Kauj Ruam -index thiab graded-index yog ob qho tib si tsim qauv sib txawv ntawm ntau hom fiber ntau, thiab qhov sib txawv tseem ceeb tshaj li ntau tus neeg npaj lub network paub. Lub refractive index profile nyob rau hauv cov tub ntxhais fiber ntau txiav txim siab npaum li cas lub teeb propagates, ntau npaum li cas modal dispersion tshwm sim, thiab thaum kawg npaum li cas bandwidth ib tug multimode link yuav xa.
Hauv luv luv: graded -index multimode fiber ntau dominates niaj hnub thaj chaw thiab cov ntaub ntawv chaw cabling vim nws parabolic refractive index profile sharply txo cov mem tes dav. Kauj ruam-index multimode fiber ntau, ib zaug ib zaug, tam sim no txwv rau kev siv niche xws li cov khoom siv kho qhov muag (POF) cov neeg siv khoom txuas thiab qee qhov kev lag luam lossis kev kawm teeb tsa. Phau ntawv qhia no piav qhia yog vim li cas, nrog rau kev xa mus rau cov qauv kev lag luam thiab cov txheej txheem xaiv cov tswv yim.
Kauj ruam-Index vs Graded-Index Fiber ntawm ib saib
| Parameter | Kauj ruam -Index Multimode Fiber | Qib -Index Multimode Fiber |
|---|---|---|
| Refractive index profile | Uniform core; abrupt poob ntawm tub ntxhais - cladding ciam teb | Parabolic - siab tshaj ntawm qhov chaw, txo qis mus rau cladding |
| Txoj kev kaj | Zigzag reflections (tag nrho sab hauv kev xav) | Smooth, nkhaus sinusoidal paths (nruam refraction) |
| Modal dispersion | Siab - hom sib txawv tuaj txog ntawm lub sijhawm sib txawv | Ntau qhov qis dua - ceev them nyiaj sib npaug ntawm hom sijhawm tuaj txog |
| Hom bandwidth | ~ 20-100 MHz · km | 500–4700+ MHz·km (nyob ntawm chav kawm OM) |
| Core txoj kab uas hla | Nws txawv (POF ~ 1 mm; iav 50–62.5 µm keeb kwm) | 50 µm lossis 62.5 µm (tus qauv) |
| Cov qauv zoo sib xws | Tsis muaj tam sim no TIA OM xaiv rau kauj ruam -index iav fiber | OM1, OM2, OM3, OM4, OM5 (ib TIA-568.3 / ISO / IEC 11801) |
| Thawj siv niaj hnub no | POF cov neeg siv khoom siv audio / video txuas, kev qhia ua qauv qhia, qee qhov kev lag luam sensors | Enterprise LANs, lub hauv paus tsev kawm ntawv lub hauv paus, cov chaw zov me nyuam, cov txheej txheem cabling |
Kauj ruam -Index Multimode Fiber yog dab tsi?
Nyob rau hauv ib kauj ruam -index multimode fiber ntau, tag nrho cov tub ntxhais sib koom ib zaug xwb, zoo li refractive index. Nyob rau ntawm ciam teb ntawm cov tub ntxhais thiab cladding, qhov Performance index poob sharply - li no lub npe "step." Lub teeb nkag mus rau hauv cov tub ntxhais qhia tawm ntawm qhov ciam teb no hauv cov qauv zigzag, thaws los ntawm phab ntsa mus rau phab ntsa thaum nws taug kev raws cov fiber ntau.
Qhov teeb meem yog tias cov teeb pom kev sib txawv nkag mus rau ntawm cov ces kaum sib txawv, yog li lawv ua raws li txoj hauv kev sib txawv. Ib txoj kab hluav taws xob taug kev ze li ncaj nraim ntawm lub axis npog tsawg dua li ib qho bouncing ntawm lub kaum sab xis. Vim tias qhov ntsuas qhov ntsuas tsis zoo ib yam nyob rau txhua qhov chaw hauv lub hauv paus, txhua hom kev mus los ntawm tib qhov ceev - txhais tau tias qhov ntxhab - lub kaum sab xis tsuas siv sijhawm ntev dua los txog. Lub sijhawm ntawd kis tau ntawm cov hom ceev tshaj plaws thiab qeeb tshaj plaws yogmodal dispersion, thiab nws yog thawj bandwidth limiter nyob rau hauv tej multimode fiber ntau.
