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Optically synchronized fibre links using spectrally pure chip-scale lasers
Nature Photonics  (IF38.771),  Pub Date : 2021-06-21, DOI: 10.1038/s41566-021-00831-w
Grant M. Brodnik, Mark W. Harrington, John H. Dallyn, Debapam Bose, Wei Zhang, Liron Stern, Paul A. Morton, Ryan O. Behunin, Scott B. Papp, Daniel J. Blumenthal

Precision optical-frequency and phase synchronization over fibre is critical for a variety of applications, from timekeeping to quantum optics. Such applications utilize ultra-coherent sources based on stabilized table-top laser systems. Chip-scale versions of these systems may dramatically broaden the application landscape by reducing the cost, size and power of such exquisite sources. Links based on the required narrow-linewidth integrated lasers, compact reference cavities and control methodologies have not yet been presented. Here, we demonstrate an optically synchronized link that achieves an ultralow residual phase error variance of 3 × 10−4 rad2 at the receiver, using chip-scale stabilized lasers with laser linewidth of ~30 Hz and instability below 2 × 10−13 at 50 ms. This performance is made possible with integrated Brillouin lasers, compact reference cavities and a novel low-bandwidth optical-frequency-stabilized phase-locked loop. These results demonstrate a path towards low-power, precision applications including distributed atomic clocks, quantum links, database synchronization and digital-signal-processor-free coherent fibre interconnects.