Joint Frequency and Time Transfer Over Optical Fiber With High-Precision Delay Variation Measurement Using a Phase-Locked Loop
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...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2019-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8642877/ |
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| Summary: | 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<sup>−17</sup> 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. |
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| ISSN: | 1943-0655 |