Fiber optic media yog ib qho kev sib txuas lus hauv network uas feem ntau siv iav, lossis yas fiber ntau hauv qee qhov tshwj xeeb, xa cov ntaub ntawv network hauv daim ntawv ntawm lub teeb pulses.Tsis pub dhau kaum xyoo dhau los, fiber ntau optical tau dhau los ua ib hom kev sib txuas lus network nrov dua li qhov xav tau ntawm bandwidth ntau dua thiab ntev dua txuas ntxiv mus.
Fiber optic thev naus laus zis yog qhov sib txawv hauv nws txoj haujlwm tshaj li tus qauv tooj liab xov xwm vim tias kev sib kis yog "digital" lub teeb pulses es tsis txhob siv hluav taws xob hloov hluav taws xob.Yooj yim heev, fiber ntau optic transmissions encode tus sawv daws yuav thiab xoom ntawm ib tug digital network kis tau tus mob los ntawm tig rau thiab tawm lub teeb pulses ntawm ib tug laser lub teeb qhov chaw, ntawm ib tug muab wavelength, ntawm heev zaus.Lub teeb ci yog feem ntau yog laser lossis qee yam ntawm Lub Teeb-Emitting Diode (LED).Lub teeb los ntawm lub teeb ci yog flashed rau thiab tawm hauv cov qauv ntawm cov ntaub ntawv raug encoded.Lub teeb mus rau hauv cov fiber ntau kom txog thaum lub teeb liab mus rau nws lub hom phiaj thiab tau nyeem los ntawm lub ntsuas qhov muag.
Fiber optic cables yog optimized rau ib los yog ntau tshaj wavelengths ntawm lub teeb.Lub wavelength ntawm ib lub teeb ci tshwj xeeb yog qhov ntev, ntsuas hauv nanometers (billionths ntawm ib lub 'meter', luv luv "nm"), nruab nrab ntawm nthwv dej peaks hauv lub teeb nthwv dej ntawm lub teeb ntawd.Koj tuaj yeem xav txog lub wavelength raws li cov xim ntawm lub teeb, thiab nws yog sib npaug rau qhov ceev ntawm lub teeb faib los ntawm zaus.Nyob rau hauv rooj plaub ntawm Single-Mode Fiber (SMF), ntau qhov sib txawv wavelengths ntawm lub teeb tuaj yeem kis tau los ntawm tib lub fiber ntau optical txhua lub sijhawm.Qhov no yog qhov muaj txiaj ntsig zoo rau kev ua kom muaj peev xwm kis tau tus mob ntawm fiber ntau optic cable txij li txhua qhov wavelength ntawm lub teeb yog ib lub teeb liab sib txawv.Yog li ntawd, ntau lub teeb liab tuaj yeem nqa hla tib txoj hlua ntawm optical fiber.Qhov no yuav tsum muaj ntau lub lasers thiab ntes thiab raug xa mus rau Wavelength-Division Multiplexing (WDM).
Feem ntau, optical fibers siv wavelengths ntawm 850 thiab 1550 nm, nyob ntawm seb lub teeb ci.Tshwj xeeb, Multi-Mode Fiber (MMF) yog siv ntawm 850 lossis 1300 nm thiab SMF feem ntau siv ntawm 1310, 1490, thiab 1550 nm (thiab, hauv WDM systems, hauv wavelengths nyob ib ncig ntawm cov thawj wavelengths).Cov thev naus laus zis tshiab tau txuas ntxiv qhov no mus rau 1625 nm rau SMF uas tau siv rau tiam tom ntej Passive Optical Networks (PON) rau FTTH (Fiber-To-The-Home).Silica-raws li iav yog pob tshab tshaj plaws ntawm cov wavelengths, thiab yog li ntawd qhov kev sib kis tau zoo dua (tsis muaj qhov txo qis ntawm cov teeb liab) hauv qhov ntau.Rau kev siv, pom lub teeb (lub teeb uas koj tuaj yeem pom) muaj wavelengths nyob rau hauv thaj tsam ntawm 400 thiab 700 nm.Feem ntau cov fiber ntau optic lub teeb ua haujlwm nyob rau hauv qhov ze infrared ntau yam (nruab nrab ntawm 750 thiab 2500 nm).Koj tsis tuaj yeem pom lub teeb infrared, tab sis nws yog lub teeb pom kev zoo fiber ntau.
