CWDM vs. DWDM: Qhov twg Yog Koj Lub Network Xav Tau tiag tiag?

Taw qhia

Kuv tau nug cov lus nug no ntau heev: 'Peb xav tau fiber ntau. Peb puas yuav mus CWDM lossis DWDM?' Kuv cov lus teb ncaj ncees yeej ib txwm zoo ib yam: nws nyob. Tab sis tom qab ntau xyoo ntawm kev ua haujlwm ntawm kev xa tawm fiber ntau thoob plaws hauv xov tooj cua thiab cov pob txha caj qaum, kuv tau pom tias cov neeg feem ntau cuam tshuam qhov kev txiav txim siab. Thaum koj nkag siab tias txhua lub tshuab ua tau zoo li cas thiab qhov twg nws haum, qhov kev xaiv yog feem ntau ua kom pom tseeb.

Wavelength Division Multiplexing (WDM) yog cov thev naus laus zis uas tso cai rau koj xa ntau cov ntaub ntawv ntws los ntawm ib qho fiber ntau tib lub sijhawm, txhua qhov sib txawv ntawm lub teeb. Xav txog nws zoo li txoj kev loj uas muaj ntau txoj kab. WDM tsim txoj kab. Ob txoj hauv kev los ua qhov no yog Coarse WDM (CWDM) thiab Dense WDM (DWDM). Ob leeg daws qhov teeb meem tib yam nkaus, tab sis lawv ua nws txoj hauv kev sib txawv, nrog cov nqi sib txawv heev thiab kev ua tau zoo.

Cov ntawv tshaj tawm no rhuav tshem txhua tus ua haujlwm li cas, qhov twg txhua tus ua rau muaj kev nkag siab, thiab qhov tiag -kev xa tawm thoob ntiaj teb zoo li cas. Kuv kuj tau suav nrog lub rooj sib piv kom koj tuaj yeem pom qhov sib txawv tseem ceeb ntawm ib nrais muag.

I. CWDM: Qhov Yooj Yim, Nyiaj Txiag - Kev Xaiv Tus phooj ywg

Nws ua haujlwm li cas

CWDM muab cov kab hluav taws xob sib nrug deb ntawm ib leeg, feem ntau 20 nm ntawm txhua tus. ITU-T G.694.2 tus qauv txhais tau 18 channels thoob plaws qhov ntau ntawm 1270 nm txog 1610 nm. Hauv kev xyaum, feem ntau kev xa tawm tsuas yog siv 8 ntawm cov channel, los ntawm 1470 nm txog 1610 nm, vim tias cov zaum hauv ib feem ntawm fiber ntau qhov teeb liab poob qis tshaj.

Qhov dav dav ntawd yog tus yuam sij rau vim li cas CWDM pheej yig. Thaum cov channel sib nrug deb, cov ntxaij lim dej kho qhov muag uas cais lawv tsis tas yuav tsum yog super meej. Koj tuaj yeem siv cov khaubncaws sab nraud povtseg tsawg dua, kev tsim khoom yooj yim dua, thiab ntau chav dhau los ntawm kev kuaj xyuas zoo. Tag nrho cov no txhais tau tias tus nqi qis dua rau tus neeg yuav khoom kawg.

Tiag -Lub Ntiaj Teb Piv Txwv: Lub Nroog Metro Networks

Ib qho piv txwv zoo yog yuav ua li cas lub nroog me me ISPs thiab hauv nroog fiber ntau network siv CWDM. Lub nroog Amsterdam lub nroog fiber ntau network, CityNet, tau siv CWDM rau nws txoj kev nkag tau -txheej txheej txuas nyob rau thaum ntxov 2010s los txuas ntau pua tus neeg siv khoom lag luam thoob plaws hauv nroog luv luv yam tsis muaj kev siv nyiaj ntau dhau ntawm kev tsim kho vaj tse. Qhov kev ncua deb tau zoo nyob rau hauv 20 km, thiab lub peev xwm ntawm ib qhov txuas tau txaus rau cov tsheb khiav thaum lub sijhawm ntawd. Lawv tau txais txoj haujlwm ua tiav ntawm ib feem ntawm qhov DWDM rollout yuav raug nqi dab tsi.

Tau qhov twg los: Amsterdam CityNet cov ntaub ntawv qhia txog qhov project, hais hauv Ovum Telecom Infrastructure Analysis (2013). Tus nqi zoo sib xws-tsav CWDM xa mus rau hauv IEEE Communications Magazine, Vol. 41, Tsis yog. 2.