Raws li covFiber Optic Association (FOA), kauj ruam-index iav multimode fiber ntau tsis siv dav hauv kev sib txuas lus. Niaj hnub no, tsuas yog yas kho qhov muag fiber ntau (POF) thiab yas-clad silica (PCS/HCS) tseem siv cov kauj ruam-index tsim, feem ntau yog rau cov neeg siv luv luv suab lossis video txuas. Hauv kev siv lub network cabling, kauj ruam -index multimode fiber ntau tau hloov yuav luag tag nrho los ntawm qib-index designs.
Qhov twg kauj ruam-Index Fiber tseem tshwm sim
Los ntawm txoj kev xav tsim network, koj yuav tsis zoo li yuav ntsib cov kauj ruam -index multimode fiber ntau hauv qhov project cabling niaj hnub. Tab sis nws tsis tau ploj tag nrho. Cov xwm txheej uas cov kauj ruam -index kuj tseem muaj feem cuam tshuam suav nrog:
- Cov chav qhia qhia qhia pom cov qauv kev nthuav dav multimode thiab cov teebmeem cuam tshuam rau modal
- POF-raws li luv- kev sib txuas deb hauv cov neeg siv khoom siv hluav taws xob, tsheb hauv- tsheb sib txuas, lossis lub tshuab suab hauv tsev
- Qee cov ntawv thov kev paub txog kev lag luam uas cov qauv fiber ntau yooj yim thiab cov tub ntxhais loj dua yog qhov ua tau zoo
- Cov cuab yeej cuab tam qub uas tseem tsis tau hloov kho dua tshiab
Yog tias koj ua haujlwm nrogiav tiv thaiv yas optical fiber, nws pab kom nkag siab tias POF yog kauj ruam -index los ntawm xwm, thaum zoo li txhua lub iav multimode fiber ntau muag rau kev sib tham niaj hnub no siv cov qhab nia -index profile.
Dab tsi yog Qib -Index Multimode Fiber?
Qib -index multimode fiber ntau siv txoj hauv kev sib txawv. Hloov chaw ntawm cov tub ntxhais sib xws, qhov ntsuas qhov cuam tshuam siab tshaj plaws ntawm qhov chaw thiab txo qis qis dua - feem ntau tom qab ze ntawm - parabolic nkhaus - mus rau cladding. Lub International Telecommunication Union cais hom fiber ntau hauv qab noITU-T G.651.1.
Qhov no parabolic profile hloov lub physics ntawm lub teeb propagation nyob rau hauv ib tug tseem ceeb txoj kev. Tsis yog bouncing nyob rau hauv ntse zigzag reflections, lub teeb rays ua raws li tus nkhaus txoj kev mus rau lub hauv paus. Ib hom uas taug kev deb ntawm qhov chaw - npog ib txoj kev ntev ntawm lub cev - txav mus los ntawm cov cheeb tsam ntawm qhov qis dua qhov taw qhia, qhov twg nws mus sai dua. Lub caij no, qhov ze ntawm -axial hom npog qhov luv luv tab sis txav mus los ntawm qhov siab dua -index center ntawm qeeb qeeb. Qhov tshwm sim yog tias cov qauv sib txawv tuaj txog ntawm qhov kawg ntawm fiber ntau ze ua ke hauv lub sijhawm.
Qhov kev them nyiaj ceev no yog vim li cas qib -index fiber ntau muaj tsawg dua modal dispersion dua qib -index fiber. Hauv txoj kev xav, qhov profile parabolic zoo kawg nkaus tuaj yeem txo qhov cuam tshuam ntawm intermodal los ntawm ib qho ntawm kwv yees li 1,000 piv rau qib -index. Nyob rau hauv tiag tiag-kev tsim khoom hauv ntiaj teb, kev txhim kho bandwidth txog 100 zaug dhau ntawm kauj ruam-index tau ua tiav tsis tu ncua - txaus los txhawb ntau-gigabit Ethernet ntau pua meters.
