WDM --- wavelenth faib multiplexing yog thev naus laus zis uas sib txuas ob lossis ntau qhov kev sib txuas lus sib txuas ntawm cov sib txawv ntawm qhov ntev sib txawv ntawm qhov sib kis kawg los ntawm multiplexer thiab txuas rau tib lub fiber ntau ntawm optical kab rau kis; ntawm qhov tau txais kawg, kho qhov muag teeb ntawm ntau lub wavelengths tau sib cais los ntawm demultiplexer, thiab tom qab ntawd tus neeg kho qhov muag tau ua cov txheej txheem txuas ntxiv kom rov ua tau cov cim pib. Lub thev naus laus zis ntawm xa ob lossis ntau qhov cim ntawm qhov sib txawv ntawm lub yoj yob sib txawv hauv tib lub fiber ntau hu ua wavelength division multiplexing.
Lub teeb hluav taws xob sib txawv muaj qhov sib txawv ntawm cov kis tsis tau hauv cov xov hluav taws xob. Txhawm rau kom txo qhov poob kom ntau li ntau tau thiab xyuas kom meej cov kis sib kis, nws yog ib qho tsim nyog yuav tsum nrhiav qhov tsim nyog nthwv dej rau kev xa xov. Tom qab lub sijhawm ntev ntawm kev tshawb nrhiav thiab kev sim, lub teeb liab cuam tshuam los ntawm kev tawg yog qhov tsawg tshaj plaws thiab qhov poob yog qhov qis tshaj plaws hauv 1260nm-1625nm wavelength ntau, uas yog qhov tsim nyog tshaj rau kev xa hauv fiber ntau.
Qhov ua tau wavelengths ntawm optical fiber tau muab faib ua ob peb pawg. Txhua qhov qhab nia yog siv los ua ywj siab channel kom xa cov kab hluav taws xob ua ntej qhov kev txiav txim siab. ITU-T faib cov kab ke ntau zaus ntawm ib hom fiber ntau saum 1260nm rau hauv O, E, S, C, l thiab U.
O band yog dab tsi?
O-band yog thawj pab pawg 1260-1360 nm. O-band yog thawj lub viav vias sib xyaw siv nyob rau hauv kev sib txuas lus kho qhov muag hauv keeb kwm, thiab lub teeb liab cuam tshuam (vim yog tawg) yog qhov tsawg tshaj plaws.
E-band yog dab tsi?
E-band (ncua ntev ntawm qhov ntev: 1360-1460 nm) yog qhov tsawg tshaj plaws ntawm cov bands no. E-band feem ntau yog siv los ua kev txuas ntxiv ntawm o-band, tab sis nws tsis tshua muaj siv. Qhov laj thawj tseem ceeb yog tias muaj ntau lub kho qhov muag kho qhov muag pom tau hais tias muaj kev ntseeg siab hauv E-band thiab cov txheej txheem tsim tawm yog kev siv hluav taws xob ntau, yog li kev siv E-band hauv kev sib txuas lus kho qhov muag tau txwv.
S band yog dab tsi?
Cov fiber ntau poob hauv S-band (nthwv dej band: 1460-1530 nm) yog qhov qis dua qhov ntawd hauv o-band. S-band siv cov tshuab PON (passive optical network) ntau.
Dab tsi yog C band?
C-band thaj tsam los ntawm 1530 nm txog 1565 nm, sawv cev ntawm cov pab pawg sib txawv. Optical fiber muaj qhov poob qis hauv C-band, thiab muaj qhov zoo hauv qhov kev xa xov mus ntev. Nws feem ntau yog siv ntau hauv metro, deb-deb, ultra ntev-nrug thiab submarine optical kis tau tus mob sib xyaw ua ke nrog WDM thiab EDFA thev naus laus zis. Raws li qhov kev sib kis tau ntev dhau los ua ntev dua thiab fiber ntau lub tshuab hluav taws xob siv tsis yog kho qhov muag rau electron rau optical dua, cov C-band hloov zuj zus thiab tseem ceeb dua. Nrog kev rov tshwm sim ntawm DWDM (ntom ntom ntom ntaws sib faib ua ntau yam sib txuam) uas tuaj yeem ua rau ntau lub teeb liab sib koom nrog ib leeg, siv cov C-band tau nthuav dav.
Dab tsi yog L band?
L-band (ntev wavelength: 1565-1625 nm) yog qhov poob qis dua thib ob wavelength band, uas feem ntau siv thaum C-band tsis txaus kom tau raws li bandwidth. Nrog kev siv dav dav B-doped fiber ntau lub tshuab hluav taws xob (EDFA), DWDM cov tshuab tau txuas ntxiv rau L-band, uas feem ntau siv los nthuav cov peev txheej ntawm thaj av DWDM optical network. Tam sim no nws tau qhia rau submarine cable cov tswj hwm los ua tib qho - kom nthuav dav tag nrho cov peev txheej ntawm submarine cable.
Vim tias qhov kis tau kis poob ntawm C-band thiab L-band yog qhov tsawg kawg, cov teeb liab teeb liab hauv DWDM system feem ntau hauv C-band thiab L-band. Ntxiv nrog rau o-band rau L-band, tseem muaj ob lwm pab pawg, uas yog 850 nm band thiab U-Band (ultra ntev band: 1625-1675 nm). Lub 850 nm band yog lub ntsiab yoj ntawm multimode fiber kev sib txuas lus system, ua ke nrog VCSEL (ntsug kab noj hniav nto emitting laser). U-Band tsuas yog siv rau kev saib xyuas lub network.
Raws li hom wavelength sib txawv, WDM thev naus laus zis tuaj yeem muab faib ua WDM, CWDM thiab DWDM. Cov kab hluav taws xob kis ntawm 1470-1610nm feem ntau yog siv. DWDM channel spacing ntau ntom ntom nti, siv C-band (1530 nm-1565 nm) thiab L-band (1570 nm-1610 nm) kis tau rau kis. Cov kab hluav taws xob ntawm 1310 thiab 1550 nm feem ntau siv hauv WDM zoo tib yam.
Wavelength muab 40 yoj DWDM
Hom sib kis
Nrog rau kev loj hlob ntawm FTTH Cov Ntawv Thov, C-band thiab L-band, uas feem ntau siv hauv kho qhov muag network, yuav ua lub luag haujlwm tseem ceeb hauv kev xa xov kho qhov muag.
WDM thev naus laus zis tuaj yeem txhim kho qhov sib kis tau ntawm optical fiber thiab txhim kho kev siv cov khoom siv fiber ntau. Kev cuam tshuam ncaj qha tshaj plaws rau lub neej yog tias peb siv Is Taws Nem, saib TV thiab ua rau kev hu xov tooj tau sai dua thiab du.
HTF' s khoom kho qhov muag yog customized, qhov zoo yog lav, thiab cov khoom siv tau ntshuam.
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