Towards accurate optical fibre time transfer in UTC

Jiang, Z.; Czubla, A.; Nawrocki, Jerzy; Lewandowski, W.; Arias, F.

doi:10.1109/eftf.2014.7331473

Cited by 3 publications

(6 citation statements)

References 9 publications

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“…Both laboratories provide local realizations of UTC timescale, and serve as primary source of frequency standard. Connecting them by dedicated fiber-optic time and frequency transfer system allows to improve the generated timescales and opens new opportunities for scientific experiments [11].…”

Section: Example Of Link Optimizationmentioning

confidence: 99%

“…The authors' motivation for the research presented herein is, however, particularly related to an emerging new area of optical network applications, concerned with synchronization of atomic clocks and distribution of ultra-stable time and frequency signals [9][10][11]. A very important demand in such systems is the highest possible symmetry of bidirectional signal transmission realized in a single fiber (differently to standard data transmission systems where a pair of fibers is exploited), thus optical amplifiers used in long-haul applications must be also bidirectional, containing no optical isolators (see Fig.…”

Section: Introductionmentioning

confidence: 99%

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Precise method of estimation of semiconductor laser phase-noise-to-intensity-noise conversion in dispersive fiber

Krehlik

Śliwczyński

2015

Measurement

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Section: Example Of Link Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Precise method of estimation of semiconductor laser phase-noise-to-intensity-noise conversion in dispersive fiber

Krehlik

Śliwczyński

2015

Measurement

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“…Comparing a GPS time link calibration with an optical fibre self-calibration with 200 ps accuracy 1. Introduction Two-way optical fibre time and frequency transfer (TWOTFT) has demonstrated very promising results for applications in frequency transfer at a level compatible with optical clock performance [1][2][3][4][5][6][7][8][9][10][11][12][13] and has recently been used for time transfer with a reported uncertainty of about one hundred ps [1][2][3][4]. In this paper, we focus on the TWOTT time transfer technique which has been in operation since January 2012 over the 420 km baseline between the astrogeodynamic observatory of space research center (AOS) and the central office of measures (GUM) in Poland.…”

Section: Utc(k)mentioning

confidence: 99%

“…The TWOTT equipment and its characteristics are described in detail in [1][2][3][4]. Here we concentrate on its standard uncertainty in terms of the calibration comparison.…”

Section: Twottmentioning

confidence: 99%

“…The uncertainty of the calibration between the measuring points at the AOS and the GUM is evaluated at about 0.2 ns, resulting from three components: (a) the uncertainty of the TWOTT calibration between the two transceivers (0.11 ns); (b) the uncertainty of the delay measurement at the GUM between the transceiver and the calibrator Std B (0.05 ns); and (c) the uncertainty of the delay measurement at the AOS between the transceiver and the Std B (0.15 ns); see [4] for more details. The uncertainty of the direct calibration comparison is estimated to be less than 0.2 ns.…”

Section: Twottmentioning

confidence: 99%

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Comparing a GPS time link calibration with an optical fibre self-calibration with 200 ps accuracy

et al. 2015

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In Poland, an accurate two-way optical fibre time transfer (TWOTT) baseline of 420 km has been developed with a standard uncertainty of 112 ps. Meanwhile, the BIPM has been engaged in a pilot project to reduce the uncertainty of UTC GNSS time transfer calibrations from 5 ns to approximately 1.5 ns, for which it has developed a standard calibration scheme, named METODE, associated with an integrated portable GNSS calibration station. The TWOTT and the METODE respectively represent the world's most advanced time transfer method and calibration facility.In July 2013, the BIPM calibrator and the TWOTT self-calibrated optical fibre transceivers were set up side by side to compare their results. This is the first time that an operational TWOTT has been used in accurate time transfer and the first time that a GNSS calibration method has been validated with a technique accurate to 200 ps. As the two systems are completely independent and the latter is one order of magnitude more accurate than the first, this comparison allowed validation of the METODE and its uncertainty. It also confirmed that any bias in the TWOTT is at most 1 ns.

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Ultrastable long-distance fibre-optic time transfer: active compensation over a wide range of delays

Krehlik¹,

Śliwczyński²,

Buczek³

et al. 2015

Metrologia

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In this paper we describe a new solution of active delay stabilization for fibre-optic distribution of time and RF-frequency signals, which allows one to obtain both high precision and a potentially unlimited range of compensation of the fibre delay fluctuations. The solution is based on a hybrid system exploiting a pair of continuously tuned electronic variable delay lines, and a set of switched optical delays. We present a fully operational prototype of the time and frequency distribution setup based on this idea, which is capable of compensating more than 1 µs of the fiber delay fluctuations, and thus may be used in very long-haul links up to about 1000 km, without the need for any seasonal maintenance. We also report measurements of the time and frequency distribution stability, and the verification of the time transfer calibration.

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Towards accurate optical fibre time transfer in UTC

Cited by 3 publications

References 9 publications

Precise method of estimation of semiconductor laser phase-noise-to-intensity-noise conversion in dispersive fiber

Precise method of estimation of semiconductor laser phase-noise-to-intensity-noise conversion in dispersive fiber

Comparing a GPS time link calibration with an optical fibre self-calibration with 200 ps accuracy

Ultrastable long-distance fibre-optic time transfer: active compensation over a wide range of delays

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