Joint Frequency and Time Transfer Over Optical Fiber With High-Precision Delay Variation Measurement Using a Phase-Locked Loop
| Autor: | Yi Dong, Zhangweiyi Liu, Weilin Xie, Wei Wei, Xiaocheng Wang, Nan Deng, Daming Han, Lingwei Yang |
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| Rok vydání: | 2019 |
| Předmět: |
lcsh:Applied optics. Photonics
Physics fiber optic systems Phase (waves) lcsh:TA1501-1820 Atomic and Molecular Physics and Optics Root mean square Phase-locked loop Voltage-controlled oscillator time and frequency transfer Control theory Microwave photonics Time deviation lcsh:QC350-467 Time transfer Electrical and Electronic Engineering Allan variance lcsh:Optics. Light Jitter |
| Zdroj: | IEEE Photonics Journal, Vol 11, Iss 2, Pp 1-8 (2019) |
| ISSN: | 1943-0647 |
| Popis: | We demonstrate a simultaneous frequency and time reference dissemination system over 80 km fiber with a phase-locked loop. The phase fluctuation of the transferred radio-frequency (RF) signal is compensated by adjusting the frequency of the voltage-controlled oscillator (VCO), ensuring a highly stable RF signal at the remote end. The high-precision fiber delay variation is simultaneously obtained with a resolution of sub-picosecond by monitoring the phase of the VCO. In order to break the limitation of phase ambiguity and obtain wide-range delay variation measurement, we employ an auxiliary frequency-divided phase measurement branch. A stable time reference transfer is realized after the accurate delay compensation. Experimentally, the frequency stability of the dissemination system with an Allan deviation achieves 1.2 × 10-17 at 10 000 s averaging time, and the time stability with the time deviation reaches 0.97 ps at 4000 s averaging time. The root mean square jitter of the time distribution system is about 6.6 ps. |
| Databáze: | OpenAIRE |
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