Multimeter Application: Optical Fiber Test Parameters thiab Test Methods
Tom qab lub fiber optic cabling system tau teeb tsa, nws yog ib qho tsim nyog los ntsuas cov yam ntxwv ntawm kev sib kis ntawm qhov txuas. Cov khoom kuaj tseem ceeb tshaj plaws yog cov yam ntxwv attenuation ntawm qhov txuas, qhov ntxig qhov poob ntawm qhov txuas, thiab qhov rov qab poob. Hauv qab no peb piav qhia luv luv ntawm kev ntsuas qhov tseem ceeb ntawm lub cev tsis muaj fiber ntau optical cable thiab kev daws teeb meem thiab kev saib xyuas lub network.
1. Lub cev tseem ceeb ntawm kev sib txuas ntawm fiber ntau optical
attenuation:
1. Attenuation yog qhov txo qis ntawm lub hwj chim kho qhov muag thaum lub sij hawm kis tau tus mob ntawm lub teeb nyob rau hauv lub optical fiber.
2. Kev suav ntawm tag nrho cov attenuation ntawm lub optical fiber network: fiber ntau poob (LOS) yog hais txog qhov piv ntawm lub zog Powerout ntawm qhov kawg ntawm cov khoom siv fiber ntau rau lub zog Powerin thaum nws tawm mus rau hauv fiber ntau.
3. Qhov poob yog proportional rau qhov ntev ntawm fiber ntau, yog li tag nrho cov attenuation tsis tsuas yog qhia cov fiber ntau poob nws tus kheej, tab sis kuj qhia txog qhov ntev ntawm fiber.
4. Optical fiber ntau poob yam ( ): Yuav kom muaj kev cuam tshuam cov yam ntxwv ntawm optical fiber attenuation, peb qhia lub tswvyim ntawm optical fiber ntau poob.
5. Ntsuas qhov attenuation: Vim hais tias cov fiber ntau optical txuas nrog lub teeb ci thiab lub ntsuas hluav taws xob kho qhov muag yuav inevitably qhia txog kev poob ntxiv. Yog li ntawd, qhov kev teeb tsa ntawm qhov ntsuas qhov ntsuas ntawm tus ntsuas (uas yog, qhov chaw ntawm zeroing) yuav tsum tau ua ntej thaum kuaj ntawm qhov chaw. Muaj ntau txoj hauv kev rau kev sim cov ntsiab lus siv, uas feem ntau yog xaiv raws li cov khoom txuas mus kuaj. Nyob rau hauv lub optical fiber cable system, txij li qhov ntev ntawm cov fiber ntau optical nws tus kheej feem ntau tsis ntev, ntau xim yuav raug them rau kev sib txuas hauv txoj kev sim. Txoj kev tseem ceeb tshaj plaws ntawm tus tester thiab sim jumper.
Rov qab poob: Reflection poob tseem hu ua rov qab poob. Nws hais txog tus lej decibel ntawm qhov piv ntawm lub teeb retroreflected rau lub teeb pom kev ntawm qhov kev sib txuas ntawm fiber ntau optical. Qhov loj dua qhov rov qab poob, qhov zoo dua, txhawm rau txo qhov cuam tshuam ntawm kev cuam tshuam ntawm lub teeb ci ntawm lub teeb ci thiab qhov system. Kev cuam tshuam. Txoj hauv kev los txhim kho qhov rov qab poob yog sim ua cov txheej txheem kawg ntawm lub ntsej muag ntawm cov khoom siv kho qhov muag mus rau hauv ib lub voj voog lossis oblique spherical nto yog ib txoj hauv kev zoo los txhim kho qhov rov qab poob.
Insertion poob: Insertion poob yog hais txog qhov decibel piv ntawm cov zis hluav taws xob kho qhov muag mus rau lub zog hluav taws xob input tom qab cov teeb liab kho qhov muag hauv qhov muag fiber ntau dhau los ntawm cov khoom txuas. Qhov me me ntawm qhov ntxig poob, qhov zoo dua. Insertion poob yog ntsuas tib yam li attenuation.
