Kev Tshawb Pom, Kev Teeb Meem, thiab Kev Tswj Xyuas Cov Ntsiab Lus High-Attenuation hauv Optical Cables

Hauv kev tsim cov xov hluav taws xob optical, kev ua tau zoo ntawm kev txo qis yog qhov ntsuas tseem ceeb. Raws li cov xwm txheej ib txwm muaj, tsab xov xwm no tshuaj xyuas qhov chaw thiab cov txheej txheem kev tswj hwm ntawm cov ntsiab lus siab-attenuation hauv cov kab hluav taws xob optical.

I. Cov Chaw Feem Ntau Ntawm Cov Chaw Uas Muaj Kev Txom Nyem Siab

Tom qab ua tiav kev sib txuas ntawm cov xov hlau, kev sim OTDR feem ntau yog ua rau tag nrho ntu relay. Qhov kev sim no xyuas seb cov yam ntxwv kho qhov muag ntawm cov xov hlau sib txuas puas ua tau raws li cov qauv tsim kho thiab cov qauv lees txais. Kev ntsuam xyuas feem ntau suav nrog:

• Seb qhov tag nrho attenuation ntawm qhov relay seem qis dua qhov kev tsim qauv (piv txwv li, seb qhov nruab nrab attenuation coefficient ua tau raws li qhov yuav tsum tau ua)

• Seb qhov nruab nrab ntawm kev sib txuas ntawm cov pob qij txha puas ua tau raws li cov qauv kev lees txais thiab cov qauv tsim

• Seb qhov backscatter curve slope puas yog sib npaug thiab du, tsis muaj cov kauj ruam loj attenuation tsuas yog cov kauj ruam me me uas tshwm sim los ntawm kev poob splice ib txwm muaj

Thaum siv OTDR los sim qhov seem relay thiab nrhiav cov ntsiab lus siab-attenuation, nws yog ib qho tseem ceeb kom teeb tsa cov kev cai xws li ntau yam, wavelength, pulse width, refractive index, thiab averaging time kom raug:

• Kev sim ntau yam:Teem raws li qhov ntev ntawm ntu relay kom qhov nkhaus nyob li ntawm 2/3 ntawm qhov screen zaub

• Qhov ntev ntawm nthwv dej:Feem ntau 1310 nm thiab 1550 nm rau cov cables ntev

• Cov ntsuas kev cuam tshuam:Teem raws li cov lus qhia ntawm cov chaw tsim khoom fiber

• Qhov dav ntawm lub zog:Ib qho tseem ceeb uas yuav tsum tau ua—me dhau ua rau tsis txaus dynamic range thiab muaj suab nrov; loj dhau ua rau qhov ntsuas tsis raug. Yuav tsum xaiv nws raws li qhov deb thiab qhov tseeb.

• Lub sijhawm nruab nrab:Kho kom txog thaum tus tw nkhaus du yam tsis muaj suab nrov pom tseeb

Yuav kom nrhiav tau qhov chaw ua txhaum, siv tau OTDR analysis software. Feem ntau, cov teeb meem muaj ob pawg: splice-box faults thiab cable-body faults.

II. Kev Tswj Xyuas Cov Ntsiab Lus Uas Muaj Kev Txom Nyem Siab

Ua ntej, txiav txim siab seb qhov chaw siab-attenuation puas nyob ntawm qhov chaw sib txuas. Ntawm cov ntsiab lus sib txuas, txhua lub fibers feem ntau qhia cov kauj ruam attenuation ntawm ntau qib. Los ntawm kev tshuaj xyuas ntau cov kab fiber tib lub sijhawm, yog tias txhua cov kab qhia cov kauj ruam ntawm tib qho chaw, nws yuav yog qhov teeb meem sib txuas.

