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We provide an experimental demonstration of a direct fiber-optic link for RFtransmission ("radio-over-fiber") using a sensitive optical antenna based on arubidium vapor cell. The scheme relies on measuring the transmission of laserlight at an electromagnetically-induced transparency resonance that involveshighly-excited Rydberg states. By dressing pairs of Rydberg states usingmicrowave fields that act as local oscillators, we encoded RF signals in theoptical frequency domain. The light carrying the information is linked via avirtually lossless optical fiber to a photodetector where the signal isretrieved. We demonstrate a signal bandwidth in excess of 1 MHz limited by theavailable coupling laser power and optical density. Our sensitive, non-metallicand readily scalable optical antenna for microwaves allows extremely low-levelsof optical power ($\sim 1\, \mu$W) throughput in the fiber-optic link. Itoffers a promising future platform for emerging wireless networkinfrastructures.

Radio-over-fiber using an optical antenna based on Rydberg states of atoms