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It has been theoretically predicted in the 1980s that an optical ring resonator with Kerr nonlinearity that is pumped equally in both directions exhibits spontaneous symmetry breaking [1], in which light of a given frequency can only propagate in one direction. Just outside of the symmetry-broken regime the system exhibits enhanced sensitivity to rotation [2]. The symmetry breaking was realized for the first time earlier this year in high-Q optical microresonators [3], while microresonator gyroscopes in the linear regime have been recently demonstrated [4].
© 2017 IEEE
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