Carrier-phase two-way satellite frequency transfer between LNE-SYRTE and PTB

Fujieda, Miho; Takiguchi, Hiroshi; Achkar, Joseph; Abgrall, M.; Guéna, Jocelyne; Riedel, Franziska; Benkler, E.; Weyers, S.; Piester, D.

doi:10.1109/eftf.2016.7477798

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…A more stringent test is to compare distant clocks operated by independent teams in separate laboratories. To date, however, the uncertainties of distant comparisons have been limited by the comparison methods relying on satellite based time and frequency transfer techniques via the U.S. global positioning system (GPS) or two-way satellite time and frequency transfer (TWSTFT) [9,10], or TAI itself used as a flywheel [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

First international comparison of fountain primary frequency standards via a long distance optical fiber link

et al. 2017

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We report on the first comparison of distant caesium fountain primary frequency standards (PFSs) via an optical fiber link. The 1415 km long optical link connects two PFSs at LNE-SYRTE (Laboratoire National de métrologie et d'Essais -SYstème de Références Temps-Espace) in Paris (France) with two at PTB (Physikalisch-Technische Bundesanstalt) in Braunschweig (Germany). For a long time, these PFSs have been major contributors to accuracy of the International Atomic Time (TAI), with stated accuracies of around 3 × 10 −16 . They have also been the references for a number of absolute measurements of clock transition frequencies in various optical frequency standards in view of a future redefinition of the second. The phase coherent optical frequency transfer via a stabilized telecom fiber link enables far better resolution than any other means of frequency transfer based on satellite links. The agreement for each pair of distant fountains compared is well within the combined uncertainty of a few 10 −16 for all the comparisons, which fully supports the stated PFSs' uncertainties. The comparison also includes a rubidium fountain frequency standard participating in the steering of TAI and enables a new absolute determination of the 87 Rb ground state hyperfine transition frequency with an uncertainty of 3.1 × 10 −16 .

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Section: Introductionmentioning

confidence: 99%

First international comparison of fountain primary frequency standards via a long distance optical fiber link

et al. 2017

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“…At present, the Two-Way Satellite Time and Frequency Transfer (TWSTFT) technology is mainly used to realize remote international time comparisons. The uncertainty of TWSTFT is about 1 ns [10], and the fractional frequency instability of TWSTFT is about 10 −15 -10 −16 in one day [11,12]. The optical fiber time-frequency transfer technology is also used between time-keeping laboratories to achieve a high-precision time-frequency transfer.…”

Section: Introductionmentioning

confidence: 99%

Optical Frequency Transfer on the Order of 10−19 Fractional Frequency Instability over a 64 m Free-Space Link

Wang,

Lu,

Liang

et al. 2024

Photonics

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High-precision time–frequency is widely used in time measurement, satellite navigation, scientific research, and other fields. With the rapid development of optical clock technology, the fractional frequency instability and uncertainty of optical clock have reached 10−18 orders of magnitude, which is expected to contribute to generating the International Atomic Time and may even be used to redefine the “second” in the future. Therefore, the long-distance transfer of time–frequency signals between optical atomic clocks is of great significance. Free-space optical frequency transfer technology is one of the important technologies for solving the space-based optical clock comparison because of its high transfer precision and easy networking characteristics. In order to solve the long-distance space-based optical clock comparison, this paper investigates a free-space active phase noise compensation method using an Acousto-Optic Modulator (AOM), based on the traditional optical fiber phase noise compensation scheme. This new method is more flexible and scalable than the optical fiber time–frequency transfer technology. The optical frequency transfer over a 64 m free-space link is demonstrated. The fractional frequency transfer instability during free running is 9.50 × 10−16 at 1 s, and 4.44 × 10−16 at 2000 s, and the fractional frequency instability after compensation is 7.10 × 10−17 at 1 s, 3.07 × 10−19 at 2000 s, which is about 1–3 orders of magnitude better than that in free running, and provides a feasible scheme for space-based optical clock comparison.

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“…At present, satellite common-view and two-way satellite time and frequency transfer (TW-STFT) technologies are mainly used to achieve remote international time comparison [8]. The relative frequency stability of TWSTFT is the highest in the traditional time-frequency transfer method based on microwaves, and its stability is about 10 −15 ∼10 −16 /day [9,10]. Conventional time-frequency transfer accuracy based on microwaves cannot meet the requirement satisfied by the optical clocks.…”

Section: Introductionmentioning

confidence: 99%

Metrology and Measurement Systems

Wang¹,

Yao²,

Yan³

et al. 2019

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In this paper, we propose and experimentally demonstrate a new method for optical frequency transfer over fibre. Instead of dual acousto-optic modulators (AOMs) as adopted in the traditional fibre phase noise compensation setup, here an active fibre phase noise compensation scheme with a single acousto-optic modulator (AOM) is used. The configuration simplifies the equipment of the user end while maintaining a high-performance optical frequency transfer stability. We demonstrate an actively stabilized coherent transfer at an optical frequency of 193.55THz over 10-km spooled fibre, obtaining a relative frequency stability (Allan deviation) of 3.84 × 10 −16 /1 s and 4.08 × 10 −18 /10 4 s, which is improved by about 2∼3 orders of magnitude in comparison with the one without any phase noise compensation that achieves a relative frequency stability of 1.81 × 10 −14 /1 s and 2.48 × 10 −15 /10 4 s.

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Carrier-phase two-way satellite frequency transfer between LNE-SYRTE and PTB

Cited by 4 publications

References 4 publications

First international comparison of fountain primary frequency standards via a long distance optical fiber link

First international comparison of fountain primary frequency standards via a long distance optical fiber link

Optical Frequency Transfer on the Order of 10−19 Fractional Frequency Instability over a 64 m Free-Space Link

Metrology and Measurement Systems

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