov zuj zus yam tsis muaj kev rov tsim dua. Tej yam xwm txheej muaj xws li:

• Metro nplhaib thiab kev thauj mus los tseem ceeb.Cov chaw muab kev pabcuam metro rings feem ntau nqa ntau ntau txog ntau pua lub wavelengths thoob plaws 80-200 km nrog inline EDFA amplification. DWDM nrogOTN framingyog tus qauv architecture ntawm no.
• Ntev -kev sib txuas thiab qaum.Lub teb chaws los yog thoob ntiaj teb caj qaum txuas - suav nrog submarine cables - cia siab rau DWDM nrog amplifier chains, dispersion tswj, thiab coherent transceivers nqa terabits ntau txhiab kilometers.
• Siab - muaj peev xwm cov ntaub ntawv chaw sib txuas (DCI).Huab thiab cov neeg ua haujlwm hyperscale txuas cov chaw khaws ntaub ntawv hla ib cheeb tsam metro feem ntau xav tau 40–{1}} wavelengths ntawm 100G lossis 400G txhua. DWDM ntawm maub fiber ntau, qee zaum nrog ib qho yooj yim passive mux / demux thiabQSFP-DD coherent pluggables, tau dhau los ua tus qauv DCI tseem ceeb.
• Fiber- ib puag ncig tsis tshua muaj.Thaum leasing fiber strands yog kim los yog lub cev txwv, DWDM lub peev xwm nqa tau 80+ cov kev pab cuam ntawm ib khub ua rau nws siv nyiaj txiag tshaj plaws ntawm cov nroj tsuag muaj.

Ib qho qauv tsim nyog sau cia: DWDM tau nce zuj zus tuaj hauv kev lag luam tes hauj lwm uas yog keeb kwm CWDM thaj chaw. Raws li pluggable DWDM optics (tshwj xeeb tshaj yog 100G ZR / ZR + modules) tau poob rau hauv tus nqi thiab kev xa tawm yooj yim, tus nqi sib txawv ntawm CWDM thiab DWDM rau nruab nrab cov suav suav tau nqaim. Yog tias koj lub lag luam txuas twb siv lawmtib - hom fiber ntauthiab koj cia siab tias yuav xav tau 10+ siab- cov channel ceev hauv tsib xyoos, DWDM tej zaum yuav yog qhov ntau dua rau pem hauv ntej- nrhiav kev nqis peev txawm tias zoo li "yooj yim" daim ntawv thov kev lag luam niaj hnub no.

Active vs Passive WDM: Yuav ua li cas System Architecture hloov qhov kev txiav txim

CWDM-vs-DWDM kev sib piv feem ntau tsis pom qhov axis thib ob: seb WDM system puas ua haujlwm lossis tsis ua haujlwm. Qhov kev sib txawv no tuaj yeem hloov cov peev nyiaj, qhov nyuaj, thiab muaj peev xwm ntau npaum li cov kab sib chaws wavelength nws tus kheej.

A passive WDMKev xa tawm tsuas yog siv tsis muaj zog optical mux/demux units thiab wavelength -cov transceivers tshwj xeeb ntsaws rau hauv cov keyboards lossis routers uas twb muaj lawm. Tsis muaj kev thauj mus los sib cais, tsis muaj kev tswj hwm dav hlau rau cov txheej txheem kho qhov muag, thiab tsis muaj kev nthuav dav. Ob leeg CWDM thiab DWDM tuaj yeem xa mus rau hauv hom passive. Txoj hauv kev no ua rau cov nqi qis thiab kev ua haujlwm yooj yim, tab sis nws txwv tsis pub ncav cuag lub transceiver cov peev nyiaj tsis muaj peev xwm thiab tsis muaj qhov kho qhov muag -txheej txheej saib lossis tiv thaiv kev hloov pauv.

