Qhov kev ncua deb ntawmkho qhov muag modulemuab faib ua luv luv, nruab nrab nrug thiab ntev. Feem ntau luv luv kis tau tus mob yog qhov kis tau tus mob nyob rau hauv qab 2km, nruab nrab nrug yog 10-20km.Ntau dua lossis sib npaug30km yog kis tau tus mob ntev. Lub teeb feem ntau siv nyob rau hauv optical fiber yog 850nm, 1310nm, 1550nm, peb lub teeb wavelengths ntev dua, yog li tsis tshua muaj attenuation ntawm optical fiber, thiab peb wavelengths no yuav luag xoom nqus, qhov zoo tshaj plaws rau fiber optic kis tau tus mob. Los ntawm kev tsom xam ntawm kev siv wavelengths ntawm optical modules, nws yog ib qho yooj yim los txiav txim siab tias feem ntau luv luv kis tau tus mob, nyob rau hauv 500m feem ntau yog siv 850nm wavelength. 500m mus rau 20km feem ntau siv 1310nm wavelength. 20-40km tuaj yeem xaiv 1310nm, 1550nm.Ntau dua lossis sib npaug40 feem ntau siv 1550nm wavelength. Ntawm no yog ob peb hom wavelengths thiab lawv cov yam ntxwv.
1) 850nm: multimode kev sib txuas lus hom, attenuation kuj loj, thiab 850nm optical module nrog lub teeb qhov chaw transmitter thiab teeb liab converter nqi yog tsawg dua tus nqi ntawm 1310nm thiab 1550nm li, yog ib tug heev yig txoj kev ntawm kev sib txuas lus. Yog li feem ntau ntawm multimode optical fiber ntau nrog kev ua haujlwm wavelength ntawm 850nm optical module rau kev sib txuas sib txuas. 850nm wavelength 100 megabit optical module tuaj yeem xa mus txog 2km, gigabit tuaj yeem xa mus txog 550m, 10 gigabit tuaj yeem xa mus txog 300m, 40G tuaj yeem xa mus txog 400m, 100G, 400G tuaj yeem xa mus txog 100m.
2) 1310nm: fiber ntau rau 1310nm attenuation ntawm li 0.35dB/km, nrog multimode, qhov deb tshaj plaws kis tau tus mob nyob deb ntawm 2km, nrog ib leeg-mode kis deb tshaj plaws ntawm 40km. 1310nm wavelength, 100 megabit, gigabit, 10 megabit, 40G, 100Goptical modulestuaj yeem kis tau mus txog 40km, 400G kis tau tus mob deb tshaj plaws txog li 500m.
3) 1550nm: fiber ntau attenuation ntawm 1550nm kuj me me, txog 0.19dB/km. yog li tib lub zog, 1550nm wavelength tshaj 1310nm wavelength xa mus deb. 1550 wavelength nyob rau hauv 100 megabit, gigabit optical modules mus txog 160km kis nrug deb, 10 gigabit optical modules mus txog 80km kis nrug deb. (40G, 100G optical modulesNtau dua lossis sib npaug) 40km deb kis tau tus mob feem ntau yuav xaiv siv CWDM lossis DWDM)
Vim li cas thiaj txhais hauv peb pawg no? Qhov no muaj feem xyuam rau cov teeb liab optical kis nruab nrab fiber ntau poob. Los ntawm kev tshawb fawb tsis tu ncua, tib neeg pom tias fiber ntau poob feem ntau txo nrog lub wavelength lengthening, 850nm poob tsawg, 900 ~ 1300nm poob thiab ua siab dua; thiab 1310nm thiab ua qis dua, 1550nm poob qis tshaj, 1650nm poob nyhav nce. Yog li 850nm yog lub qhov rais luv luv wavelength, 1310nm thiab 1550nm yog qhov ntev wavelength qhov rais.
