Kana voltage yawedzerwa ku electro-optic crystal, refractive index nezvimwe zvinhu zve optical zve crystal zvinochinja, zvinochinja polarization state ye light wave, kuitira kuti denderedzwa polarized light rive elliptically polarized light, uye robva rava linearly polarized light kuburikidza ne polarizer, uye light intensity inogadziriswa. Panguva ino, light wave rine ruzivo rweruzha uye rinopararira munzvimbo yakasununguka. Photodetector inoshandiswa kugamuchira modulated optical signal panzvimbo yekugamuchira, uye ipapo circuit conversion inoitwa kushandura optical signal kuita electrical signal. Sound signal inodzoserwa ne demodulator, uye pakupedzisira optical transmission yesound signal inopedzwa. Applied voltage ndiyo transmission sound signal, iyo inogona kuva output ye radio recorder kana tape drive, uye chaizvoizvo chiratidzo che voltage chinoshanduka nekufamba kwenguva.