Multimode fiber ntau yog 50/125 thiab 62.5/125 hauv kev tsim kho.Qhov no txhais tau hais tias cov tub ntxhais rau cladding txoj kab uas hla yog 50 microns rau 125 microns thiab 62.5 microns rau 125 microns.Muaj ntau ntau hom multimode fiber ntau thaj cable muaj hnub no, feem ntau yog multimode sc thaj cable fiber ntau, LC, ST, FC, ect.
Tswv yim: Feem ntau cov tsoos fiber optic lub teeb qhov chaw tsuas yog ua haujlwm nyob rau hauv qhov pom wavelength spectrum thiab dhau ntawm ntau lub wavelengths, tsis yog ntawm ib lub wavelength tshwj xeeb.Lasers (lub teeb amplification los ntawm stimulated emissions ntawm hluav taws xob) thiab LEDs tsim lub teeb nyob rau hauv ib tug ntau txwv, txawm ib tug wavelength, spectrum.
CEEB TOOM: Laser lub teeb ci siv nrog fiber ntau optic cables (xws li OM3 cables) yog qhov tsis zoo rau koj lub zeem muag.Saib ncaj qha mus rau qhov kawg ntawm cov khoom siv kho qhov muag nyob yuav ua rau muaj kev puas tsuaj loj rau koj cov retinas.Koj tuaj yeem ua rau dig muag mus tas li.Tsis txhob saib qhov kawg ntawm fiber ntau optic cable yam tsis tau paub ua ntej tias tsis muaj lub teeb pom kev zoo.
Lub attenuation ntawm optical fibers (ob leeg SMF thiab MMF) yog qis dua ntawm qhov ntev wavelengths.Yog li ntawd, kev sib txuas lus ntev ntev yuav tshwm sim ntawm 1310 thiab 1550 nm wavelengths tshaj SMF.Hom fiber ntau optical muaj qhov loj dua attenuation ntawm 1385 nm.Lub ncov dej no yog tshwm sim los ntawm qhov tsawg heev (hauv ib feem-ib lab) ntawm cov dej sib xyaw ua ke thaum lub sijhawm tsim khoom.Tshwj xeeb nws yog lub davhlau ya nyob twg -OH (hydroxyl) molecule uas tshwm sim rau nws cov yam ntxwv kev co ntawm 1385 nm wavelength;yog li no ua rau muaj kev cuam tshuam siab ntawm qhov wavelength.Keeb kwm, kev sib txuas lus ua haujlwm ntawm ob sab ntawm lub ncov no.
Thaum lub teeb pulses mus txog qhov chaw, lub sensor khaws qhov muaj lossis tsis muaj lub teeb liab thiab hloov cov pulses ntawm lub teeb rov qab rau hauv hluav taws xob teeb liab.Qhov ntau lub teeb liab tawg los yog confronts ciam teb, qhov ntau dua qhov teeb meem poob (attenuation).Tsis tas li ntawd, txhua qhov fiber ntau optic connector ntawm lub teeb liab qhov chaw thiab qhov chaw nthuav qhia qhov ua tau rau lub teeb liab poob.Yog li, cov connectors yuav tsum raug ntsia kom raug ntawm txhua qhov kev sib txuas.Muaj ntau ntau hom fiber ntau optic connectors muaj hnub no.Feem ntau yog: ST, SC, FC, MT-RJ thiab LC style connectors.Tag nrho cov hom kev txuas no tuaj yeem siv nrog ntau hom lossis ib hom fiber ntau.
Feem ntau LAN / WAN fiber ntau kis tau tus mob siv ib qho fiber ntau rau kev sib kis thiab ib qho rau kev txais tos.Txawm li cas los xij, thev naus laus zis tshiab tso cai rau fiber ntau optic transmitter xa mus rau ob qho kev qhia hla tib lub fiber ntau strand (piv txwv li, apassive cwjsiv WDM technology).Qhov sib txawv wavelengths ntawm lub teeb tsis cuam tshuam rau ib leeg vim cov detectors yog tuned tsuas yog nyeem cov wavelengths.Yog li ntawd, qhov ntau wavelengths koj xa mus rau ib tug tib strand ntawm optical fiber, qhov ntau detectors koj xav tau.
Post lub sij hawm: Sep-03-2021