• Ntsuas thiab xam qhov kev poob ntawm ob txoj kev sib txuas ntawm qhov ntawd

• Sau cov nqi uas tshaj cov qauv

• Qhib qhov kaw ntawm qhov sib txuas thiab ua cov kev kho kom raug

Yog tias tsuas yog qee cov fibers qhia txog kev txo qis ntawm qhov chaw thaum lwm tus tsis ua, qhov teeb meem yuav tsis yog qhov sib txuas tab sis qhov txhaum hauv lub cev cable.

Cov Txheej Txheem Qhov Chaw Ua Txhaum Cai

• Cov kev ua yuam kev ze-kawg:Siv OTDR los ntawm lub davhlau ya nyob twg los ntsuas qhov deb ntawm qhov chaw sib txuas ze tshaj plaws

• Cov kev ua yuam kev deb kawg:Vim yog qhov tseeb txo qis dua qhov deb ntev, sim los ntawm qhov kaw splice ze ze xwb.

• Ua ke cov ntaub ntawv OTDR nrog cov ntaub ntawv tsim kho thiab cov ntaub ntawv slack

• Ua kev ntsuas hauv thaj teb kom pom qhov txhaum hauv thaj tsam li 10 meters

Txoj kev no txo ​​qhov kev khawb av, txo cov nqi, thiab luv lub sijhawm kho.

Cov Kev Kho

1. Cov Qhov Tsis Zoo ntawm Splice-Point

• Qhib qhov kaw splice thiab rov ua dua cov fibers

• Saib xyuas lub sijhawm tiag tiag siv OTDR kom txog thaum cov qib poob uas tau txais tau raug ua tiav

Yog tias rov ua dua splicing tsis ua tiav:

• Tshawb xyuas seb puas muaj kev hloov pauv ntawm cov raj fiber buffer

• Xyuas kom meej tias lub vojvoog khoov kom raug thaum lub sijhawm coiling fiber

• Tshawb xyuas qhov kev sib txuas ntawm cov fiber

Yog tias muaj teeb meem, tshuaj xyuas cov ntu ntawm cov xov hlau ua ntej thiab tom qab txuas. Yog tias xav tias muaj kev puas tsuaj, txiav rov qab thiab rov txuas tag nrho cov xov hlau.

2. Cov Kev Ua Txhaum Cai ntawm Lub Cev Cable

Cov ua rau muaj xws li:

• Kev sib txhuam los yog kev co ntawm lub cable

• Kev puas tsuaj sab nraud (piv txwv li, kev nyuaj siab los ntawm pob zeb ua rau deformation)

• Kev hloov pauv ntawm lub raj buffer ua rau muaj kev sib txuas ntawm cov fiber

Kev daws teeb meem:

• Txiav qhov seem uas puas lawm thiab rov txuas dua

• Rau kev puas tsuaj loj heev, nruab ib qho kev sib txuas thiab kho cov fibers cuam tshuam

• Yog tias tsim nyog, tshem cov ntaub thaiv sab nraud thiab kho lossis hloov cov raj buffer puas lawm

Kev Tiv Thaiv

• Tshawb xyuas qhov ntev ntawm cov xov hlau seem ua ntej txuas

• Txiav qhov ntev ntxiv ntawm cov xov hlau uas muaj qhov txawv txav kom tsis txhob muaj kev puas tsuaj zais cia

• Tso qhov chaw tsis muaj zog txaus kom yooj yim kho yav tom ntej

Cov Kev Cai Rau Kev Xeem

Cov neeg ua haujlwm kuaj yuav tsum sib koom tes nrog cov kws tshaj lij hauv thaj chaw thiab ua cov kev xeem OTDR ntawm cov theem hauv qab no:

1. Tom qab splicing tiav lawm

2. Tom qab fiber coiling tiav lawm

3. Tom qab sealing ntawm lub splice

Tsuas yog tom qab paub tseeb tias cov teeb meem attenuation tau daws lawm ces pab neeg yuav tsum tawm ntawm qhov chaw.