Vim li cas Qib -Index yog tus qauv rau niaj hnub Multimode Networking
Txhua qhov kev faib tawm OM tam sim no ntawm multimode fiber ntau - OM1, OM2, OM3, OM4, thiab OM5 - yog raws li qib -index core tsim. Cov npe OM, txhais hauvANSI/TIA-568.3 thiab ISO/IEC 11801, qhia qhov tsawg kawg nkaus modal bandwidth yuav tsum tau uas tsuas yog qib -index profiles tuaj yeem ua tau raws li. Piv txwv li:
- OM 3(50/125 µm, laser{2}}optimized): ua tau zoo modal bandwidth ntawm 2000 MHz ·km ntawm 850 nm, txhawb 10 Gigabit Ethernet mus txog 300 m
- OM 4(50/125 µm, laser{2}}optimized): ua tau zoo modal bandwidth ntawm 4700 MHz ·km ntawm 850 nm, txhawb 10 Gigabit Ethernet mus txog 550 m
- OM 5(50/125 µm, wideband): txuas OM4 specification los txhawb luv-wavelength division multiplexing (SWDM) hla 850–953 nm
Rau cov ncauj lus kom ntxaws sib piv ntawm qhov txwv qhov deb thiab cov ntaub ntawv tus nqi thoob plaws txhua pawg OM, saib peb phau ntawv qhiaOM1-OM5 multimode fiber ntau nrug txwv.
Cov laus OM1 (62.5 / 125 µm) thiab OM2 (50/125 µm) kev faib tawm tau tsim los rau cov teeb pom kev zoo ntawm LED. Raws li qhov kev hloov kho tshiab kawg ntawm TIA tus qauv (ANSI/TIA-568.3-E), OM1 thiab OM2 tau raug tsiv mus rau ib lub koom haum yawg thiab tsis pom zoo rau kev teeb tsa tshiab. Cov kev xa tawm niaj hnub no dhau los qhia meej OM3 lossis OM4 laser-optimized graded-index fiber ua ke nrog 850 nm VCSEL transceivers.
Cov Ntsiab Sib txawv tau piav qhia
Refractive Index Profile
Qhov no yog qhov sib txawv hauv paus. Kauj Ruam - Performance index fiber muaj lub tiaj tus, tsis sib xws refractive index hla lub hauv paus nrog ib tug ntse ciam teb. Qib-index fiber ntau muaj qhov sib txawv tsis tu ncua - qhov siab tshaj plaws ntawm qhov chaw, txo qis sab nraud nyob ze - cov duab parabolic. Txhua yam ua raws li qhov sib txawv ntawm cov qauv no.
Modal Dispersion thiab Bandwidth
Hauv kauj ruam -index multimode fiber ntau, modal dispersion txwv kev siv bandwidth rau kwv yees li 20–100 MHz·km. Qhov ntawd txwv tsis pub siv cov ntaub ntawv tus nqi thiab nyob deb heev. Hauv qib -index multimode fiber ntau, parabolic profile sib npaug lub sij hawm mus txawv tebchaws, thawb bandwidth mus rau thaj tsam ntawm 500 MHz·km (OM2) txog 4700 MHz·km (OM4) thiab tshaj. Qhov no yog vim li cas qib -index fiber ntau tuaj yeem nqa 10 Gbps, 40 Gbps, lossis txawm tias 100 Gbps Ethernet tsheb hla qhov muaj txiaj ntsig zoo - ib yam dab tsi ib kauj ruam -index multimode fiber tsuas ua tsis tau.
Lub teeb nthuav dav
Kauj ruam-index fiber ua discrete zigzag bounces. Qib- Performance index fiber ua rau txoj kev nkhaus txuas ntxiv uas zoo li sine waves - ib qho yooj yim dua, tswj ntau hom kev nthuav tawm uas txo cov mem tes dav dua tib qhov txuas ntev.
Kev siv tswv yim
Hauv kev txiav txim siab ntawm cable tiag tiag, qhov no tsis yog kev sib tw ze. Yog tias koj tab tom qhia txog fiber ntau rau kev lag luam LAN, cov pob txha hauv tsev kawm ntawv, cov ntaub ntawv chaw sib cuam tshuam, lossis ib txoj haujlwm cabling uas tsim los rau tam sim no los yog tom ntej no - tiam Ethernet speeds, graded -index multimode fiber yog qhov kev xaiv loj multimode xwb. Kauj Ruam -index multimode fiber ntau ua rau lub luag haujlwm nqaim - POF cov neeg siv khoom sib txuas, kev qhia ua qauv qhia, thiab qee qhov kev paub txog kev lag luam - tsis muaj qhov sib tshooj nrog cov txheej txheem sib txuas.
