Idan aka ƙara ƙarfin lantarki a cikin lu'ulu'u na lantarki, ma'aunin haske da sauran halayen gani na lu'ulu'u suna canzawa, suna canza yanayin polarization na raƙuman haske, ta yadda hasken da ke zagaye ya zama hasken polarized mai siffar elliptical, sannan ya zama haske mai siffar elliptical ta hanyar polarizer, kuma ana daidaita ƙarfin hasken. A wannan lokacin, raƙuman haske suna ɗauke da bayanan sauti kuma suna yaɗuwa a cikin sarari kyauta. Ana amfani da na'urar gano haske don karɓar siginar gani da aka daidaita a wurin karɓa, sannan ana aiwatar da juyawar da'ira don canza siginar gani zuwa siginar lantarki. Ana dawo da siginar sauti ta hanyar demodulator, kuma a ƙarshe an kammala watsa siginar sauti. Ƙarfin wutar lantarki da aka yi amfani da shi shine siginar sauti da aka watsa, wanda zai iya zama fitowar na'urar rikodin rediyo ko na'urar tuƙi, kuma a zahiri siginar lantarki ce da ke canzawa akan lokaci.