Lwm qhov kev siv feem ntau yog kev lag luam hauv tsev kawm ntawv network. Ib lub tsev kawm ntawv txuas nws cov chaw khaws ntaub ntawv hla ob peb lub tsev, lossis lub tsev kho mob txuas cov duab servers ntawm cov chaw 10 km sib nrug, yuav luag ib txwm xaiv CWDM. Cov lej ua haujlwm tawm: tus nqi qis dua, iav yooj yim, muaj peev xwm txaus.

Cov Txwv Koj Yuav Tsum Paub

CWDM muaj ob qhov kev txwv nyuaj uas tseem ceeb heev. Ua ntej, koj tau txais ntau tshaj 18 channels. Uas suab zoo li ntau kom txog thaum koj cov tsheb khiav ob zaug hauv peb xyoos thiab koj paub tias cov fiber ntau puv. Thib ob, CWDM tsis ua haujlwm nrog Erbium-Doped Fiber Amplifiers (EDFA), uas yog cov cuab yeej txheem rau kev nthuav dav cov teeb liab. Qhov no txhais tau tias CWDM txuas mus rau sab saum toj ntawm ib ncig ntawm 80 km yam tsis tau ntxiv cov khoom siv rov tsim dua tshiab. Rau ib lub nroog - teev kev xa tawm, feem ntau yog qhov zoo. Rau txhua yam loj dua, nws yog qhov teeb meem tiag tiag.

II. DWDM: Muaj Peev Xwm Loj, Ntev Ntev, Tus nqi siab dua

Nws ua haujlwm li cas

DWDM ntim cov channel sib ze heev. ITU-T G.694.1 tus qauv qhia qhov sib nrug ntawm 0.4 nm (50 GHz), 0.8 nm (100 GHz), thiab 1.6 nm (200 GHz). Feem ntau cov tshuab ua haujlwm hauv C-band, kwv yees li 1525 nm txog 1565 nm, txawm hais tias cov tshuab tshiab tau thawb rau hauv L-band zoo li txhawm rau txhawm rau muaj peev xwm ntau dua.

Vim tias cov channels nyob ze ua ke, cov khoom siv DWDM yuav tsum muaj ntau yam meej. Cov lasers xav tau kev ua kom txias thiab lub voj voog ntev - xauv kom ruaj khov. Cov lim xav tau ntau txheej txheej txheej. Tag nrho cov no ua rau tus nqi tsim khoom thiab tus nqi system. Tab sis qhov koj tau txais rov qab yog qhov txaus ntshai: 40, 80, 96, lossis txawm tias 160+ channels ntawm ib khub fiber ntau, txhua qhov khiav ntawm 10, 100, lossis 400 Gbps.

Tiag -Cov Piv Txwv Ntiaj Teb: Cov Kab Ncauj Ncauj

Saib ntawm ib qho loj hauv internet qaum thiab koj tab tom saib DWDM. Google tus kheej fiber ntau network, uas txuas nws cov ntaub ntawv chaw thoob ntiaj teb, khiav ntawm DWDM infrastructure muaj peev xwm nqa tau ntau pua terabits ib ob. Raws li Google's 2022 cov ntaub ntawv nthuav tawm, lawv cov pob txha caj qaum siv 400G wavelengths ntawm DWDM systems, nrog rau cov phiaj xwm ntsuas rau 800G ib lub wavelength siv cov qauv kev hloov kho siab heev.

Source: Google Cloud Next 2022 keynote thiab Google Network Infrastructure team blog post, 'Tsim lub ntiaj teb-scale network' (2022). Saib ntxiv: Phau ntawv Journal of Lightwave Technology, Vol. 40, No. 11 - 'Tshuaj nyob rau hauv Submarine thiab Terrestrial DWDM Systems.'

Submarine cables yog lwm qhov chaw uas DWDM tsuas yog qhov kev xaiv tiag tiag. 2Africa cable system, ib qho ntawm cov kab hluav taws xob ntev tshaj plaws hauv ntiaj teb ntawm ntau dua 45,000 km, tso siab rau DWDM nkaus rau kev thauj mus los ntawm Africa, Europe, thiab Asia. Tsis muaj lwm yam thev naus laus zis uas tuaj yeem ua qhov haujlwm ntawd. EDFA amplifiers muab tso rau txhua 50-80 km raws lub cable txhawb nqa tag nrho cov DWDM channel ib zaug, uas yog qhov ua rau ultra- ntev-ntev kis tau tus mob kev lag luam.

Qhov chaw: Meta thiab cov koom tes '2Africa cable tshaj tawm (2021); Kev qhia tshwj xeeb los ntawm SubCom thiab Alcatel Submarine Networks (ASN).