Ibactive WDMkev xa mus ntxiv lub zog thauj platform - uas tej zaum yuav suav nrog transponders lossis muxponders, optical amplifiers, optical saib xyuas channel, thiab wavelength - tswj qib. Cov tshuab nquag muaj ntau dua nyob rau hauv DWDM kev xa tawm, tshwj xeeb tshaj yog nyob rau hauv metro scale thiab saum toj no, vim hais tias lawv ua kom muaj cov yam ntxwv zoo li optical amplification, wavelength - qib kev tiv thaiv, kev soj ntsuam kev ua tau zoo, thiab tej thaj chaw deb reconfiguration. Qee qhov niaj hnub siv DWDM platforms yog compact txaus rau cov chaw lag luam khoom siv thiab tsim los rau kev xa tawm los ntawm pab pawg tsis muaj kev sib txuas lus sib sib zog nqus.

Lub ntsiab lus tseem ceeb: ob lub network ob qho tib si sau npe "DWDM" tuaj yeem saib txawv heev. Kev teeb tsa DWDM passive nrog 8 wavelengths ntawm qhov txuas luv luv hauv tsev kawm ntawv yuav raug nqi thiab ua haujlwm zoo ib yam li CWDM xa tawm. Ib qho kev ua haujlwm DWDM platform nrog 80 channels, amplifiers, thiab OTN hloov hla lub nplhaib metro yog ib qho kev sib txawv ntawm cov txheej txheem. Thaum ntsuas cov neeg muag khoom thiab cov kev daws teeb meem, ib txwm qhia meej seb lub kaw lus hais tsis zoo lossis ua haujlwm - nws cuam tshuam rau tus nqi, kev xav tau ntawm kev ua haujlwm, thiab lub peev xwm yav tom ntej ntau dua li CWDM / DWDM daim ntawv lo ib leeg.

CWDM thiab DWDM puas tuaj yeem siv ua ke?

Yog, thiab qhov no yog ntau tshaj li ntau cov ntawv sib piv qhia. Hybrid lossis staged deployments ua rau muaj kev nkag siab zoo hauv ntau qhov xwm txheej:

• Txhim kho lub CWDM network uas twb muaj lawm.Yog tias koj twb muaj CWDM khiav ntawm ib khub fiber ntau thiab xav tau lub peev xwm ntau dua 18 txoj hauv kev tuaj yeem muab tau, koj tuaj yeem tso DWDM raws tib lub fiber ntau siv wavelength bands uas tsis cuam tshuam nrog koj cov haujlwm CWDM uas twb muaj lawm. Qee cov khoom mux / demux tau tsim tshwj xeeb rau CWDM + DWDM kev sib koom ua ke ntawm kev sib koom ua ke.
• Sib faib cov peev txheej fiber ntau los ntawm kev ua haujlwm.Qee tus neeg ua haujlwm khiav CWDM rau qis dua - qhov tseem ceeb lossis luv dua - cov kev pab cuam nyob deb thiab DWDM rau siab - muaj peev xwm rov qab tsheb khiav, txhua qhov sib cais ntawm cov fibers hauv tib lub cable.
• Phased migration.Pib nrog CWDM rau kev xav tau tam sim ntawd thiab npaj txoj kev tsiv teb tsaws chaw mus rau DWDM raws li qhov kev thov loj tuaj. Qhov no ua haujlwm zoo tshaj plaws thaum pibfiber ntau installationyog ua tiav nrog DWDM yav tom ntej hauv siab - piv txwv li, qhia qis- dej- ncov G.652.D fiber ntau.

Qhov tseem ceeb tshaj plaws kom tau txais txoj cai hauv kev sib xyaw ua ke yog kev npaj spectral: xyuas kom tseeb tias CWDM thiab DWDM channels koj npaj yuav siv tsis sib tshooj lossis cuam tshuam, thiab koj cov khoom siv passive tuaj yeem tswj hwm qhov sib xyaw wavelength uas tsis muaj kev cuam tshuam ntau dhau.

