Otdr speavve tsom xam yog ib qho tseem ceeb ntawm fiber ntau kuaj. Los ntawm kev txheeb xyuas lub otdr nkhaus, qhov zoo thiab ua tau zoo ntawm cov fiber tuaj yeem nkag siab. Cov hauv qab no yog cov lus qhia ntxaws ntxaws ntawm cov ntsiab lus tseem ceeb, lawv cov laj thawj txawv txawv, thiab lawv cov kev sib cav sib ceg:
Cov tswv yim tseem ceeb ntawm otdr nkhaus:
OTDr (Optical lub sijhawm ua raws li kev nkhaus) plots ib qho nkhaus los ntawm kev xa tawm cov pulsical optical fiber thiab ntsuas cov teeb meem kho tshiab. Txhua lub ntsiab lus ntawm txoj kev nkhaus sawv cev rau kev siv kho qhov muag ntawm lub fiber ntawm cov haujlwm sib txawv. Los ntawm kev txheeb xyuas cov kab nkhaus, teeb meem xws li fiber ntau poob, tawg, thiab kev sib txuas zoo tuaj yeem kuaj pom.
Cov kab nkhaus txawv txawv thiab lawv cov laj thawj thiab cov khoom cuav
Tsis muaj Fresnel Reflection Peak nyob rau thaum xaus ntawm lub qhov muag fiber ntau:
Vim li cas:Lub fiber kawg nto yog qias neeg lossis tsis zoo.
Countermeasure:Huv lub fiber kawg lub ntsej muag lossis rov qab lub ntsej muag kawg.
Lub nkhaus yog cov armin tau qhia meej, nrog kev ua kom loj heev uas yog qhov loj dhau los yog me me
Vim li cas:Ntau txoj kev ua yuam kev (tsawg dua ob zaug qhov ntev ntawm cov ntsuas fiber ntau).
Countermeasure: nce cov ntau.
Muaj ib lub roob me me 'me me siab' nyob hauv nruab nrab ntawm txoj kev nkhaus:
Vim li cas:Vim yog qhov zoo ntawm cov fiber ntau (cov kab nrib pleb me me) lossis kev xav ntawm cov nthwv dej thib ib ntawm lub ntsej muag kawg.
Kev Countermeasure: Hloov cov ntsuas ntsuas fiber ntau thiab cov mem tes dav, rov qab lub ntsej muag kawg, thiab rov ua dua. Yog tias 'me me roob' ploj mus 'ploj, nws yog ib qho kev xav tau theem siab ntawm Wave; Yog tias nws tsis ploj, nws yog qhov teeb meem zoo nrog cov fiber nws tus kheej.
Qhov nce tseem ceeb yog tsim tawm ntawm Fiber Optic Connectors, Couplings, thiab Fusion Cov Ntsiab Lus:
Vim li cas:Mismatch ntawm hom teb txoj kab.
Countermeasure:Con Bidirectional kuaj rau kev ua raws thiab kev sib koom ua ke, thiab coj tus nqi nruab nrab.
Txoj kab nqes ntawm nkhaus yog qhov qub, tab sis cov detenuation coefficients ntawm ob xaus ntawm cov fiber yogNtshai ntau txawv:
Vim li cas:Untreven hom teb, feem ntau nyob rau hauv cov fiber ntau kos lub taub hau thiab tw ntu.
Countermeasure:Con Bidirectional kuaj rau kev ua raws thiab coj tus nqi nruab nrab.
Qhov kev ua raws li tag nrho cov fiber ntau, tab sis muaj kev nyuaj siab me me ntawm sab xub ntiagKUB KAWG REFRECTION PE >>
Vim li cas:Lub fiber ntau optic cable qhov kawg ntawm ob peb metres lossis kaum tawm ntawm meters yog raug rau daim ntawv sab laug.
Countermeasure:Rov ua qhov kev soj ntsuam kom pom yog tias muaj kev hloov pauv.
Qhov nkhaus ntawm 1310nm fiber yog du, tab sis qhov delenuation txoj kab nqes ntawm 1550nm fiber ntau ntxiv:
Vim li cas:Qhov ntev tshaj plaws hauv sab hauv lub raj raj yog luv heev, ua rau cov fiber ntau yam kom ncav cuag.
Countermeasure:Paub meej tias qhov seem tshuav hauv qab cov raj raj thiab nce ntxiv qhov ntev hauv cov raj raj.