Qhov Zoo Tshaj Plaws: EDFA Compatibility

Kuv xav tias EDFA compatibility point tsis tau txais kev mloog txaus. Thaum koj siv DWDM hauv C-band, ib qho EDFA tuaj yeem ua kom nrov rau txhua qhov ntawm cov fiber ntau tib lub sijhawm. Koj tsis tas yuav hloov lub teeb liab rov qab rau hauv daim ntawv hluav taws xob thiab rov qab mus rau lub teeb dua. Qhov no ua rau lub kaw lus yooj yim, txo qis latency, thiab ua rau nws siv tau los tsim cov kev sib txuas uas hla ntau txhiab mais. Qhov no yog ib qho laj thawj loj tshaj DWDM dominates ntev -haul thiab qaum tes hauj lwm.

III. CWDM vs. DWDM: Sab-los ntawm-Side

Cov lus sib piv ceev

Nov yog qhov ncaj nraim saib yuav ua li cas ob lub thev naus laus zis sib piv thoob plaws qhov ntev uas tseem ceeb tshaj plaws rau kev npaj network:

Koj yuav tsum xaiv qhov twg?

Cov lus teb ncaj ncees: yog tias koj cov kev txuas qis dua 80 km thiab koj xav tau tsawg dua 10 Gbps ib channel nrog 18 lossis tsawg dua, CWDM yuav txuag koj cov nyiaj tiag. Ib daim ntawv tshaj tawm 2021 Dell'Oro Group ntawm kev thauj khoom kho qhov muag tau sau tseg tias CWDM tseem yog qhov kev xaiv tseem ceeb rau kev lag luam thiab kev siv metro nkag hauv qab 80 km, qhov twg nws tuaj yeem txiav cov peev txheej pib los ntawm 30-60% piv rau DWDM lwm txoj hauv kev.

Tau qhov twg los: Dell'Oro Group, 'Optical Transport Market Report Q4 2021.' Kuj tseem hais txog hauv Kev Nyeem Ntawv Teeb pom kev zoo ntawm metro fiber ntau tiam sis, Lub Ib Hlis 2022.

Yog tias koj xav tau ntau dua 18 channel, ntau dua 80 km ntawm kev ncav cuag, lossis koj tab tom tsim ib yam dab tsi uas yuav tsum tau ntsuas ntau pua Gbps lossis terabits, ces DWDM yog qhov hu raug. Tus nqi siab dua yog qhov tiag, tab sis yog li lub peev xwm qab nthab koj ntaus nrog CWDM. Ntau tus neeg ua haujlwm tau kawm txog qhov nyuaj no, siv CWDM rau kev txuag nqi thiab tom qab ntawd yuav tsum tau rhais thiab hloov hauv tsib xyoos thaum tsheb khiav tawm.

Ib yam uas tsim nyog sau cia: hauv ntau lub network tiag tiag, ob lub thev naus laus zis sib koom ua ke. DWDM tswj cov pob txha caj qaum thiab cov txheej txheem tseem ceeb. CWDM suav nrog kev nkag mus thiab faib cov npoo. Qhov no tsis yog kev sib haum xeeb. Nws yog tiag tiag tus tsim ntse uas siv txhua lub tshuab uas nws haum zoo tshaj plaws.

Xaus

CWDM thiab DWDM tsis yog cov khoom sib tw. Lawv yog cov cuab yeej siv rau kev ua haujlwm sib txawv. CWDM yog qhov yooj yim, pheej yig, thiab zoo - haum rau cov txuas luv luv nrog cov kev xav tau muaj peev xwm. DWDM tsuas yog qhov kev xaiv loj thaum koj xav tau lub peev xwm loj, ncav cuag ntev, lossis lub network uas tuaj yeem ntsuas tau ntau xyoo tom ntej.

Yog tias kuv yuav tsum tau muab ib qho lus qhia: tsis txhob cia li npaj rau hnub no. Saib ntawm koj qhov kev loj hlob ntawm kev kwv yees nyob rau tsib mus rau xya xyoo tom ntej ua ntej cog lus rau kev siv tshuab. Kev xa tawm CWDM uas zoo li niaj hnub no tuaj yeem ua mob taub hau sai yog tias koj cov ntaub ntawv xav tau loj dua li qhov xav tau. DWDM raug nqi ntau dua, tab sis nws muaj hnub nyoog zoo dua.

Qhov xov xwm zoo yog tias kev lag luam kho qhov muag tau loj hlob txaus tias ob lub thev naus laus zis tau zoo- txhawb nqa, zoo- cov ntaub ntawv, thiab muaj los ntawm ntau tus neeg muag khoom. Txawm hais tias koj tab tom tsim lub tsev kawm ntawv txuas los yog lub hauv paus qaum teb, cov cuab yeej muaj nyob. Qhov tseem ceeb tsuas yog ua kom paub tseeb tias koj siv qhov yog.