Hauv qhov sib txuas xov tooj ntawm cov neeg sib txuas lus, kev faib zaus faib ntau zaus feem ntau yog siv los txhim kho qhov sib kis tau ntawm qhov system thiab ua kom tag nrho cov kev siv bandwidth ntawm cov cable, uas yog, cov cim ntawm ob peb tshooj tau kis ib txhij hauv tib lub cable, thiab cov teeb liab ntawm txhua cov channel tuaj yeem lim tawm los ntawm kev siv band-pass lim raws li cov khoom sib txawv raws cov chaw kawg ntawm qhov tau txais kawg. Ib yam li ntawd, kev faib cov zaus ntau zaus tuaj yeem siv los txhim kho qhov sib kis tau ntawm kev sib txuas lus fiber ntau. Demultiplexer (sib npaug rau cov kho qhov muag bandpass lim) yog siv nyob rau tom kawg tau txais los cais cov muaj qhov kho qhov muag ntawm txhua lub teeb liab. Vim tias qhov sib txawv loj ntawm cov teeb liab zaus hauv zaus zaus ntawm lub teeb, lub yoj yoj yoj feem ntau siv los txhais qhov txawv ntawm zaus, thiab hom kev ua haujlwm no hu ua WDM. WDM thev naus laus zis yog siv tag nrho ntawm tib hom fiber ntau qhov poob qis coj los ntawm cov peev txheej loj, raws li txhua zaus zaus (lossis nthwv dej) ntawm lub teeb ntoj hluav taws xob sib txawv ntawm cov fiber ntau poob qhov rais tuaj yeem faib ua ob peb channel, lub teeb raws li lub teeb liab ntawm cov khoom thauj, hauv tus xa xov siv USES lub ntsej muag sib faib wavelength multiplexer (lim) kom nyias qhov ntev ntawm lub teeb liab xa cov cab kuj sib xyaw ua ke ua ib leeg. Ib txoj kev sib kis ntawm qhov tau txais qhov kawg uas cov kev thauj khoom kho qhov muag no coj cov cim sib txawv ntawm cov kab sib txawv ntawm qhov sib txawv yog sib cais los ntawm ib qho kev faib tawm ntawm yoj ntev (WDM). Vim tias cov paib hluav taws xob xa hluav taws xob sib txawv ntawm cov kab hluav taws xob sib txawv tuaj yeem raug suav hais tias yog kev ywj pheej ntawm ib leeg (tsis txhob xav txog qhov tsis ua fiber ntau). Qhov sib txuam kis ntau ntawm cov khoom siv hluav taws xob tau pom tseeb hauv ib qho fiber ntau. Kev sib kis tau ob txoj kev tuaj yeem pom tau los ntawm kev npaj cov cim taw qhia hauv ob txoj kev qhia rau kis ntawm cov kab hluav taws xob sib txawv. Ua raws li WDM, cov xov tooj ntawm lub wavelengths tuaj yeem sib txuas tau kuj yog qhov sib txawv, xws li ntawm 2 txog rau kaum ob, thiab feem ntau ua lag luam raws li 8 txoj kab hluav taws xob thiab 16 wavelength, raws li qhov sib nrug ntawm qhov tso cai thauj khoom wavelength.
WDM yog qhov tseem ceeb heev qhov zaus faib ntau zaus multiplexing (FDM) thev naus laus zis hauv qhov muaj qhov ntau zaus. Raws li kev xa cov khoom siv technology hauv Suav rau ntau caum xyoo, nws ua raws txoj kev ntawm FDM-TDM-TDM FDM. Thaum pib, FDM simulation thev naus laus zis tau siv rau ob qho qhib hlau thiab coaxial cable, namely zaus faib multiplexing technology ntawm cov hluav taws xob. Qhov bandwidth ntawm txhua lub suab channel yog 4 KHz, thiab txhua lub suab channel tso ib ntu ntawm bandwidth ntawm kis nruab nrab (xws li coaxial cable). PDH thiab SDH cov tshuab yog TDM baseband digital cov paib kis tau los ntawm cov kab hluav taws xob, nrog txhua lub suab ntawm 64KB / s. WDM thev naus laus zis yog optical fiber ntau zaus zaus faib ntau cov cuab yeej siv sib txuam, 16 (8) × 2.5Gb / s WDM system yog kev sib xyaw ntawm FDM analog technology ntawm optical zaus thiab TDM digital thev naus laus zis ntawm hluav taws xob zaus.
WDM yog qhov tseem ceeb heev qhov zaus faib ntau zaus FDM thev naus laus zis hauv qhov kho qhov muag, thiab txhua txoj kab hluav taws xob tau pom los ntawm kev ua ntu zaus. Txhua txoj kab ntawm lub ntsej muag ntim cov kab kev sib txuas ntawm ntu ntawm cov kab ke kho qhov muag, uas txawv ntawm cov qub coaxial cable FDM thev naus laus zis: (1) cov xov xwm sib txawv, WDM system yog zaus ntu ntawm cov cim kho qhov muag, thaum coaxial system yog zaus ntu thiab siv hluav taws xob Pib ntsais koj teeb. (2) Hauv txhua channel, coaxial cable system xa cov cim digital 4 KHz suab lub suab, thaum WDM qhov tam sim no muaj digital signal SDH2.5GB / s lossis siab dua digital system ntawm txhua lub wavelength channel.
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