Analog time-reversal of optically-carried RF signals with a rare earth ion-doped processor with broadband potential

We propose a novel analog architecture for time-reversing optically carried RF signals, based on a rare-earth atomic processor. Our scheme combines long processed signals duration (>10 mu s), potentially GHz bandwidth, direct access to the signal field amplitude, and compatibility with phase-modulated signals. The combination of these features makes this architecture ideal for refocusing RF signals distorted by their propagation in a reverberating environment.