Time filter

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Palaiseau, France

Linget H.,University Paris - Sud | Chaneliere T.,University Paris - Sud | Le Gouet J.-L.,University Paris - Sud | Louchet-Chauvet A.,University Paris - Sud | Morvan L.,Thaies Research and Technology
2013 IEEE International Topical Meeting on Microwave Photonics, MWP 2013

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 105 larger than reached with km-long dispersive fibers, allowing us to extend the time-reversal process from the ns-range to the μs-range. © 2013 IEEE. Source

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