Txuj ci

Tib hom thiab Multimode Fiber yog dab tsi?

Qhov tseem ceeb sib txawv hauvfiber ntau optickev sib txuas lus nyob rau hauv li cas optical signals propagate.Ib hom fiber ntautso cai rau lub teeb pom kev mus rau hauv ib hom kev raws txoj kev ncaj nraim los ntawm fiber ntau qhov chaw, thaummultimode fiber ntautxhawb nqa ntau lub teeb teeb xa mus ib txhij ntawm cov ces kaum sib txawv los ntawm refraction hauv fiber ntau.

Ib hom fiber ntau optic cablesmuaj ib tug tub ntxhais txoj kab uas hla ntawm tsuas yog 9 microns - sib npaug rau ib tug -feem kaum lub thickness ntawm ib tug tib neeg cov plaub hau. Cov kab teeb pom kev yuav luag tsis muaj kev cuam tshuam hauv, nthuav tawm raws txoj kev ncaj. Qhov kev tsim no txo ​​cov teeb liab distortion, ua rau nws zoo tagnrho rau kev xa mus ntev - deb.Multimode fiber ntau optic cableNws muaj ib txoj kab uas hla ntawm 50 microns los yog 62.5 microns. Cov tub ntxhais thicker txhais tau tias ntau txoj kev teeb pom kev tuaj yeem ua haujlwm ib txhij. Thaum qhov no ua rau qee qhov kev hloov pauv hloov pauv, kev ua haujlwm tseem zoo nyob rau hauv luv luv - daim ntawv thov nyob deb.
 

Qhov tseem ceeb sib txawv ntawm Ib hom thiab Multimode Fiber

Core lojyog qhov pom tseeb tshaj plawsqhov sib txawv ntawm ib hom thiab multimodefiber ntau. Covib hom fiber ntauqhov loj ntawm 9 microns xav tau siab heev precision rau lub teeb qhov chaw thiab connectors, thaum lubmultimode optical fiber ntau50/62.5 micron core muab kev muaj zog "lub teeb sib sau ua ke," txo cov kev xav tau rau kev sib tw precision. Qhov no yog vim li casmultimode fiber ntauyog nrov nyob rau hauv ib puag ncig zoo li cov chaw zov me nyuam cov ntaub ntawv uas yuav tsum tau hloov kho cov hlua txuas ntxiv.

Hais txog lub teeb ci thiab wavelengths,ib hom fiber ntau wavelengthsFeem ntau siv 1310nm lossis 1550nm laser qhov chaw, kev sib xyaw ua ke uas muab kev sib kis ntau dua.Multimode fiber ntausiv850nm lossis 1300nm wavelengths, ua ke nrog LED lossis VCSEL lub teeb ci. VCSEL raug nqi qis dua li lasers, uas yog vim li cas tseem ceebmultimodesystems muaj cov nqi pib nqis peev tsawg dua.

Dispersion yog qhov tseem ceeb cuam tshuam rau kev ua haujlwm ntawm kev sib kis. Hauvmultimode fiber ntau optics, lub teeb beams mus txawv tebchaws tuaj txog ntawm qhov kawg tau txais ntawm lub sijhawm sib txawv. Qhov no modal dispersion ua rau lub teeb liab distortion, txwv kev sib kis deb. Feem ntau,multimode fiber ntaukev ua tau zoo degrades noticeably tshaj 300-500 meters.Ib hom optical fiber ntauzam teeb meem modal dispersion vim tias tsuas muaj ib txoj kev teeb pom kev zoo xwb, yooj yim ua tiav kev sib kis ntawm ob peb mais lossis txawm kaum mais.

Kev sib kis nrug thiab ceev

Cov qib sib txawv ntawm fiber ntau qhia qhov sib txawv ntawm qhov sib txawv ntawm ntau qhov ceev.Tib homOS2 fiber ntau tuaj yeem txhawb nqa 10-kilometer kis tau tus mob hla txhua qib ceev ntawm 1Gb txog 100Gb. Qhov kev sib xws no ua rau nws yog thawj qhov kev xaiv rau cov ntawv thov nyob deb.

