Time transfer using fiber links

Smotlacha, Vladimír; Kuna, Alexander; Mache, Werner

doi:10.1109/eftf.2010.6533650

Cited by 26 publications

(19 citation statements)

References 2 publications

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“…Several studies are being undertaken all over the world for large scale time dissemination [6][7][8][9][10]. The main objective of our study is to disseminate time (and frequency) to multiple users (typically hundreds of users) over long haul telecom fiber links with time accuracy in the range of one microsecond at worst to about one nanosecond.…”

Section: Introductionmentioning

confidence: 99%

Time transfer over a White Rabbit network

Kaur¹,

Tuckey²,

Pottie³

2016

2016 European Frequency and Time Forum (EFTF)

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We started experiments with White Rabbit at LNE-SYRTE for time and frequency dissemination to a large number of users over long haul telecommunication networks. We consider in this paper preliminary work performed on fiber spools, and comparing two situations, one link with one optical fiber and two colors, and a second link with two fibers and a single wavelength. We present preliminary results showing time deviation down to 1 ps at 1000 seconds and Allan deviation as low as 10 -15 for about 10000 seconds, for both configurations. We discuss the effect of chromatic dispersion on long haul time transfer regarding stability and accuracy. Finally, we outline our plan for future work.

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Section: Introductionmentioning

confidence: 99%

Time transfer over a White Rabbit network

Kaur¹,

Tuckey²,

Pottie³

2016

2016 European Frequency and Time Forum (EFTF)

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“…Currently, multiple research teams are oriented at ultrastable frequency transfer through optical fibers 31 32 33 34 , and a frequency instability of 10 −20 after 10 3 s averaging time has been demonstrated 34 . However, time scale comparisons are always necessary, therefore methods on time transfer through optical fibers(TTTOF) are also under investigation 35 36 37 38 39 40 41 42 . Among all the achieved results, a timing stability of the time transfer over 158 km long optical link with minimum value of 300 fs in terms of time deviation (TDEV) at averaging time of 10 s has been presented 37 .…”

mentioning

confidence: 99%

Demonstration of quantum synchronization based on second-order quantum coherence of entangled photons

Quan¹,

Zhai²,

Wang³

et al. 2016

Sci Rep

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Based on the second-order quantum interference between frequency entangled photons that are generated by parametric down conversion, a quantum strategic algorithm for synchronizing two spatially separated clocks has been recently presented. In the reference frame of a Hong-Ou-Mandel (HOM) interferometer, photon correlations are used to define simultaneous events. Once the HOM interferometer is balanced by use of an adjustable optical delay in one arm, arrival times of simulta- neously generated photons are recorded by each clock. The clock offset is determined by correlation measurement of the recorded arrival times. Utilizing this algorithm, we demonstrate a proof-of-principle experiment for synchronizing two clocks separated by 4 km fiber link. A minimum timing stability of 0.44 ps at averaging time of 16000 s is achieved with an absolute time accuracy of 73.2 ps. The timing stability is verified to be limited by the correlation measurement device and ideally can be better than 10 fs. Such results shine a light to the application of quantum clock synchronization in the real high-accuracy timing system.

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“…高精度时频传递技术在深空探测、卫星导航、电力传输、科学研究等领域起着至关重要的作用。光纤相对于传统的电缆具有低损耗、高带宽、抗电磁干扰性能强等优点，且比自由空间通道的稳定性更好，利用光纤链路进行高精度远距离时频传递引起了广泛关注 [1][2][3] 。波兰克拉科夫 AGH 理工大学和捷克教育科研网(CESNET)采用波分复用 (WDM)的时间传递方案分别报道了 480 km 和 740 km 光纤时间传递实验，天稳定度分别优于 1 ps 和 100 ps [4][5] 。基于 WDM 的光纤时间传递方案存在色散等导致的双向传输时延不对称性，需要复杂的高精度光纤链路标定技术 [4] 。文献 [6]…”

Section: 引言unclassified

Effects of Link Delay Fluctuations on Stability of Fiber-Optic Time Transfer

Shaoping¹,

Hao²,

Wenning³

et al. 2016

激光与光电子学进展

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The delay fluctuations of optical fiber link, related to the variations of laser output wavelength and ambient temperature along the transmission link, directly affect the stability of fiber-optic time transfer. The relationship between the stability of long distance fiber-optic time transfer and the variations of laser wavelength and the temperature of optical fiber link is derived by using a link segmentation processing method. Wavelength fluctuations are modeled based on the analysis of measured wavelength data of laser. A 3000 km optical fiber link is emulated based on the actual temperature data, and the effects of wavelength fluctuations and depth of buried optical fiber link on the stability of fiber-optic time transfer adopting bidirectional time division multiplexing (BTDM) and wavelength division multiplexing (WDM) respectively are analyzed. The results show that the temperature variations of optical fiber link mainly have effect on the long-term stability, and this effect changes with the depth of buried optical fiber link and work season of time transfer. The wavelength jitter of laser mainly degrades the short-term stability of fiber-optic time transfer, while the wavelength drift of laser mainly has impact on the stability at the averaging time related to the cycle of wavelength drift. When the standard deviation of wavelength jitter of laser changes from (0.07, 0.05) pm to (0.27, 0.25) pm, the stability of 3000 km fiber-optic time transfer will deteriorate from 3 ps/s to 12 ps/s.

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Time transfer using fiber links

Cited by 26 publications

References 2 publications

Time transfer over a White Rabbit network

Time transfer over a White Rabbit network

Demonstration of quantum synchronization based on second-order quantum coherence of entangled photons

Effects of Link Delay Fluctuations on Stability of Fiber-Optic Time Transfer

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