Cavity-induced phase noise suppression in a Fabry-Perot modulator-based optical frequency comb.
Cavity-induced phase noise suppression in a Fabry-Perot modulator-based optical frequency comb.
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DOI：
10.1364/ol.42.001536
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发表时间：
2017-04
期刊：
影响因子：
3.6
通讯作者：
Joonyoung Kim;D. Richardson;R. Slavík
中科院分区：
文献类型：
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作者：
Joonyoung Kim;D. Richardson;R. Slavík
我们第一次调查，尽我们所知，理论上和实验上，射频（RF）驱动信号的相位噪声如何影响法布里-珀罗（F-P）调制器的各个音调的相位噪声，我们观察到，由于滤波，RF驱动信号相位噪声对梳状输出的预期有害影响被部分抑制F-P腔的特性。我们发现，腔诱导的相位噪声抑制对于高阶梳状音调是最强的，例如，在高偏移频率下，对于第100个梳状音调达到40 dB。对于低RF驱动功率，或者当种子激光器不在F-P腔中谐振时，相位噪声抑制变得甚至更强。对于这两种情况，我们观察到相位噪声抑制增加了10 dB。我们还评估了由于腔诱导的相位噪声降低而获得的定时抖动改善。对于在相隔100个音调的两个梳状音调之间获得的差拍信号，定时抖动（从2.5 MHz到2.5 GHz积分）减小了7倍（与在无腔梳状发生器中获得的定时抖动相比）。
We investigate for the first time, to the best of our knowledge, both theoretically and experimentally, how the phase noise of the radio frequency (RF) drive signal affects the phase noise of the individual tones of a Fabry-Perot (F-P) modulator-based optical frequency comb. We observe that the expected deleterious effect of the RF drive signal phase noise on the comb output is partially suppressed due to the filtering characteristics of the F-P cavity. We found that the cavity-induced phase noise suppression is strongest for high-order comb tones, e.g., reaching up to 40 dB for the 100th comb tone at high offset frequencies. The phase noise suppression becomes even stronger for low RF-drive powers, or when the seed laser does not resonate in the F-P cavity. For both cases, we observe up to a 10 dB increase in phase noise suppression. We also evaluate the timing jitter improvement obtained, thanks to the cavity-induced phase noise reduction. The timing jitter (integrated from 2.5 MHz to 2.5 GHz) decreased by a factor of 7 for the beat signal obtained between two comb tones that are 100 tones apart (in comparison with the timing jitter obtained in a cavity-less comb generator).