Wavelength division multiplexing (WDM), suav nrog CWDM (coarse wavelength division multiplexing) thiab DWDM (dense wavelength division multiplexing), thiab lwm yam. Nws yog hais txog kev sib txuas ntawm ntau lub teeb liab ntawm qhov sib txawv wavelengths ntawm ib qho fiber ntau rau tib lub sijhawm sib kis.
Nws muaj multiplexer thiab de-multiplexer. Lub multiplexer (MUX) sib txuas ntau lub teeb liab wavelengths hauv ib qho fiber ntau rau kev sib kis ntawm sab transmitter; lub de-multiplexer (DEMUX) cais ntau lub wavelength signals kis nyob rau hauv ib tug fiber ntau ntawm receiver sab. Lub hom phiaj tseem ceeb ntawm WDM yog txhawm rau txhawm rau txhawm rau muaj qhov muaj bandwidth ntawm fiber ntau, uas tuaj yeem nthuav dav los ntawm WDM yam tsis tas yuav nteg ntau fibers.
Dab tsi yog qhov txawv ntawm CWDM thiab DWDM?
- Qhov sib txawv wavelength ib ntus
CWDM: wavelength intervalNtau tshaj lossis sib npaug rau 20nm, feem ntau yog siv yim pawg ntawm 1470 ~ 1610nm nrog 20nm ntu, (HTF: 1270nm ~ 1610nm)
DWDM: wavelength interval<10nm, usually="" using="" 1550~1570nm="" band="" with="" wavelength="" interval="" of="" 200ghz="" (1.6nm),="" 100ghz="" (0.8nm)="" or="" 50ghz="" (0.4nm),="" (htf:="">
- Modulated lasers txawv
Feem ntau, CWDM modulated lasers siv uncooled lasers, thaum DWDM siv txias lasers. Lub laser txias siv qhov ntsuas kub, thiab lub laser tsis txias siv hluav taws xob tuning.
Dab tsi yog qhov zoo ntawm CWDM vs DWDM?
Piv nrog DWDM, qhov zoo tshaj plaws ntawm CWDM system yog tus nqi qis, tus nqi ntaus ntawv yog nyob rau hauv lim thiab laser. 20nm dav wavelength ncua sij hawm ua rau CWDM tsis tshua muaj kev Performance index yuav tsum tau rau laser, optical multiplexer / demultiplexer qauv yooj yim, tus nqi yield nce, yog li tus nqi txo.
DWDM tuaj yeem tsim nyog rau kev sib kis mus ntev. Piv nrog rau CWDM, DWDM nrog qhov sib sib zog nqus wavelength, uas tuaj yeem nqa 8 ~ 160 wavelengths ntawm ib qho fiber ntau, yog qhov tsim nyog rau kev sib kis mus ntev. Nrog kev pab los ntawm EDFA (Erbium Doped Fiber Amplifier), DWDM tshuab tuaj yeem ua haujlwm ntau txhiab mais.
Dab tsi yog qhov txawv ntawm CWDM thiab DWDM daim ntawv thov scenarios?
Ua ke cov yam ntxwv sib txawv saum toj no ntawm CWDM thiab DWDM, lawv cov ntawv thov scenarios kuj txawv.
CWDM yog siv rau: metro network nkag txheej, telecom, enterprise network, campus network, thiab lwm yam.
DWDM yog tsim rau: kev ncua deb, muaj peev xwm loj nyob deb ntawm lub cev network, lossis lub peev xwm loj metro network core node
CCWDM yog dab tsi?
CCWDM hu ua Compact Coarse Wavelength Division Multiplexer, uas yog ib qho mini version ntawm CWDM. Nws yog raws li TFF (thin film filter) WDM thev naus laus zis thiab ua haujlwm tib yam li CWDM, nrog qhov sib txawv uas CCWDM cov kab uas nyob ib sab yog cascaded hauv qhov chaw dawb uas siv cov kab teeb sib txuas es tsis txhob siv cov fibers optical. Yog tsis muaj fiber ntau siv rau cascading, qhov loj ntawm CCWDM pob lub thawv yog tag nrho 10 npaug me dua li tus qauv CWDM pob.
Qhov txawv ntawm CWDM thiab CCWDM yog dab tsi?
CWDM tshuab siv tus nqi qis, txias-dawb cov lus tawm tswv yim (DFB) lasers, thaum CCWDM muaj cov qauv sib txawv nrog cov collimator thiab lim welded ntawm ib qho substrate.
Peb-chaw nres nkoj lim rau CWDM ntawm ib lub wavelength tshwj xeeb muaj ib lub wavelength channel uas muaj ob lub lo ntsiab muag thiab TFF sib phim rau qhov tshwj xeeb wavelength. Qhov chaw nres nkoj ntawm txhua lub lim yog txuas nrog rau qhov chaw nres nkoj ntawm cov lim tom ntej, thiab cov lim dej txuas nrog rau ib leeg ntawm fiber ntau optic connectors, piv txwv li, CWDM multiplexer.
CCWDM txoj cai yog siv lub lens input kom pom lub teeb liab ntawm wavelength λ1, λ2...λn ntawm cov input fiber ntau rau thawj lim; lub teeb liab teeb liab ntawm wavelength λ1 dhau los ntawm thawj lim thiab ua ke rau thawj cov zis fiber ntau los ntawm thawj qhov tso zis lens cais lub teeb liab ntawm wavelength λ1; tus so ntawm lub teeb pom kev zoo yog reflected los ntawm thawj tus swb mus rau tus swb tom ntej rau qhov seem ntawm qhov muag pom tau pom los ntawm thawj tus swb mus rau tus swb tom ntej rau kev sib cais ntawm optical teeb liab; thiab lwm yam kom txog thaum tag nrho cov teeb liab sib cais. Lub coupling ntawm lub wavelength raws yog tiav nyob rau hauv daim ntawv ntawm ib tug ncaj kab uas ua raws li ib tug "zigzag" txoj kev.
Los ntawm tus nqi pom, CCWDM yog pheej yig dua CWDM thiab DWDM. 5G yog lub hauv paus tseem ceeb hauv keeb kwm ntawm kev sib txuas lus, nrog rau kev lag luam loj thiab ntau qhov kev sib tw, thiab WDM cov kev daws teeb meem tuaj yeem txuag tau ntau cov khoom siv fiber ntau. HTF muaj peev xwm tsim thiab tsim WDM. Nug koj cov kev xav tau thiab peb yuav muab cov kev pabcuam customized rau koj.
