Sub-femtosecond synchronization of microwave oscillators with mode-locked Er-fiber lasers
| Autor: | Jung, Kwangyun, Kim, Jungwon |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Opt. Lett. 37, 2958-2960 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1364/OL.37.002958 |
| Popis: | We synchronize a 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 hours, which reaches 4\times10^{-19} fractional frequency instability at 1800 s averaging time. This method has a potential to provide both sub-fs-level short-term phase noise and long-term phase stability in microwave extraction from mode-locked fiber lasers. Comment: 4 pages, 4 figures, Optics Letters (in press) |
| Databáze: | arXiv |
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