Qhov tseeb, lub teeb tau txhais los ntawm nws lub yoj yoj. Wavelength yog tus naj npawb sawv cev rau lub teeb ntawm lub teeb. Qhov ntau zaus, los sis xim, ntawm txhua lub teeb muaj lub suab sib xyaw nrog nws. Wavelength thiab zaus muaj ntau yam. Feem ntau hais lus, hluav taws xob luv luv yog qhia los ntawm nws lub yoj yoj, thaum hluav taws xob ntev ntev tau txheeb los ntawm nws cov zaus.
Qhov ntev nthwv dej feem ntau yog 800 txog 1600nm, tab sis tam sim no feem ntau siv wavelengths hauv cov hluav taws xob ntse yog 850nm, 1300nm thiab 1550nm. Multimode fiber ntau haum rau wavelengths ntawm 850nm thiab 1300nm, thaum ib hom fiber ntau yog qhov zoo tshaj plaws siv rau wavelengths ntawm 1310nm thiab 1550nm. Qhov sib txawv ntawm qhov ntev ntawm 1300nm thiab 1310nm tsuas yog hauv lub npe kev cai. Cov lasers thiab lub teeb ci ua kom zoo nkauj kuj tau siv rau lub teeb pom kev zoo hauv cov kho qhov muag. Lub laser tau ntev dua li cov kev siv ib hom nrog cov nthwv siab ntawm 1310nm lossis 1550nm, thaum siv cov duab hluav taws xob pom tau siv rau cov khoom siv multimode nrog qhov ntev ntawm 850nm lossis 1300nm.
Raws li tau hais ua ntej, feem ntau siv wavelengths hauv optical fiber ntau yog 850nm, 1300nm thiab 1550nm. Tab sis vim li cas peb xaiv peb qhov ntev ntawm lub teeb? Nws yog vim tias qhov ntsuas kab hluav taws xob ntawm peb txoj kab hluav taws xob no muaj qhov poob qis dua thaum kis hauv cov kab hluav taws xob. Yog li lawv yog qhov tsim nyog raws li muaj cov khoom siv hluav taws xob rau kev sib kis hauv cov xov hluav taws xob. Qhov poob ntawm iav fiber feem ntau los ntawm ob qho: kev poob thiab poob tawg. Qhov tsis haum yuav tsum tau tshwm sim ntawm qee qhov tshwj xeeb ntab ntaws peb hu" dej band", feem ntau vim yog nqus ntawm cov dej ntws tawm hauv cov khoom ntim iav. Qhov tawg tawg yog feem ntau tshwm sim los ntawm kev rov txuas ntxiv ntawm atoms thiab molecules ntawm lub khob.
Qhov tawg ntawm cov vuam ntev yog ntau me dua, uas yog qhov tseem ceeb ntawm wavelength. Los ntawm cov lus hauv qab no, peb tuaj yeem pom meej peb qhov qis-nqus thaj tsam thiab qhov nkhaus qhov twg cov tawg poob zuj zus raws li qhov ntev ntev yauv nce. Raws li koj tuaj yeem pom, nyob rau hauv peb lub cheeb tsam nthwv dej, qhov nqus yuav luag yog xoom.
Vim hais tias cov nthwv dej ploj ntawm 850nm, 1300nm thiab 1550nm yog qhov tsawg, lawv yog qhov kev xaiv zoo tshaj plaws rau kev sib txuas lus fiber ntau.