Qhov no cuam tshuam li cas rau OM1, OM2, OM3, OM4, thiab OM5 Fiber
Ib qho ntsiab lus tsis meej pem: "step-index vs graded-index" thiab "OM1 vs OM3 vs OM4" zoo li sib tham sib txawv, tab sis lawv txuas nrog.
Txhua OM-chav kawm multimode fibers siv graded-index core profiles. Tus lej OM tsis piav qhia txog qib -index vs graded-index - hloov, nws txawv ntawm qhov sib txawvqibntawm qib - Performance index, feem ntau yog los ntawm lawv cov modal bandwidth thiab lub teeb qhov chaw uas lawv tau optimized rau.
Txoj kev loj hlob zoo li no:
- OM 1(62.5/125 µm): qib ntxov -index tsim rau LED qhov chaw; overfilled tso tawm bandwidth ntawm 200 MHz ·km ntawm 850 nm. Tam sim no yawg.
- OM 2(50/125 µm): txhim kho qib -index rau LED qhov chaw; overfilled tso tawm bandwidth ntawm 500 MHz ·km ntawm 850 nm. Kuj yawg.
- OM 3(50/125 µm): thawj lub laser- kho kom zoo dua qib-index tsim, nrog nruj tswj kev ntsuas qhov ntsuas qhov profile tau tsim tshwj xeeb rau 850 nm VCSEL tso tawm cov xwm txheej.
- OM 4: ntxiv refined graded -index profile ua tiav 4700 MHz ·km zoo modal bandwidth - ntau dua ob npaug OM3.
- OM 5: ntxiv qhov muaj peev xwm dav dav (850–953 nm) luv luv -wavelength division multiplexing, ua rau ntawm OM4-chav kawm graded-index core.
Yog li thaum ib tug neeg nug seb "OM3 fiber ntau yog qib-index" - yog, nws yog. Yog li yog OM1, OM2, OM4, thiab OM5. Cov kauj ruam-index vs graded-index distinction piavvim li casniaj hnub multimode fiber ntau ua haujlwm zoo li nws ua; qhov kev faib OM qhia rau kojzoo li casib qho tshwj xeeb qib -index fiber ua tau zoo.
To taub qhov twgSFP transceiver moduleua khub nrog txhua chav OM yog ib qho tseem ceeb xws li xaiv qhov zoo fiber ntau - mismatched optics thiab fiber ntau yuav txwv kev txuas txuas tsis hais qib cable.
Bandwidth thiab nrug: Cov kev cuam tshuam
Lub bandwidth- cov khoom nyob deb ( ntsuas hauv MHz·km) yog txoj hauv kev ncaj qha tshaj plaws los sib piv cov khoom siv fiber ntau. Nws qhia koj ntau npaum li cas cov ntaub ntawv tus nqi fiber ntau ntev tuaj yeem txhawb nqa ua ntej modal dispersion degrades lub teeb liab.
Rau cov kauj ruam -index multimode fiber ntau, bandwidth- cov khoom nyob deb yog feem ntau nyob rau hauv thaj tsam ntawm 20–100 MHz·km. Qhov ntawd txhais tau hais tias ntawm 1 km, koj tuaj yeem txhawb nqa tsuas yog 20–100 MHz ntawm analog bandwidth - deb dhau rau qhov siab tam sim no -tus qauv Ethernet ceev.
Rau graded -index multimode fiber ntau, cov lej muaj ntau dua. OM4 fiber ntau nrog 4700 MHz·km ntawm 850 nm tuaj yeem txhawb 10GBASE-SR txog 550 meters, lossis 40GBASE-SR4 thiab 100GBASE-SR4 txog 150 meters siv MPO / MTP parallel optics. Cov kev ncua deb no npog feem ntau ntawm - lub tsev thiab cov ntaub ntawv txuas qhov ntev.
