Pamene magetsi awonjezeredwa ku electro-optic crystal, refractive index ndi zina zomwe zimagwira ntchito pa kuwala kwa kristalo zimasintha, zimasintha momwe kuwala kozungulira komwe kumayendera kumakhala kuwala kozungulira komwe kumayendera kumakhala kuwala kozungulira komwe kumayendera, kenako kumakhala kuwala kozungulira komwe kumayendera kudzera mu polarizer, ndipo mphamvu ya kuwala imasinthidwa. Panthawiyi, kuwala kwa kuwala kumakhala ndi chidziwitso cha mawu ndipo kumafalikira m'malo omasuka. Photodetector imagwiritsidwa ntchito kulandira chizindikiro cha kuwala chomwe chimayendetsedwa pamalo olandirira, kenako kusintha kwa dera kumachitika kuti kusinthe chizindikiro cha kuwala kukhala chizindikiro chamagetsi. Chizindikiro cha mawu chimabwezeretsedwa ndi demodulator, ndipo pamapeto pake kutumiza kwa chizindikiro cha mawu kumatsirizidwa. Voltage yogwiritsidwa ntchito ndi chizindikiro cha mawu chotumizidwa, chomwe chingakhale chotulutsa cha wailesi kapena tepi drive, ndipo kwenikweni ndi chizindikiro cha voltage chomwe chimasinthasintha pakapita nthawi.