Integration of microcavity‐based coherent light sources and waveguides is of central importance for building optical networks and photonic circuits. However, such combined devices face severe challenges in distributing the generated signals to designed ends despite that the significant advances are accomplished in emission modulation and controlling. Herein, dynamically all‐optical control of the outputs from the microcavity by employing parity‐time (PT) symmetry is demonstrated. By exploiting the interplay between gain and loss in a waveguide‐connected microsquare cavity, the mode field distributions can be strongly modified when the non‐Hermitian system enters PT‐symmetry breaking phase. Numerical calculations and the corresponding Husimi projections unambiguously show the PT‐symmetry‐induced mode localization and output redistributions in microsquare cavity. Notably, the intensity ratios of the lights collected by the two channels can be directly tuned over two orders of magnitude with the increase of pumping strength. These findings will be essential for understanding the fundamentals of non‐Hermitian optics and advancing the application potentials of microcavity system in integrated photonics.

中文翻译：

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通过奇偶时间对称性对微腔发射进行全光调制

基于微腔的相干光源和波导的集成对于构建光网络和光子电路至关重要。然而，尽管在发射调制和控制方面取得了重大进展，但是这种组合设备在将产生的信号分配到设计端时面临严峻挑战。在此，演示了通过采用奇偶时间（PT）对称性对微腔的输出进行动态全光控制的方法。通过利用波导连接的微型方腔中增益和损耗之间的相互作用，当非赫米特系统进入PT对称破坏阶段时，可以极大地修改模式场分布。数值计算和相应的Husimi投影清楚地显示了PT对称性引起的模式局部化和微方腔中的输出重新分布。值得注意的是，随着泵浦强度的增加，可以直接在两个数量级上调节由两个通道收集的光的强度比。这些发现对于理解非厄米特光学原理和提高微腔系统在集成光子学中的应用潜力至关重要。