Hauv cov ntsiab lus siv tau, kev xaiv ntawm kauj ruam -index thiab graded-index multimode fiber ntau tsis yog ib qho kev sib pauv bandwidth - nws yog ib lo lus nug ntawm seb qhov kev ua haujlwm multimode puas yog txawm nyob rau hauv ntau yam siv tau rau koj daim ntawv thov. Rau cov Ethernet txuas niaj hnub no, tsuas yog qib -index mus txog qhov ntau.
Yog tias koj qhov txuas txuas mus dhau qhov OM3 lossis OM4 multimode tuaj yeem npog, cov kauj ruam tom ntej feem ntau tsis yog kauj ruam -index lossis qib sib txawv multimode - nws tab tom tsiv mus rautib - hom fiber ntau, uas tshem tawm modal dispersion nkaus los ntawm kev txhawb nqa tsuas yog ib hom propagation.
Yuav Ua Li Cas Xaiv Txoj Cai Fiber rau Koj Qhov Haujlwm
Qhia meej qhov koj tab tom ua tiag tiag
Yog hais tias qhov project yog ib tug niaj hnub LAN, lub tsev kawm ntawv qaum teb, los yog cov ntaub ntawv chaw interconnect tsim rau 1 Gbps thiab siab dua, graded -index multimode fiber (OM3 los yog OM4) yog tus qauv pib taw tes. Kauj ruam-index multimode fiber tsis nkag mus rau kev sib tham rau cov ntawv thov no.
Yog tias qhov project yog cov neeg siv khoom sib txuas, ib qho kev kawm fiber ntau optics lab, lossis daim ntawv thov tshwj xeeb sensor, kauj ruam -index (feem ntau POF) yuav tsim nyog.
Match Fiber Qib kom txuas cov kev xav tau
Thaum koj tau tsim qhov qhab nia -index yog qhov tsim nyog, qhov kev txiav txim siab tiag tiag yog qhov twg OM chav kawm haum rau koj qhov kev xav tau bandwidth thiab deb. OM3 ua haujlwm zoo rau feem ntau khiav qis dua 300 meters ntawm 10 Gbps. OM4 txuas ntxiv uas ncav cuag thiab muab ntau lub taub hau rau kev hloov kho kom nrawm dua yav tom ntej. OM5 tsim nyog ntsuas yog tias koj npaj yuav siv SWDM-raws li transceivers rau 100G + dhau duplex fiber ntau.
Nyob rau hauv tus qauv TIA tam sim no, OM1 thiab OM2 yog yawm txiv - txhais tau tias lawv tseem raug lees paub tab sis tsis pom zoo rau cov tsheb thauj khoom ntsuab tshiab. Yog tias koj tab tom tsim cov nroj tsuag tshiab, qhia OM3 lossis siab dua kom tsis txhob muaj kev puas tsuaj thaum ntxov.
Xav txog qhov txuas tag nrho, Tsis yog Fiber xwb
Kev xaiv fiber ntau yog ib feem ntawm kev tsim txuas loj dua.Hom Connector, transceiver compatibility, splice poob, khoov vojvoog, thiabinsertion loss piv rau rov poobtxhua yam cuam tshuam seb qhov txuas tau raws li nws cov peev nyiaj ua haujlwm. Xaiv OM4 fiber ntau tab sis siv cov kev sib txuas tsis zoo lossis tsis sib haum ntawm optics yuav tsis xa cov txiaj ntsig xav tau.
Paub Thaum Yuav Tsiv Tshaj Tawm Multimode
Yog tias koj qhov kev ncua deb tshaj li 500-600 meters, lossis koj yuav tsum tau txhawb nqa 10G + nrawm dua kev khiav ntev dua, ntau hom fiber ntau (txawm OM4) yuav tsis txaus. Thaum lub sijhawm ntawd, ib leeg - hom fiber ntau nrog qhov tsim nyogtransceivers los yog transpondersfeem ntau yog qhov kev nqis peev zoo dua. Cov kauj ruam -index vs graded-index lo lus nug yuav tsis cuam tshuam thaum koj tsiv mus rau ib leeg- hom, uas siv nws tus kheej fiber ntau designs (OS1 and OS2).