Multimode fiber ntaukev ua tau zoo yog ze rau kev ceev. Hauv 1Gb Ethernet daim ntawv thov, txhua qib ntawmmultimode fiber ntaulos ntawm OM1 txog OM5 tuaj yeem txhawb nqa 550-meter nrug. Txawm li cas los xij, thaum ceev nce mus rau 10Gb, OM1 thiab OM2 tuaj yeem ua tsis tau raws li qhov yuav tsum tau ua ntxiv lawm - tsuas yog OM3 thiab OM4 tuaj yeem txhawb nqa 300 meters thiab 400 meters raws. Hauv cov ntawv thov ceev tshaj 25Gb,multimode fiber ntau nrugtxo qis ntxiv. OM3 tsuas tuaj yeem txhawb nqa 70-100 meters, OM4 tuaj yeem ncav cuag 100-150 meters, thaum qhov tseeb OM5 tuaj yeem txhawb nqa 400 meters hauv 100Gb daim ntawv thov.

Txawm tiasmultimode fiber ntauyog txwv, nyob rau hauv luv luv - nyob deb scenarios zoo li cov ntaub ntawv center interiors, 300-400 meter nrug yog kiag li txaus. Rau cov tsev kawm ntawv hauv tsev kawm ntawv uas xav tau kev sib txuas hauv tsev sib txuas lossis ntev dua,ib hom fiber ntauyog qhov kev xaiv xwb.

Kev Ntsuas Tus Nqi

Thaum tham txog cov nqi, ntau tus neeg thawj zaug xav txog tus nqi cable nws tus kheej. Hauv kev muaj tiag,ib hom kab mobfeem ntau yog 20-30% pheej yig dua li qib siabMultimode fiber ntau optic cables(xws li OM4) vim muaj cov txheej txheem tsim khoom lag luam. Tus nqi sib txawv tiag tiag yog nyob rau hauv optical modules.

Noj 1Gb ceev ua piv txwv, tus nqi sib txawv ntawmib homthiabmultimodeSFP modules yog tsawg, ntawm kwv yees li $ 10 thiab $ 9 feem. Txawm li cas los xij, raws li kev ceev nce, qhov khoob pib tshwm sim . 10Gbib homSFP + modules raug nqi txog $ 27, thaummultimodeversions tsuas xav tau $20. Rau 100Gb QSFP28,ib hommodules raug nqi siab li $499, thaummultimodeversions tsuas yog $99 - qhov txawv ntawm $400.

Los ntawm kev xav txog tus nqi, kev hloov kho yav tom ntej yuav tsum tau txiav txim siab. Yog xaivmultimode fiber ntau, koj tuaj yeem paub txog kev hloov kho dua tshiab los ntawm OM1 rau OM3, tom qab ntawd mus rau OM4, nrog rau txhua qhov kev hloov kho tshiab yuav tsum muaj cov cabling tshiab thiab cov nqi zog ntau ntxiv. Xaivib hom fiber ntautso cai rau ib qho - lub sij hawm xa tawm ntawm OS2, nrog rau qhov kev nrawm nrawm ntxiv uas yuav tsum tau hloov kho qhov kho qhov muag nkaus xwb yam tsis tau hloov cov txheej txheem lub cev.

Rau luv luv- tej yaam num lossis pob nyiaj siv - cov xwm txheej txwv,multimode fiber ntauqis module nqi kom zoo dua yog pom tseeb. Txawm li cas los xij, rau lub sijhawm ntev - kev npaj tsim kho, txawm tiasib hom fiber ntaumuaj ntau dua qhov pib kho qhov muag module peev, nws zam kev rov tsim kho thiab kev lag luam ntau dua nyob rau lub sijhawm ntev.

Kev sib haum xeeb

Tib hom thiab multimode fiber ntautsis tuaj yeem sib xyaw kiag li - qhov no yog txoj cai hlau hauv network engineering. Qhov laj thawj yog nyob rau hauv qhov sib txawv loj heev hauv cov tub ntxhais loj. Thaum lub 9-micron coreib hom fiber ntautxuas mus rau 50-micron coremultimode fiber ntau, nws tsim 10-20dB kho qhov muag poob, txaus los ua kom tiav qhov txuas tsis ua haujlwm. Hloov pauv,multimode fiber ntautxuas rauib hom fiber ntautseem yuav ua tsis tau kom pom cov teeb pom kev zoo vim yog tus lej aperture mismatch.

