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High sensitivity rotation sensing based on tunable asymmetrical double-ring structure

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Abstract

A very high sensitivity rotation sensor comprising a tunable asymmetrical double-ring structure (TADRS) coupled by a 3 × 3 coupler is presented. The phase difference caused by the TADRS between the counter-propagating waves is derived and discussed. At the resonant frequency, the phase shift difference has the maximum value when the light power in one cavity is amplified about 1.85 times while attenuated 79% in another. The maximum sensitivity of the TADRS sensor is two times larger than that of a single-ring structure. An experimental system is designed to verify the theoretical results and introduce the method of demodulation. The rotation sensor based on TADRS can enhance the sensitivity of the detection of the angular velocity by more than three orders of magnitude.

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Acknowledgements

This research is supported by the National Natural Science Foundation of China (NSFC) under Grant No. 61304252.

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Authors and Affiliations

  1. Department of Optoelectronic Information Science and Engineering, School of Science, Tianjin Polytechnic University, Tianjin, 300387, China

    Hong Gu & Xiaoqing Liu

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  1. Hong Gu
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  2. Xiaoqing Liu
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Correspondence to Hong Gu.

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Gu, H., Liu, X. High sensitivity rotation sensing based on tunable asymmetrical double-ring structure. Appl. Phys. B 123, 155 (2017). https://doi.org/10.1007/s00340-017-6730-y

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