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A Telecom-Based Temporal Cloak

Joseph M. Lukens, Daniel E. Leaird, Andrew M. Weiner

Published Jan 1, 2013• 0 citations
Publisher

Abstract

We demonstrate a new temporal cloak capable of hiding 46% of the entire time axis at a repetition rate of 12.7 GHz. Our results introduce temporal cloaking into the practical domain of secure optical communication.
DOI
10.1364/cleo_qels.2013.qm4e.4

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Recent research on time cloaking has revealed a fascinating approach to hide temporal events from an interrogating optical field, by opening up and subsequently closing intensity gaps in a probe beam. Experiments thus far have demonstrated temporal cloaking of nonlinear interactions and high-speed optical data. Here we report a temporal cloak with the new capability not only to hide optical data, but also to concurrently transmit it along another wavelength channel for subsequent readout, masking the information from one observer while directing it to another. Additionally, the cloak succeeds in passing modulated data unscathed through a scrambling event, providing a new form of tampering resistance. Both examples launch a paradigm shift in temporal cloaking: instead of using time cloaks primarily to disrupt communication, we show how they can also improve data transmission, in turn greatly widening the range of possible applications in telecommunications.
The pursuit of invisibility cloaks has long been a central theme in science fiction literature. One approach involves altering the waveform transmitted to the observer in the spatial domain, represented by meta-materials. Another approach is to open a window in the time domain. Specifically, researchers for the first time opened a single or periodic time gap in the probe light sent to the observer, thereby hiding an event within this time gap [Nature481, 62 (2012)10.1038/nature10695]. However, the absence of an optical carrier in the opened window prevented the recovery of the hidden event even for the cooperator. Now, we have demonstrated a novel temporal cloak that can recover hidden events. In this temporal cloak, the opening and closing of time gaps are achieved through the precise manipulation of photon density and phase synchronization in the injection-locked laser. During the process, the inevitable spontaneous emission photons are utilized to carry the event information. The cloaking window demonstrates both flexibility and reconfigurability, with its size achieving a breakthrough extension to 2.5 µs compared with dispersion-based methods. These advancements represent a significant step towards the realization of time cloaking and have a direct impact on secure communication.