Hauv kev teeb tsa tiag tiag, koj tuaj yeem paub qhov txawv ntawm lub tshoxim. Raws li TIA-598C cov qauv,ib hom fiber ntau ximyog lub tsho daj, thaummultimode fiber ntausiv lub tsho txiv kab ntxwv los yog aqua. Ntawm cov khoom faib khoom hauv chav tsev, hom fiber ntau yuav tsum tau sau kom meej meej thiab cais lub cev kom tsis txhob muaj qhov yuam kev -insertion.

Txawm li cas los xij, muaj xwm txheej tshwj xeeb. Siv hom txias thaj qaum, 1000BASE-LXib homSFP modules tuaj yeem ua haujlwm raumultimode fiber ntau. Tsis tas li ntawd, los ntawm fiber ntau media converters, bridging ntawmib homthiabmultimodeCov ntu hauv lub network tuaj yeem ua tau, tab sis qhov no ntxiv cov khoom siv ntxiv thiab cov ntsiab lus tsis ua haujlwm. Feem ntau, cov kev daws teeb meem no tsis pom zoo.

Yuav xaiv li cas?

Thaum xaiv ntawmib hom lossis multimode fiber ntau, qhov kev ntsuas tseem ceeb tshaj plaws yog kis tau tus mob nrug. Yog hais tias koj daim ntawv thov scenario kis deb tshaj 1 km,ib hom fiber ntauyog qhov kev xaiv nkaus xwb, suav nrog cov chaw hauv tsev kawm ntawv, thaj chaw hauv nroog loj, thiab cov xwm txheej zoo sib xws.

Rau luv- daim ntawv thov nyob deb li cov ntaub ntawv chaw sab hauv thiab cov chaw ua haujlwm hauv tsev, yog tias kis tau tus mob nyob hauv 300 meters,multimode fiber ntauyog qhov kev xaiv pheej yig dua. OM3 lub OM4multimode fiber ntauua ke nrog VCSEL optical modules tuaj yeem muab 300-400 meter kis tau tus mob ntawm 10Gb nrawm, ua tiav raws li cov khoom siv feem ntau xav tau. Ntxiv mus,multimodeoptical modules yog pheej yig dua, txo cov nqi hauv siab -cov cabling ceev.

Rau 5G network fronthaul seem, vim qhov xav tau qis -latency kis tau tus mob ntawm 25Gb eCPRI cov cim nrog kev sib kis feem ntau hla ntau mais,ib hom fiber ntauyog tus qauv configuration. Hauv kev lag luam network, sivmultimode fiber ntaurau pem teb nkag thiabib hom fiber ntaurau inter-kev tsim cov caj qaum yog ib qho kev sib xyaw ua ke thiab kev siv nyiaj txiag.

FAQ

LC, SC, MPO/MTP - yuav xaiv li cas?

1G/10G ib leeg -core bidirectional: Common LC-LC (feem ntau)

40G / 100G SR4 (parallelmultimode): Feem ntau sivMPO/MTP

100G LR4 (ib homWDM): Feem ntau siv LC

Qhov twg zoo dua - ib hom lossis multimode fiber ntau?
Tib hom fiber ntau thiab multimode fiber ntautxhua tus muaj qhov zoo ntawm cov nqi thiab kev siv. Tsuas yog xaiv qhov tsim nyog tshaj plaws raws li koj qhov kev thov yuav tsum tau ua.

Multimode puas tuaj yeem siv tib hom modules? Ib hom tuaj yeem siv multimode modules?
Feem ntau tsis tuaj yeem sib xyaw:

SR (multimode) modules: Yuav tsum tau OM fiber ntau (850nm), feem ntau tsis ua hauj lwm rau specification ntawm OS2

LR/ER (ib hom) modules: Yuav tsum tau OS2 (1310/1550nm), tej zaum yuav muaj kev poob / dispersion / reflection ua rau instability los yog tsis -ua raws li OM fiber