一、光纖測試儀的原理是什么

光纖測試儀是一(yi)種用于測量光(guang)纖網(wang)絡(luo)中光(guang)信(xin)號強度(du)、損(sun)耗和其他也(ye)關鍵參數(shu)的設備。它通過光(guang)源和光(guang)探頭(tou)將光(guang)信(xin)號發(fa)送和接收，并通過分析收到的信(xin)號來評估光(guang)纖網(wang)絡(luo)的性(xing)能。

光(guang)纖(xian)(xian)測(ce)(ce)試(shi)儀(yi)可以測(ce)(ce)量電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)，其原理是(shi)(shi)通(tong)過光(guang)纖(xian)(xian)技術將(jiang)被測(ce)(ce)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)點(dian)點(dian)位的(de)電(dian)(dian)(dian)(dian)(dian)(dian)信(xin)號轉換為(wei)光(guang)信(xin)號進行傳(chuan)輸(shu)，并利用(yong)光(guang)纖(xian)(xian)傳(chuan)輸(shu)特性測(ce)(ce)量電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值。具體來說，光(guang)纖(xian)(xian)測(ce)(ce)試(shi)儀(yi)通(tong)過一對電(dian)(dian)(dian)(dian)(dian)(dian)極將(jiang)電(dian)(dian)(dian)(dian)(dian)(dian)信(xin)號輸(shu)入到(dao)被測(ce)(ce)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)上，然后根(gen)據歐姆定(ding)律，電(dian)(dian)(dian)(dian)(dian)(dian)流值與電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值成正(zheng)比關系，即I=U/R，其中I為(wei)電(dian)(dian)(dian)(dian)(dian)(dian)流值，U為(wei)為(wei)電(dian)(dian)(dian)(dian)(dian)(dian)壓值，R為(wei)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值。然后，通(tong)過測(ce)(ce)量電(dian)(dian)(dian)(dian)(dian)(dian)流值和(he)電(dian)(dian)(dian)(dian)(dian)(dian)壓值就可以計算出電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值。主要是(shi)(shi)輸(shu)出固定(ding)的(de)光(guang)源信(xin)號，將(jiang)該(gai)信(xin)號通(tong)過光(guang)纖(xian)(xian)傳(chuan)輸(shu)到(dao)需要測(ce)(ce)試(shi)的(de)被測(ce)(ce)設備，并在傳(chuan)輸(shu)過程中測(ce)(ce)量光(guang)功率計接收到(dao)的(de)光(guang)信(xin)號功率大(da)小(xiao)。

二、光纖測試儀由什么構成

光纖測試儀是用于(yu)評(ping)估(gu)光纖傳輸(shu)性能的設(she)備，主要(yao)由(you)光源和(he)光功(gong)率計兩部分組成。

光(guang)(guang)(guang)(guang)源是產生(sheng)光(guang)(guang)(guang)(guang)信(xin)號的(de)(de)(de)裝置(zhi)，常用的(de)(de)(de)光(guang)(guang)(guang)(guang)源有(you)LED光(guang)(guang)(guang)(guang)源、激光(guang)(guang)(guang)(guang)光(guang)(guang)(guang)(guang)源、白熾(chi)燈光(guang)(guang)(guang)(guang)源等。不同的(de)(de)(de)光(guang)(guang)(guang)(guang)源產生(sheng)的(de)(de)(de)光(guang)(guang)(guang)(guang)信(xin)號波長和(he)功率有(you)所不同，根據具體測(ce)試的(de)(de)(de)需求(qiu)選擇相應的(de)(de)(de)光(guang)(guang)(guang)(guang)源。

光(guang)(guang)功率(lv)計(ji)是(shi)測(ce)試(shi)光(guang)(guang)信號功率(lv)大(da)小的(de)裝置。它通過(guo)接收被(bei)測(ce)試(shi)設備傳(chuan)輸過(guo)來的(de)光(guang)(guang)信號，并將其(qi)轉(zhuan)換(huan)成電信號進行測(ce)量，從而評估光(guang)(guang)纖傳(chuan)輸的(de)性能。光(guang)(guang)功率(lv)計(ji)常用(yong)的(de)結構是(shi)PIN衰減器(qi)結構，其(qi)優點(dian)是(shi)反應時(shi)間(jian)快，頻寬較高，精度(du)高。