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Appl Opt. 2007 Jul 1;46(19):4125-31.

Rotation sensing based on a slow-light resonating structure with high group dispersion.

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  • 1National Laboratory on Local Fiber-Optic Communication Networks and Advanced Optical Communication Systems, School of Electrical Engineering and Computer Science, Peking University, Peking, China.


The concept of the Sagnac effect in a slow-light medium and resonator structure with a high group dispersion is investigated. It is found that a slow-light medium can be utilized for relative motion sensing, and a slow-light resonator structure is suitable to detect absolute rotation for navigation purposes. It is noted that the high group dispersion leads to a huge enhancement of the rotation sensor's sensitivity in a resonating structure, and an approach to evaluate and design resonator devices with slow-light property is proposed. Moreover, a folded loop-lattice-based structure is numerically simulated to verify the concept.

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