Abstract
Microwave-to-optical phase synchronization techniques have attracted growing research interests in recent years. Here, we demonstrate tight, real-time phase synchronization of an optical frequency comb to a rubidium atomic clock. A detailed mathematical model of the phase locking system is developed to optimize its built-in parameters. Based on the model, we fabricate a phase locking circuit with high integration. Once synchronized, the fractional frequency instability of the repetition rate agrees to 6.35×10−12 at 1 s and the standard deviation is 1.5 mHz, which indicates the phase synchronization system can implement high-precision stabilization. This integrated stable laser comb should enable a wide range of applications beyond the laboratory.
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This work has been supported by the National Natural Science Foundation of China (Nos.61571244 and 61871239), and the Tianjin Research Program of Application Foundation and Advanced Technology (No.18YFZCGX00480).
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Zhang, Wp., Wu, H., Zhou, Wf. et al. Study on ultra-precision phase synchronization technique employing phase-locked loop. Optoelectron. Lett. 17, 134–139 (2021). https://doi.org/10.1007/s11801-021-0036-3
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DOI: https://doi.org/10.1007/s11801-021-0036-3