Yuav Ua Li Cas Xaiv Ntawm CWDM thiab DWDM: Ib kauj ruam -los ntawm - Kauj Ruam Kev Txiav Txim

Tsis yog kev kho qhov no yog ib zaug xwb - lossis - tsis muaj lus nug, taug kev los ntawm tsib qhov chaw kuaj xyuas no. Txhua tus tuaj yeem hloov lossis lees paub koj qhov kev taw qhia.

Kauj Ruam 1: Txiav txim siab koj qhov ncua deb thiab qhov yuav tsum tau ua kom muaj zog.
Ntsuas lossis kwv yees tag nrho cov fiber ntau nyob deb rau txhua qhov txuas. Yog tias tag nrho cov spans qis dua 60-80 km thiab koj tsis muaj qhov xav tau rau kev nthuav dav kho qhov muag, CWDM tseem siv tau. Yog tias ib qho kev ncua ntev tshaj 80 km, lossis yog tias koj xav tias yuav ntxiv cov amplifiers kom ncav cuag qhov txuas ntxiv lossis poob nyiaj rau yav tom ntej, DWDM yog qhov pib muaj kev nyab xeeb dua - CWDM channels tsis tuaj yeem nthuav dav nrog cov qauv EDFAs.

Kauj ruam 2: Kwv yees tam sim no thiab yav tom ntej channel suav.
Suav cov wavelengths koj xav tau hnub no, ces qhov project loj hlob nyob rau hauv 3-5 xyoo tom ntej. Yog tias koj xav tau qis dua 16 channel thiab kev loj hlob qeeb, CWDM tuaj yeem ua haujlwm. Yog tias koj xav tias yuav xav tau 20+ channels, lossis yog tias txhua qhov kev pabcuam tshiab lossis tus neeg xauj tsev ntxiv qhov xav tau wavelength, pib nrog DWDM. Tus nqi tsiv teb tsaws chaw los ntawm CWDM mus rau DWDM nruab nrab- lub neej voj voog yuav luag ib txwm siab dua tus nqi ntxiv ntawm kev pib nrog DWDM.

Kauj ruam 3: Ntsuas bandwidth ib wavelength.
CWDM tau zoo-muab rau 1G, 10G, thiab 25G cov kev pabcuam rau ib lub channel. DWDM txhawb tib tus nqi tab sis kuj ntsuas rau 100G, 200G, thiab 400G ib lub wavelength siv coherent optics. Yog tias koj txoj kev npaj tsheb thauj mus los suav nrog ib qho kev pabcuam ntawm 100G lossis siab dua rau ib qho channel, lossis yog tias koj xav tau sib sau ua ke ntau qhov qis dua - cov cim qhia tau zoo, DWDM nrog cov qauv transceiver tsim nyog muab lub hauv paus muaj peev xwm ntau dua.

Kauj Ruam 4: Ntsuas cov nqi fiber ntau thiab cov nqi fiber ntau.
Yog tias cov fiber ntau tsaus nti thiab pheej yig, tus nqi siab los ua kom cov channel ntau tshaj ib fiber ntau qis dua - CWDM yuav zoo. Yog tias cov fiber ntau tsis tshua muaj, pheej yig rau kev xauj tsev, lossis lub cev nyuaj ntxiv (xws li, txoj hauv kev congested ducts, submarine crossings, los yog sib koom conduit nrog txwv tsis pub muaj peev xwm), DWDM qhov siab dua spectral efficiency ncaj qha txo nqi infrastructure.

Kauj Ruam 5: Qhov tseem ceeb ntawm cov qauv kev ua haujlwm thiab pab pawg muaj peev xwm.
Kev xa mus rau CWDM passive yuav tsum tau kho qhov muag tsawg kawg nkaus - txheej txheej txheej - nws ua haujlwm yuav luag zoo li ntsaws rau hauv ib lub cable. Lub active DWDM platform xav tau kev nkag siab ntawm optical zog theem, OSNR, amplifier configuration, thiab tejzaum nws kho qhov muag network tswj software. Ntsuam xyuas seb koj pab neeg ua haujlwm puas tau nruab rau cov cuab yeej xaiv, lossis seb koj puas xav tau cov neeg muag khoom txhawb nqa lossis cov kev pabcuam tswj hwm.

