Recent work [1–4] has demonstrated spontaneous breaking of clockwise-counterclockwise symmetry in a bidirectionally-pumped passive optical microresonator, mediated by the Kerr effect. The critical point of this symmetry breaking exhibits universal behaviours such as sensitivity enhancement and critical slowing down, which make it useful for sensing applications such as microresonator-based optical gyroscopes [5,6].

© 2019 IEEE

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