Synchronization and frequency locking between remote mechanical oscillators are of scientific and technological importance. The key challenges are to align the oscillation frequencies and realize strong nonlinear interaction of both oscillators to a common carrier capable of long-distance transmission. Here, we experimentally realize the all-optical synchronization between two different optomechanical systems, a microsphere and a microdisk. The mechanical oscillation of the microsphere induced by the radiation pressure is loaded onto the pump laser via the optomechanical interaction, which is directly transmitted through a 5-km-long single-mode fiber to excite the mechanical oscillation of the microdisk. By finely tuning both the optical and mechanical frequencies of the two microresonators, the oscillation of the microdisk is injection locked to the microsphere, resulting in a synchronized phase relation of the two systems. Our results push a step forward the long-distance synchronization network using optomechanical microresonators.

中文翻译：

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远程光机系统的全光同步

远程机械振荡器之间的同步和频率锁定具有科学和技术重要性。关键挑战是调整振荡频率并实现两个振荡器与能够长距离传输的公共载波的强非线性相互作用。在这里，我们通过实验实现了两个不同的光机械系统，一个微球和一个微盘之间的全光同步。由辐射压力引起的微球的机械振荡通过光机械相互作用加载到泵浦激光器上，直接通过5公里长的单模光纤传输，激发微盘的机械振荡。通过微调两个微谐振器的光学和机械频率，微盘的振荡被注入锁定到微球，导致两个系统的同步相位关系。我们的结果推动了使用光机械微谐振器的长距离同步网络。