Feem ntau yuam kev thaum xaiv ntawm CWDM thiab DWDM

Kho qhov kev txiav txim raws li cov nqe lus nug xwb.
Qhov pheej yig tshaj transceiver tsis yog ib txwm pheej yig tshaj network. Yog hais tias koj outgrow CWDM nyob rau hauv peb lub xyoos thiab ntsib ib tug tag nrho optical -txheej txheej hloov, qhov "txuag" ntawm lub sij hawm xa mus hloov mus rau hauv tus nqi loj dua li pib nrog DWDM yuav tau.

Ignoring lub amplification ciam teb.
Ntau pawg ntsuam xyuas CWDM vs DWDM raws li qhov yuav tsum tau ua nyob deb tam sim no yam tsis tau txiav txim siab seb puas yuav hloov pauv hauv lub network yav tom ntej (qhov chaw nyob deb nroog tshiab, nce ncua ntev, kev hloov pauv fiber ntau) yuav thawb cov kev sib txuas dhau mus tsis tau. Yog tias qhov ntawd tshwm sim nrog CWDM, koj tsis tuaj yeem tsuas ntxiv lub suab nrov - koj yuav tsum rov ua dua -engineer tag nrho WDM txheej.

Tsis meej pem channel suav nrog muaj peev xwm.
DWDM system nrog 40 channels ntawm 100G txhua tus xa 4 Tbps. CWDM system nrog 18 channels ntawm 10G txhua tus xa 180 Gbps. Qhov nominal channel suav qhov sib txawv (40 vs 18) understates lub peev xwm sib txawv los ntawm ib qho ntawm 20. Thaum ntsuas qhov muaj peev xwm, nco ntsoov xav txog ib -channel cov ntaub ntawv tus nqi nrog rau suav channel.

Overlooking fiber ntau compatibility.
CWDM nyob ntawm kev siv wavelengths thoob plaws ntau yam, nrog rau cov bands cuam tshuam los ntawm qhov siab nqus dej. Yog tias koj cov nroj tsuag fiber ntau uas twb muaj lawm siv cov laus uas tsis yog- qis- dej- ncov fiber ntau, ntau CWDM channels yuav tsis muaj lossis nyob deb- txwv. Tshawb xyuas koj cov lus qhia fiber ntau ua ntej cog lus rau tag nrho 18-channel CWDM tsim.

Cia siab rau cov rooj sib piv dav dav raws li kev qhia txog engineering.
Txhua qhov kev xa tawm muaj qhov tshwj xeeb ntawm cov nroj tsuag fiber ntau, kev siv nyiaj poob qis, kev suav qhov sib txuas, hom txuas, thiab kev txwv ib puag ncig. Siv cov kev sib piv luam tawm raws li lub hauv paus pib, tab sis ib txwm siv tau tawm tsam koj cov peev nyiaj sib txuas thiab tsim network ua ntej ua tiav kev xaiv WDM thev naus laus zis.

FAQ

Puas yog CWDM pheej yig dua DWDM?

Rau kev xa tawm thawj zaug, yog - CWDM transceivers thiab passive multiplexers feem ntau raug nqi tsawg dua ib channel tshaj qhov sib npaug ntawm DWDM. Txawm li cas los xij, yog tias koj qhov kev xav tau muaj peev xwm loj dua li qhov CWDM tuaj yeem xa tuaj, tag nrho cov nqi ntawm lub neej yuav nyiam DWDM vim nws qhov kev ua kom muaj zog ntau dua thiab kev zam ntawm tus nqi nruab nrab ntawm - lub neej kev siv tshuab tsiv teb tsaws.

Dab tsi yog qhov txawv ntawm CWDM thiab DWDM channel sib nrug?

