You might look at video fiber optic transmitter/receiver. I used one once to carry a certain telemetry signal for the same reasons your are looking for. The fiber optics were analog in this case and rated from 30 hz to 10 Mhz at 1 volt P-P. We had to attenuate the signal going into the transmitter and we had to amplify the receiver. Our run was around 400 feet. The signal to noise ratio was somewhere around 55 db.
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