The phenomenon of synchronization occurs universally across the natural sciences and provides critical insight into the behaviour of coupled nonlinear dynamical systems. It also offers a powerful approach to robust frequency or temporal locking in diverse applications including communications, superconductors and photonics. Here, we report the experimental synchronization of two coupled soliton mode-locked chip-based frequency combs separated over distances of 20 m. We show that such a system obeys the universal Kuramoto model for synchronization and that the cavity solitons from the microresonators can be coherently combined, which overcomes the fundamental power limit of microresonator-based combs. This study could significantly expand the applications of microresonator combs, and with its capability for massive integration it offers a chip-based photonic platform for exploring complex nonlinear systems.

同步现象在自然科学中普遍存在，并为耦合非线性动力学系统的行为提供了重要的见识。它还提供了一种强大的方法，可以在各种应用（包括通信，超导体和光子学）中实现稳固的频率或时间锁定。在这里，我们报告了在20 m的距离上分开的两个耦合孤子锁模芯片的频率梳的实验同步。我们表明，这样的系统遵循通用的Kuramoto模型进行同步，并且可以将来自微谐振器的腔孤子进行相干组合，从而克服了基于微谐振器的梳子的基本功率限制。这项研究可以显着扩展微谐振器梳的应用，