Kev txhais lus OTDR (Optical Time Domain Reflectometer) daim ntawv qhia txog kev tshuaj xyuas cov kab uas nws tsim kom nkag siab txog cov yam ntxwv thiab cov xwm txheej ntawm qhov txuas fiber ntau optical. Nov yog yuav ua li cas nyeem cov ntaub ntawv feem ntau pom nyob rau hauv daim ntawv ntsuam xyuas OTDR:
1. Txoj kab nkhaus:
Cov kab nkhaus sawv cev rau qhov kho qhov muag fiber ntau hauv kev sim. X-axis qhia qhov kev ncua deb ntawm OTDR ntsuas, thiab y-axis sawv cev rau lub zog kho qhov muag hauv dB (decibels). Ib qho kev txo qis hauv lub zog raws txoj kab qhia tau hais tias fiber ntau attenuation, thaum muaj kev hloov pauv tam sim ntawd lossis cov xwm txheej zoo li splices lossis cov khoom sib txuas tuaj yeem pom tau tias yog qhov siab tshaj lossis poob rau hauv kab.
2. Attenuation:
Txoj kab nqes ntawm txoj kab nruab nrab ntawm cov xwm txheej qhia tias fiber ntau attenuation. Ib txoj kab nqes siab txhais tau tias siab dua attenuation. OTDRs calibrate qhov no hauv dB / km, qhia ntau npaum li cas cov teeb liab poob ib kilometer ntawm fiber ntau.
3. Txheej xwm:
Txhua qhov kev hloov pauv tseem ceeb hauv kab, xws li splices, connectors, lossis so, yog hu ua cov xwm txheej. Cov no tuaj yeem txheeb xyuas tau los ntawm kev hloov pauv ntawm txoj kab nqes lossis qhov siab tshaj plaws hauv kab. Qhov loj ntawm qhov kev tshwm sim qhia qhov poob ntawm qhov chaw, nrog rau cov xwm txheej loj dua feem ntau cuam tshuam rau kev poob siab dua.
4. Reflectance:
Reflectance yog tus nqi ntawm lub teeb rov qab mus rau OTDR los ntawm cov xwm txheej zoo li cov khoom sib txuas lossis cov khoom sib txuas. Lub siab reflectance ncov qhia tau hais tias muaj kev cuam tshuam tseem ceeb, uas tuaj yeem ua rau lub teeb liab degradation yog tias nws siab dhau lawm.
5. Tuag Zone:
Nyob ze ntawm lub cuab yeej OTDR, muaj thaj chaw uas qhov ntsuas pulse overloads lub receiver, tsim kom muaj "zoned tuag" qhov xwm txheej tsis tuaj yeem ntsuas qhov tseeb. Cov cheeb tsam no feem ntau yog ob peb meters mus rau kaum ntawm meters los ntawm OTDR.
6. Suab nrov:
Lub suab nrov hauv OTDR kab tuaj yeem tshwm sim los ntawm ntau yam, suav nrog qhov zoo ntawm cov fiber ntau, qhov ntsuas pulse dav, thiab cov neeg txais kev xav tau. Lub suab nrov dhau tuaj yeem ua rau nws nyuaj rau kev txheeb xyuas cov xwm txheej kom raug.
7. Cov cim thiab ntsuas:
OTDRs tso cai rau koj tso cov cim rau ntawm kab los ntsuas qee ntu ntawm fiber ntau. Koj tuaj yeem ntsuas qhov kev ncua deb ntawm cov cim, qhov poob ntawm ib qho chaw tshwj xeeb, thiab qhov attenuation coefficient ntawm fiber ntau dhau qhov kev ncua deb.
8. Wavelength thiab Index ntawm Refraction:
OTDRs feem ntau ua haujlwm ntawm qhov sib txawv wavelengths (piv txwv li, 1310 nm thiab 1550 nm). Qhov Performance index ntawm refraction teeb tsa pab OTDR xam qhov deb kom raug los ntawm kev suav rau qhov ceev ntawm lub teeb hauv fiber ntau.
9. Qhov nruab nrab:
OTDRs tuaj yeem siv ntau yam kev ntsuas thiab nruab nrab kom txo cov suab nrov thiab txhim kho qhov tseeb ntawm kab. Ntau qhov nruab nrab ua rau muaj qhov huv dua tab sis siv sijhawm ntev dua kom tau txais.
10. Pulse Dav:
Qhov dav ntawm qhov ntsuas pulse cuam tshuam rau kev lag luam tawm ntawm kev ntsuas qhov deb thiab kev daws teeb meem. Cov pulses dav dua nkag mus rau hauv cov fiber ntau tab sis muab kev daws teeb meem qis dua, thaum cov pulses nqaim muab kev daws teeb meem siab dua tab sis tsis tuaj yeem ncav cuag deb.
Kev nkag siab txog cov ntsiab lus ntawm OTDR daim ntawv ntsuam xyuas yuav pab kuaj cov teeb meem nrog fiber ntau optic cables, ntsuas qhov zoo ntawm kev teeb tsa, thiab tswj kev ncaj ncees ntawm fiber optic tes hauj lwm.