CWDM siv qhov chaw ruaj khov 20 nm wavelength spacing (ibITU-T G.694.2), thaum DWDM siv ntau zaus -raws li qhov sib nrug - feem ntau 100 GHz (~ 0.8 nm) lossis 50 GHz (~ 0.4 nm), raws li tau hais los ntawmITU-T G.694.1. Qhov kev sib tw nruj dua no yog qhov tso cai rau DWDM los txhawb cov channel ntau dua ntawm tib lub fiber ntau.

CWDM thiab DWDM puas tuaj yeem siv rau tib lub fiber ntau?

Yog, nyob rau hauv tej configurations. Hybrid designs tau overlay DWDM channels (feem ntau nyob rau hauv C-band nyob ib ncig ntawm 1530–1565 nm) nrog rau CWDM channels ntawm tib fiber, tsuav yog lub wavelength assignments tsis sib tshooj. Txoj hauv kev no yog qhov muaj txiaj ntsig zoo rau kev txhim kho theem uas muaj peev xwm CWDM uas twb muaj lawm yuav tsum tau txuas ntxiv yam tsis muaj kev hloov pauv tag nrho.

Qhov twg yog qhov zoo dua rau cov ntaub ntawv chaw sib cuam tshuam - CWDM lossis DWDM?

Nws nyob ntawm qhov ntsuas thiab qhov nrug. Rau luv luv -DCI nrug nrog ib txhais tes ntawm 10G lossis 25G txuas, CWDM tuaj yeem txaus thiab raug nqi- zoo. Rau siab - muaj peev xwm DCI xav tau kaum ob ntawm 100G lossis 400G wavelengths hla metro deb, DWDM yog tus qauv mus kom ze. Feem ntau hyperscale thiab kev lag luam loj DCI xa tawm hnub no siv DWDM.

Vim li cas CWDM tsis tuaj yeem siv EDFA amplification?

EDFAs (erbium{0}}doped fiber amplifiers) muab qhov nce hauv C-band, kwv yees li 1530–1565 nm. CWDM channels raug faib thoob plaws ntau qhov dav (1271–1611 nm), nrog rau feem ntau cov channel poob sab nraum EDFA nce qhov rais. Tsis muaj ib qho kev siv tshuab ua suab nrov uas tuaj yeem txhawb nqa tag nrho 18 CWDM channels ib txhij. Qhov no yog vim li cas CWDM txwv tsis pub muaj kev nthuav dav, thiab nws yog qhov laj thawj tseem ceeb DWDM yog qhov nyiam rau txhua qhov kev tsim network uas thaum kawg yuav xav tau kev nthuav dav kho qhov muag.

Muaj pes tsawg channel CWDM txhawb vs DWDM?

CWDM txhawb nqa txog 18 raws (1271–1611 nm ntawm 20 nm qhov sib nrug). DWDM txhawb nqa 40 raws ntawm 100 GHz qhov sib nrug, 80 raws ntawm 50 GHz qhov sib nrug, thiab ntau dua nrog 25 GHz lossis hloov kho kab sib chaws - tag nrho hauv C-band ib leeg. Txuas mus rau L-band tuaj yeem kwv yees li ob npaug ntawm DWDM channel suav.

Hom fiber ntau ua haujlwm zoo tshaj rau CWDM thiab DWDM?

Ob lub thev naus laus zis khiav dhau tus qauv ib zaug - hom fiber ntau (ITU-T G.652). Rau CWDM, siv tsawg- dej- ncov fiber ntau (G.652.C los yog G.652.D) yog pom zoo kom ua kom tag nrho 18 wavelength channels siv tau. DWDM ua haujlwm feem ntau hauv C-band qhov twg fiber ntau attenuation twb tsis tshua muaj, yog li hom fiber ntau tsawg dua qhov txwv - txawm tias G.652.D tseem yog tus qauv nyiam rau kev teeb tsa tshiab.