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i may modulate the signal and send a digital signal (pwm for example ), so the non-linearity is not a problem... actually what i need is simply an optocoupler, but the medium that carrys the light between the trnasmitter and the receiver is a fibreoptic ...
for isolation purposes, i need to transmit an analog signal optically, i know that there's photodiodes and phototransistors that can be connected using a fibre optic but i cant find any ..can any one give me a link to the datasheet of sush a thing ..