Based on space-time duality and through the use of temporal dispersive delay lines, this paper presents a demonstration of temporal cloaking/uncloaking at microwave frequencies. Numerical simulations of pulse generation, continuous wave signal recovery and data recovery are discussed in relation to the proposed system architecture. This paper also suggests a practical means for implementation of real time dual temporal cloaking/uncloaking. Compared to traditional signal processing systems, since the recovered data emerges with a reversed form in time domain before its final decoding, an extra operation named time-reversal is needed to obtain the correct data, which could help protect the significant signals better with the proposed temporal cloaking/uncloaking system. The proposed method and achieved results indicate potential application in secure communications and data multiplexing subject to channel bandwidth requirements.
2. Fridman, M., A. Farsi, Y. Okawachi, and L. A. Gaeta, "Demonstration of temporal cloaking," Nature, Vol. 481, 62-65, 2012.
3. Kolner, B., "Space-time duality and the theory of temporal imaging," IEEE Journal of Quantum Electronics, Vol. 30, 1951-1963, 1994.
4. Azana, J. and M. A. Muriel, "Temporal self-imaging effects: theory and application for multiplying pulse repetition rates," IEEE Journal of Selected Topics in Quantum Electronics, Vol. 7, 728-744, 2001.
5. Berger, N. K., B. Levit, A. Bekker, and B. Fischer, "Compression of periodic optical pulses using temporal fractional Talbot effect," IEEE Photonics Technology Letters, Vol. 16, 1855-1857, 2004.
6. Lukens, J. M., D. E. Leaird, and A. M. Weiner, "A temporal cloak at telecommunication data rate," Nature, Vol. 498, 205-208, 2013.
7. Kolner, B. H. and M. Nazarathy, "Temporal imaging with a time lens," Opt. Lett., Vol. 14, 630-632, 1989.
8. Bennett, C. V. and B. Kolner, "Principles of parametric temporal imaging. I. System configurations," IEEE Journal of Quantum Electronics, Vol. 36, 430-437, 2000.
9. Bennett, C. V. and B. Kolner, "Principles of parametric temporal imaging. I. System performance," IEEE Journal of Quantum Electronics, Vol. 36, 649-655, 2000.
10. Salem, R., M. A. Foster, A. C. Turner, D. F. Geraghty, M. Lipson, and A. L. Gaeta, "Optical time lens based on four-wave mixing on a silicon chip," Opt. Lett., Vol. 33, 1047-1049, 2008.
11. Foster, M. A., R. Salem, D. F. Geraghty, A. C. Turner-Foster, M. Lipson, and A. L. Gaeta, "Silicon-chip-based ultrafast optical oscilloscope," Nature, Vol. 456, 81-84, 2008.
12. Foster, M. A., R. Salem, Y. Okawachi, A. C. Turner-Foster, M. Lipson, and A. L. Gaeta, "Ultrafast waveform compression using a time-domain telescope," Nature Photonics, Vol. 3, 581-585, 2009.
13. Lerosey, G., J. De Rosny, A. Tourin, A. Derode, G. Montaldo, and M. Fink, "Time reversal of electromagnetic waves," Physics Review Letters, Vol. 92, 193904(1-3), 2009.
14. Lee, T. H., Planar Microwave Engineering: A Practical Guide to Theory, Measurement, and Circuits, Cambridge University Press, 2004.
15. Abielmona, S., S. Gupta, and C. Caloz, "Compressive receiver using a CRLH-based dispersive delay line for analog signal processing," IEEE Transactions on Microwave Theory and Techniques, Vol. 57, 2617-2626, 2009.
16. Gupta, S., A. Parsa, E. Perret, R. V. Snyder, R. J. Wenzel, and C. Caloz, "Group-delay engineered noncommensurate transmission line all-pass network for analog signal processing," IEEE Transactions on Microwave Theory and Techniques, Vol. 58, 2392-2407, 2010.
17. Messer, H., H. Gilboa, and Y. Bar-Ness, "SAW time scaling techniques," IEEE Transactions on Sonics and Ultrasonics, Vol. 28, 271-277, 1981.
18. Papoulis, A., Signal Analysis, McGraw-Hill Press, New York, 1978.
19. Ardehali, M., "Narrow pulse generator,", US 7782111 B2 (patent), 2010.
20. Laso, M. A., et al., "Real-time spectrum analysis in microstrip technology," IEEE Transactions on Microwave Theory and Techniques, Vol. 51, 705-717, 2003.