Optical Fiber Transfer Delay Measurement Based on Phase-Derived Ranging

Li, Shupeng; Wang, Xiangchuan; Qing, Ting; Liu, Shifeng; Fu, Jianbin; Xue, Min; Pan, Shilong

doi:10.1109/lpt.2019.2926508

Cited by 16 publications

(9 citation statements)

References 23 publications

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“…Therefore, the measurement precision in the closed‐loop system is around 0.1 ps, which meets with the result obtained in a fiber link. [ 26,27 ]…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the measurement precision in the closed-loop system is around 0.1 ps, which meets with the result obtained in a fiber link. [26,27] To test the stability of the stabilized RoFSO link, a second ATD measurement system with a different optical wavelength is established, which is independent of the closed-loop system. (The details about the out-of-loop measurement are shown in Note S6, Supporting Information).…”

Section: Applications and Discussionmentioning

confidence: 99%

“…[ 27 ] Finally, the absolute phase delays (unwrapped phases) φ i at different frequencies are obtained. The ATD can be calculated as [ 26 ]

\begin{equation}\tau = \left( {{N_{\rm{M}}} + \frac{{{\theta _{\rm{M}}}}}{{2{{\pi}}}}} \right)\frac{1}{{{f_{\rm{M}}}}}\end{equation}

where f M is the maximum frequency that is used in the measurement, θ M is the wrapped phase measured at f M , and N M can be calculated at f M by the phase unwrapping algorithm. The measurement precision depends on the precision of the MPD, which is better than ±0.1°.…”

Section: Principle and Experimentsmentioning

confidence: 99%

“…[ 18 ] Therefore, compared to the comb‐based solutions, a simple and low‐cost ATD measurement system with sub‐picosecond precision that is compatible with the existing RF systems would greatly promote the popularization of distributed RF systems. In 2019, we demonstrated optical transfer delay measurement directly over an RoF link based on phase‐derived ranging, [ 26 ] by which the measurement accuracy in a 34 km optical fiber was less than 0.1 ps. [ 27 ] The proposed method achieves high‐precision measurement with a narrowband signal, while barely changing the hardware, which is attractive to be applied in a distributed RF system.…”

Section: Introductionmentioning

confidence: 99%

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Absolute Time Delay Measurement Over an Existing Radio Over Free‐Space Optical Link with Sub‐Picosecond Precision

Sun

Zhang

et al. 2023

Laser & Photonics Reviews

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Distributed RF systems are referred to as the fundamental structure for future wireless communication and sensors. To enable wideband coherent operation, synchronization across the distributed systems with massive parallel absolute time delay (ATD) measurements up to sub‐picosecond precision should be implemented. Traditional ways to achieve precise ATD measurements usually rely on probe signals with broad bandwidth, while that of RF systems is limited. Although an all‐optical solution has high precision, it is complex and not compatible with RF systems. Microwave photonics, which combines the merits of RF and photonics, potentially provides a low‐cost and high‐precision solution that can be deployed in existing RF systems. Here, ATD measurement with sub‐picosecond precision directly over an existing radio over free‐space optical (RoFSO) link, requiring no additional hardware beyond the link, is achieved. The bandwidth of the system is only 10 MHz, while the measurement results meet well with those obtained by optical combs. The measurement errors caused by atmospheric turbulence are well suppressed by a dynamic Kalman filter. The RoFSO links can be stabilized in a closed‐loop measurement. The standard deviation of the timing jitter is 0.28 ps, and the Allan variance is around 1.9 × 10−19 @ 1000 s, which is sufficient to synchronize millimeter‐wave signals.

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“…Therefore, the measurement precision in the closed‐loop system is around 0.1 ps, which meets with the result obtained in a fiber link. [ 26,27 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Applications and Discussionmentioning

confidence: 99%

“…[ 27 ] Finally, the absolute phase delays (unwrapped phases) φ i at different frequencies are obtained. The ATD can be calculated as [ 26 ]

\begin{equation}\tau = \left( {{N_{\rm{M}}} + \frac{{{\theta _{\rm{M}}}}}{{2{{\pi}}}}} \right)\frac{1}{{{f_{\rm{M}}}}}\end{equation}

Section: Principle and Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Absolute Time Delay Measurement Over an Existing Radio Over Free‐Space Optical Link with Sub‐Picosecond Precision

Sun

Zhang

et al. 2023

Laser & Photonics Reviews

Self Cite

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“…The low loss and small dispersion optical fiber can serve as a broadband delay line with a large amount of delay but ignorable loss for radar target simulators, to test radars on aircrafts and ships. With phase-derived ranging enabled by bidirectional transmission, accurate length of a long fiber can be achieved with a resolution of 0.001 ps [57], [58], ensuring precise analog signal processing in the optical domain due to the fact that time delay is one of the essential elements of analog signal processing. By inserting a length of optical fiber into a microwave oscillator together with EO and OE converters, an unprecedented high-Q optoelectronic cavity would be formed, which can generate a high-purity and low-phase-noise microwave LO signal (see OEOs in Section III).…”

Section: B High-performance Signal Transmissionmentioning

confidence: 99%

Microwave Photonic Radars

Pan

Zhang

2020

J. Lightwave Technol.

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259

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As the only method for all-weather, all-time and longdistance target detection and recognition, radar has been intensively studied since it was invented, and is considered as an essential sensor for future intelligent society. In the past few decades, great efforts were devoted to improving radar's functionality, precision, and response time, of which the key is to generate, control and process a wideband signal with high speed. Thanks to the broad bandwidth, flat response, low loss transmission, multidimensional multiplexing, ultrafast analog signal processing and electromagnetic interference immunity provided by modern photonics, implementation of the radar in the optical domain can achieve better performance in terms of resolution, coverage, and speed which would be difficult (if not impossible) to implement using traditional, even state-of-the-art electronics. In this tutorial, we overview the distinct features of microwave photonics and some key microwave photonic technologies that are currently known to be attractive for radars. System architectures and their performance that may interest the radar society are emphasized. Emerging technologies in this area and possible future research directions are discussed.

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