Hu Liang, Tian Xueyang, Wu Guiling, Chen Jianping
Opt Lett. 2020 Aug 1;45(15):4308-4311. doi: 10.1364/OL.393010.
We report on the realization of an optical phase noise cancellation technique by passively embedding the optical phase noise information into a radio frequency signal and creating a copy of the optical frequency signal, which is pre-corrected by the amount of phase noise introduced by optical phase perturbations. Neither phase discrimination nor an active servo controller is required due to the open-loop design, mitigating some technical problems, such as the limited compensation speed and finite phase/timing jitter, in conventional phase noise cancellation. We experimentally demonstrate that this technique maintains the same delay-limited bandwidth and phase noise suppression capability as in conventional techniques, but significantly shortens the response speed and phase recovery time. Passive decoupling optical phase perturbation represents a powerful technique in the domains of optical frequency standard comparisons and tools for future optical atomic clocks, which are now under investigation for a potential redefinition of the International Time Scale.
我们报告了一种光学相位噪声消除技术的实现，该技术通过将光学相位噪声信息被动地嵌入到射频信号中，并创建一个光学频率信号的副本，该副本由光学相位扰动引入的相位噪声量进行预校正。由于采用了开环设计，既不需要相位鉴别也不需要有源伺服控制器，从而缓解了传统相位噪声消除中的一些技术问题，如有限的补偿速度和有限的相位/定时抖动。我们通过实验证明，该技术保持了与传统技术相同的延迟受限带宽和相位噪声抑制能力，但显著缩短了响应速度和相位恢复时间。被动解耦光学相位扰动是光学频率标准比较领域和未来光学原子钟工具中的一项强大技术，目前正在研究其对国际时间尺度潜在重新定义的可能性。