2. Kev ntsuas thiab ntsuas cov khoom siv kho qhov muag fiber ntau
1. Optical fiber identifier
Nws yog ib tug rhiab heev photodetector. Thaum koj khoov cov fiber ntau, qee lub teeb tawm ntawm lub hauv paus. Cov teeb no raug kuaj pom los ntawm cov cim fiber ntau, thiab cov kws tshaj lij tuaj yeem txheeb xyuas cov tub ntxhais fiber ntau lossis ib tus neeg fibers hauv thaj panels los ntawm lwm cov fibers raws li cov teeb no. Optical fiber identifiers tuaj yeem kuaj xyuas lub xeev thiab kev taw qhia ntawm lub teeb yam tsis muaj kev cuam tshuam rau kev sib kis. Txhawm rau ua qhov no yooj yim dua, cov teeb liab ntsuas feem ntau yog hloov kho ntawm 270Hz, 1000Hz lossis 2000Hz ntawm lub transmitter thiab txhaj rau hauv ib qho fiber ntau. Feem ntau ntawm cov optical fiber identifiers yog siv rau ib hom optical fibers nrog ib tug ua hauj lwm wavelength ntawm 1310nm los yog 1550nm. Qhov zoo tshaj plaws optical fiber identifiers tuaj yeem siv macrobending technology los txheeb xyuas cov fiber ntau hauv online thiab kuaj cov kev taw qhia kis tau tus mob thiab lub zog hauv cov fiber ntau optical.
2. Fault locator (fault tracker)
Cov cuab yeej no yog ua raws li lub laser diode pom lub teeb (lub teeb liab) qhov chaw. Thaum lub teeb raug txhaj rau hauv cov fiber ntau, yog tias muaj qhov tsis zoo xws li fiber ntau tawg, kev sib txuas tsis ua haujlwm, kev khoov ntau dhau, vuam tsis zoo, thiab lwm yam, lub teeb tawm mus rau fiber ntau tuaj yeem siv los tswj cov fiber ntau. Faults tuaj yeem pom pom. Lub qhov muag pom kev txhaum qhov chaw xa tawm hauv nthwv dej (CW) lossis hom mem tes. Cov zaus zaus yog 1Hz lossis 2Hz, tab sis tuaj yeem ua haujlwm hauv kHz ntau. Lub zog tso zis ib txwm yog 0dBm (1Mw) lossis tsawg dua, qhov kev ua haujlwm deb yog 2 txog 5km, thiab txhawb nqa txhua qhov sib txuas.
3. Cov khoom siv kho qhov muag poob (tseem hu ua optical multimeter lossis optical power meter)
Txhawm rau ntsuas qhov poob ntawm qhov sib txuas ntawm fiber ntau, lub teeb calibrated tsis tu ncua yog pib ntawm ib kawg thiab lub zog tso zis tau nyeem ntawm qhov kawg tau txais.
Ob qho khoom siv no yog qhov ntsuas qhov muag tsis pom. Thaum lub teeb pom kev zoo thiab lub ntsuas hluav taws xob sib xyaw ua ke rau hauv cov cuab yeej siv, nws feem ntau hu ua optical poob tester (tseem hu ua optical multimeter). Thaum peb ntsuas qhov poob ntawm qhov txuas, ib tus neeg yuav tsum tau ua haujlwm qhov ntsuas lub teeb ntawm qhov kawg xa tawm thiab lwm tus neeg siv lub ntsuas hluav taws xob kho qhov muag los ntsuas qhov kawg tau txais, yog li tsuas yog tus nqi poob hauv ib qho kev taw qhia tuaj yeem tau txais.
Feem ntau, peb yuav tsum ntsuas qhov poob hauv ob qho kev qhia (vim tias muaj kev sib txuas lus tsis zoo lossis vim qhov tsis sib xws ntawm kev sib kis ntawm fiber ntau). Lub sijhawm no, cov kws tshaj lij yuav tsum sib pauv cov khoom siv nrog ib leeg thiab ntsuas kev ntsuas rau lwm qhov. Txawm li cas los xij, lawv yuav tsum ua li cas thaum lawv sib cais los ntawm ntau tshaj kaum tsev lossis kaum kilometers? Pom tseeb, yog tias ob tus neeg no txhua tus muaj lub teeb pom kev zoo thiab lub ntsuas hluav taws xob kho qhov muag, tom qab ntawd lawv tuaj yeem ntsuas tib lub sijhawm ntawm ob sab, cov khoom siv kho qhov muag tam sim no siv rau kev kuaj ntawv pov thawj tuaj yeem paub txog kev sim ob-kab ob-ntiv taw, xws li: Fluke's CertiFiber thiab FTA fiber optic kuaj cov khoom siv ntawm DSP cable xeem series.
