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Logic Gates Based on Interaction of Counterpropagating Light in Microresonators

Moroney, N; Del Bino, L; Woodley, M T M; Ghalanos, G N; Silver, J M; Svela, A O; Zhang, S; Del'Haye, P (2020) Logic Gates Based on Interaction of Counterpropagating Light in Microresonators. Journal of Lightwave Technology, 38 (6). pp. 1414-1419. ISSN 0733-8724

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Optical logic seeks to replace electronics with photonic circuits in applications for which optic-to-electronic conversion is impractical and for integrated all-optical circuits. Nonlinear optics in whispering gallery mode resonators provides low power, scalable methods to achieve optical logic. We demonstrate, for the first time, an all-optical, universal logic gate using counterpropagating light in which all signals have the same operating optical frequency. Such a device would make possible the routing of optical signals without the need for conversion into the electronic domain, thus reducing latency. The operating principle of the device is based on the Kerr interaction between counter-propagating beams in a whispering gallery mode resonator which induces a splitting between the resonance frequencies for the two propagating directions. Our gate uses a fused silica microrod resonator with a \textit{Q}-factor of $\SI{2e8}{}$. This method of optical logic gives a practical solution to the on-chip routing of light.

Item Type: Article
Keywords: Microresonators, optical logic, nonlinear optics, photonic circuits
Subjects: Time and Frequency > Microwave Frequency Standards
Divisions: Time & Frequency
Identification number/DOI: 10.1109/JLT.2020.2975119
Last Modified: 02 Jul 2020 13:09
URI: http://eprintspublications.npl.co.uk/id/eprint/8769

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