Optical fibers in time and frequency transfer

Śliwczyński, Ł.; Krehlik, P.; Lipiński, Marek

doi:10.1088/0957-0233/21/7/075302

Cited by 95 publications

(43 citation statements)

References 37 publications

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“…4(b). The delay fluctuation reflects the long-term stability of the compensation scheme [16]- [18]. The peak-to-peak delay fluctuation with active stabilization is 3.15 ps during 10 4 s recording time interval.…”

Section: Experiments and Resultsmentioning

confidence: 98%

Phase-Stabilized Delivery for Multiple Local Oscillator Signals via Optical Fiber

et al. 2014

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In this paper, we propose and demonstrate a multiple local oscillator (LO) signal phase stabilization technique for long-distance fiber delivery. One of the LO signals, which acts as a reference single, is round-trip transferred between the central station and the remote end, carrying the phase variation arises from perturbations of the fiber link. The wavelength of the optical carrier is adjusted according to the phase variation of the reference LO, to stabilize the delay of the fiber link. Once the delay of the link is stabilized, the phases of other LO signals that transferred through the same fiber link will all be stabilized. Meanwhile, the delay tunable range is in proportion to the fiber length, which means a very long delivery distance can be expected. Experimentally, LOs at frequencies of 2.46 GHz and 8 GHz are transferred through a 30-km fiber link, and significant phase drift compression is observed at both frequencies.

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Section: Experiments and Resultsmentioning

confidence: 98%

Phase-Stabilized Delivery for Multiple Local Oscillator Signals via Optical Fiber

et al. 2014

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“…Fiber-optic time transfer has attracted widespread research interest [1][2][3][4][5][6][7] because of its advantages of low loss, high reliability, wide bandwidth and high stability, and satellite-based time transfer is difficult to eliminate the effects of fluctuations and interferences induced by atmosphere [8][9]. Up to now, fiber-based time transfer mainly concentrates on two-way [1][2] and round-trip [3][4][5][6][7] dissemination using bidirectional wavelength division multiplexing (WDM) transmission that can suppress the impact of the Rayleigh backscattering by using WDM filter.…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, fiber-based time transfer mainly concentrates on two-way [1][2] and round-trip [3][4][5][6][7] dissemination using bidirectional wavelength division multiplexing (WDM) transmission that can suppress the impact of the Rayleigh backscattering by using WDM filter. The bidirectional WDM-based scheme, however, will cause bidirectional propagation delay mismatch induced by the chromatic dispersion, which will degrade the precision and accuracy of time transfer.…”

Section: Introductionmentioning

confidence: 99%

A round-trip fiber-optic time transfer system using bidirectional TDM transmission

Zhang

et al. 2015

2015 Joint Conference of the IEEE International Frequency Control Symposium &Amp; The European Frequency and Time Forum

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We propose a round-trip fiber-optic time transfer scheme over single optical fiber utilizing the same wavelength in both directions. It can suppress the impact of the Rayleigh backscattering and the dispersion-induced symmetric deviation over fiber link by using bidirectional time division multiplexing (TDM) mechanism. A 200 km time transfer over single optical fiber with identical optical wavelength in both directions is demonstrated. The measured stabilities in terms of TDEV are less than 40ps/s and 10ps/d, respectively. The uncertainty induced by uncalibrated fiber links up to 200km is less than 27 ps, which is mainly limited by the performance of used time interval counters.

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“…9 Accordingly, the signal to noise ratio (SNR) of the received signal will be degraded, which increases the time jitter of received signal and eventually affects the stability of the time transfer. 10,11 In this paper, we present a new scheme for high-precision two-way optic-fiber time transfer. We modify the IRIG-B time code first to make it suitable for direct transmission using commercial optical communication transceivers.…”

Section: Introductionmentioning

confidence: 99%

High-precision two-way optic-fiber time transfer using an improved time code

Zhang

et al. 2014

Review of Scientific Instruments

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We present a novel high-precision two-way optic-fiber time transfer scheme. The Inter-Range Instrumentation Group (IRIG-B) time code is modified by increasing bit rate and defining new fields. The modified time code can be transmitted directly using commercial optical transceivers and is able to efficiently suppress the effect of the Rayleigh backscattering in the optical fiber. A dedicated codec (encoder and decoder) with low delay fluctuation is developed. The synchronization issue is addressed by adopting a mask technique and combinational logic circuit. Its delay fluctuation is less than 27 ps in terms of the standard deviation. The two-way optic-fiber time transfer using the improved codec scheme is verified experimentally over 2 m to100 km fiber links. The results show that the stability over 100 km fiber link is always less than 35 ps with the minimum value of about 2 ps at the averaging time around 1000 s. The uncertainty of time difference induced by the chromatic dispersion over 100 km is less than 22 ps.

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Optical fibers in time and frequency transfer

Cited by 95 publications

References 37 publications

Phase-Stabilized Delivery for Multiple Local Oscillator Signals via Optical Fiber

Phase-Stabilized Delivery for Multiple Local Oscillator Signals via Optical Fiber

A round-trip fiber-optic time transfer system using bidirectional TDM transmission

High-precision two-way optic-fiber time transfer using an improved time code

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