Teko ea fiber optic core reflection e etsoa ke Optical Time Domain Reflectometer (OTDR). E leng sesebelisoa se sebelisetsoang ho lemoha ka nepo liphoso tsa sehokelo sa optical fiber ea marang-rang a puisano. OTDR e hlahisa pulse ka hare ho fiber ho lekoa bakeng sa liphoso kapa liphoso. Liketsahalo tse fapaneng ka har'a fiber li theha Rayleigh back scatter. Li-pulse li khutlisetsoa ho OTDR 'me matla a tsona a lekanngoa le ho baloa e le ts'ebetso ea nako' me a hlophisitsoe e le mosebetsi oa fiber stretch. Matla le pontšo e khutlisitsoeng e bolela ka sebaka le matla a phoso e teng. Ha se tlhokomelo feela, empa le lits'ebeletso tsa ho kenya mohala oa optical li sebelisa li-OTDR.

OTDR e thusa ho lekola botšepehi ba likhoele tsa fiber optic. E ka netefatsa tahlehelo ea splice, lekanya bolelele le ho fumana liphoso. OTDR e boetse e sebelisoa ka tloaelo ho etsa "setšoantšo" sa fiber optic cable ha e sa tsoa kenngoa. Hamorao, papiso e ka etsoa pakeng tsa mohlala oa pele le oa bobeli o nkuoeng haeba mathata a hlaha. Ho sekaseka trace ea OTDR kamehla ho nolofalloa ka ho ba le litokomane tse tsoang moleng oa mantlha o entsoeng ha thapo e kengoa. OTDR e u bontša moo likhoele li felisitsoeng le ho netefatsa boleng ba likhoele, likhokahano le likhoele. Litsela tsa OTDR li boetse li sebelisetsoa ho rarolla mathata, kaha li ka bonts'a moo likheo li leng teng ka har'a fiber ha mesaletsa e bapisoa le litokomane tsa ho kenya.

Jera tsoela pele teko ea FTTH theoha lik'hebole ka wavelengths (1310,1550 le 1625 nm). Re sebelisa EXFO FTB-1 litekong tsena tsa boleng. Ho hlahloba boleng ba lithapo tsa rona ho netefatsa hore moreki oa rona a ka fumana lihlahisoa tse fihlelang litlhoko tsa boleng.

Re etsa teko ena ho lithapo tsohle tseo re li hlahisang.
Laeborari ea rona ea kahare e khona ho etsa letoto le joalo la liteko tsa mofuta o tloaelehileng.
Rea u amohela ho ikopanya le rona bakeng sa lintlha tse ling.