Feem ntau yuam kev hauv qhov kev sib piv no
Tsis meej pem Qhov no nrog Tib -Mode vs Multimode
Kauj Ruam -index vs graded-index piav qhia txog yuav ua li cas cov refractive index faib nyob rau hauv lub hauv paus. Tib -hom vs multimode piav qhia txog pes tsawg hom kev nthuav tawm cov fiber ntau txhawb. Cov no muaj feem cuam tshuam tab sis nyias lub tswv yim. Tib hom - hom fiber ntau feem ntau siv cov kauj ruam -index profile nrog cov tub ntxhais me me (nyob ib ncig ntawm 8-10 µm) uas tso cai rau ib hom nkaus xwb - lub hom phiaj tsim qauv sib txawv dua li multimode fiber ntau ntawm ob hom.
Piv txwv tias tag nrho Multimode Fiber ua qhov sib npaug
Qhov tseeb tias tag nrho cov tam sim no OM-chav kawm fibers siv graded-index tsis txhais hais tias lawv yog interchangeable. Ib qho OM1 fiber ntau (200 MHz·km overfilled bandwidth) thiab OM4 fiber ntau (4700 MHz·km zoo modal bandwidth) txawv enormously hauv kev ua tau zoo. Qhov tseeb ntawm qhov qhab nia -index profile - nws sib npaug npaum li cas rau qhov zoo tagnrho parabola, nws zoo npaum li cas rau VCSEL tso tawm - cais OM3/OM4/OM5 los ntawm cov tiam dhau los.
Tsis quav ntsej txog kev tsim kho Cable thiab kev xaiv qhov txuas
Xaiv cov qib fiber ntau yog qhov tsim nyog tab sis tsis txaus. Txawm koj sivxoob- raj los yog nruj- buffered cable, qhov zoo ntawm kojpatch kabthiab kev txiav tawm, thiab ua tib zoo npaum li cas koj tswj lub vojvoog khoov thiab rub nro txhua qhov cuam tshuam tiag tiag -kev sib txuas hauv ntiaj teb.
Puas yog Kauj Ruam -Index Fiber Obsolete?
Tsis yog tag nrho - tab sis rau kev sib txuas hauv network tseem ceeb, nws yog qhov zoo ntawm daim duab. FOA sau tseg tias cov kauj ruam -index iav multimode fiber ntau tsis yog siv tseem ceeb rau kev sib txuas lus. Qhov twg cov kauj ruam - Performance index tsis nyob twj ywm yog nyob rau hauv yas optical fiber (POF) rau cov neeg siv khoom los yog tsheb luv luv txuas, thiab nyob rau hauv ib co tshwj xeeb muaj daim ntawv thov. Cov no yog siv tau, tab sis lawv tsis cuam tshuam nrog kev lag luam lossis cov ntaub ntawv chaw sib tham.
Yog tias koj ntsib cov kauj ruam -index multimode fiber ntau hauv kev teeb tsa uas twb muaj lawm, nws yuav luag txhua qhov chaw qub qub. Feem ntau, kev kho dua tshiab rau OM3 lossis OM4 qib-index fiber ntau raws li ib feem ntawm cov txheej txheem cabling refresh yuav xa cov bandwidth zoo dua, kev txhawb nqa ntev dua, thiab kev sib raug zoo nrog cov khoom siv tam sim no thiab tom ntej - tiam network.
Cov lus nug nquag
Puas yog qib -index fiber zoo dua li qib-index fiber rau kev sib txuas?
Rau txhua daim ntawv thov kev sib tham niaj hnub no - enterprise LAN, campus cabling, data center interconnects - graded-index multimode fiber is far superior. Nws muab cov kev faib tawm qis qis qis dua thiab ntau dua bandwidth. Kauj ruam-index multimode fiber ntau tsis nyob rau tam sim no siab -ceev Ethernet qauv.
Puas yog kauj ruam-index fiber tseem siv niaj hnub no?
Yog, tab sis hauv cov ntsiab lus nqaim. Yas kho qhov muag fiber ntau (POF) siv cov kauj ruam -index tsim thiab pom nyob rau hauv cov neeg siv cov suab / video txuas thiab qee lub tsheb hauv - tsheb sib txuas. Kauj ruam-index iav multimode fiber ntau yog tsis tshua muaj sab nraud ntawm cov cuab yeej cuab tam thiab kev qhia ntawv.
Puas yog ib qho -hom fiber ntau kauj ruam-index lossis qib-index?
