Time-reversal of μs-long radiofrequency signals based on approximate temporal imaging
Héloïse Linget, T. Chanelière, J.-L. Le Gouët +2 more
We propose a purely analog way to time reverse optically-carried radiofrequency signals. Taking advantage of the time-space duality, we implement an approximate temporal imaging device that combines a time-lens and a single dispersive line. For military applications, this dispersive element must offer a group delay dispersion high enough to time-reverse μs-long signals. We propose to use spectral hole burning to tailor the absorption profile of erbium ions embedded in a crystalline lattice of yttrium orthosilicate. This way, we achieve a group delay dispersion 105larger than reached with km-long dispersive fibers, allowing us to extend the time-reversal process from the ns-range to the μs-range.
International Topical Meeting on Microwave Photonics•Oct 1, 2013•1 citation