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Subfemtosecond synchronization of microwave oscillators with mode-locked Er-fiber lasers

机译:锁模Er光纤激光器对微波振荡器的亚飞秒同步

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We synchronize an 8.06 GHz microwave signal from a voltage-controlled oscillator with an optical pulse train from a 77.5 MHz mode-locked Er-fiber laser using a fiber-based optical-microwave phase detector. The residual phase noise between the optical pulse train and the synchronized microwave signal is -133 dBc/Hz (-154 dBc/Hz) at 1 Hz (5 kHz) offset frequency, which results in 838 as integrated rms timing jitter [1 Hz-1 MHz]. The long-term residual phase drift is 847 as (rms) measured over 2 h, which reaches 4 X 10~(-19) fractional frequency instability at 1800 s averaging time. This method has a potential to provide both subfemtosecond-level short-term phase noise and long-term phase stability in microwave extraction from mode-locked fiber lasers.
机译:我们使用基于光纤的微波相位检测器,将来自压控振荡器的8.06 GHz微波信号与来自77.5 MHz锁模Er光纤激光器的光脉冲序列进行同步。在1 Hz(5 kHz)偏移频率下,光脉冲序列和同步微波信号之间的残留相位噪声为-133 dBc / Hz(-154 dBc / Hz),这导致838积分rms定时抖动[1 Hz- 1 MHz]。在2小时内测得的长期残余相位漂移为(rms)847,在1800 s的平均时间达到4 X 10〜(-19)分数频率不稳定性。这种方法有潜力在锁模光纤激光器的微波提取中提供亚飞秒级的短期相位噪声和长期相位稳定性。

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