Standard ib hom - hom fiber ntau (xws li G.652.D) siv ib kauj ruam -index profile, tab sis nrog ib tug tub ntxhais txoj kab uas hla ntawm li 8–10 µm - me me txaus los txhawb ib hom propagation nkaus xwb. Qhov no yog qhov txawv ntawm kauj ruam -indexmultimodefiber ntau, uas muaj cov tub ntxhais loj dua thiab txhawb nqa ntau pua hom nrog kev sib cais siab.
Puas yog OM3 thiab OM4 fibers muab qhab nia -index?
Yog lawm. Txhua OM-chav kawm multimode fibers (OM1 txog OM5) siv graded-index core designs. OM3 thiab OM4 tau tsim tshwj xeeb nrog kev tswj nruj parabolic profiles optimized rau 850 nm VCSEL laser qhov chaw, uas yog vim li cas lawv ua tau zoo modal bandwidth.
Dab tsi yog bandwidth - cov khoom nyob deb, thiab vim li cas nws tseem ceeb?
Bandwidth- cov khoom nyob deb (hauv MHz·km) qhia tias lub teeb liab bandwidth ntau npaum li cas ntawm fiber ntau tuaj yeem nqa tau dhau qhov kev ncua deb ua ntej modal dispersion degrades kev ua tau zoo. Kauj ruam-index multimode fiber ntau tus nqi ntawm 20–100 MHz·km; qib-index OM4 fiber ntau ncav cuag 4700 MHz·km - qhov sib txawv ntawm kwv yees li 50 txog 200 npaug.
Qhov twg zoo dua rau luv luv - nrug LAN: kauj ruam-index lossis qib-index?
Qib -index, tsis muaj lus nug. Txawm hais tias luv luv hauv - lub tsev khiav, cov khoom siv LAN niaj hnub siv VCSEL-raws li transceivers tsim rau OM3 lossis OM4 qib-index fiber. Kauj ruam-index iav multimode fiber ntau tsis sib xws nrog cov optics hauv txhua qhov kev xav tau.
Thaum twg kuv yuav tsum hla qhov kev sib piv no tag nrho thiab xaiv ib hom -?
Yog tias koj qhov kev sib txuas deb tshaj li 500-600 meters, yog tias koj xav tau kev txhawb nqa 10G + nrawm ntawm qhov ntev dua, lossis yog tias koj xav tau qhov siab tshaj plaws yav tom ntej scalability yam tsis muaj kev hloov kho fiber ntau, ib qho - hom fiber ntau yog qhov kev xaiv tsim nyog. Cov kauj ruam-index vs graded-index lo lus nug tsuas yog siv nyob rau hauv qeb multimode.
Kev xav zaum kawg
Cov kauj ruam -index vs graded-index distinction yog tsim nyog nkag siab vim hais tias nws piav txog lub physics qab multimode fiber ntau. Cov qhab-nees -index parabolic profile them nyiaj rau ntau hom kev mus txawv tebchaws, uas txo cov modal dispersion, uas ua rau siab dua bandwidth - thiab cov saw ntawm qhov ua rau thiab cov nyhuv yog vim li cas txhua txhua OM tam sim no -chav kawm multimode fiber ntau yog graded-index.
Rau leej twg hais txog fiber ntau rau qhov project network tiag tiag, cov tswv yim coj mus ua ncaj nraim. Kauj ruam-index multimode fiber ntau belongs rau yav dhau los era ntawm fiber optics thiab ib tug nqaim txheej tam sim no niche daim ntaub ntawv. Qib -index multimode fiber ntau - tshwj xeeb yog OM3 lossis OM4 - yog qhov kev xaiv tus qauv rau cov chaw niaj hnub, tsev kawm ntawv, thiab cov ntaub ntawv chaw cabling. Thiab thaum multimode mus txog nws qhov deb lossis ceev txwv, txoj hauv kev rau pem hauv ntej yog -hom, tsis yog qhov sib txawv multimode.
Ua ntej ua tiav txhua qhov kev xaiv fiber ntau, txheeb xyuas tag nrho cov peev nyiaj txuas: qib fiber ntau,connector hom, transceiver compatibility, nyob deb, thiab npaj kev hloov kho ceev. Lub fiber nws tus kheej tsuas yog ib qho ntawm cov kab ke uas yuav tsum tau ua haujlwm ua ke.
