Fiber-optic joint time and frequency transmission with enhanced time precision

Zuo, Faxing; Li, Qi; Xie, Kunfeng; Hu, Liang; Chen, Jianping; Wu, Guiling

doi:10.1364/ol.450696

Cited by 14 publications

(7 citation statements)

References 16 publications

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“…With active compensation based on an optical delay line, the frequency instability 5:9 × 10 −17 at 10,000 s over a 106-km urban fiber link is obtained. Much excellent research has been done on long distance optical frequency [22] , radio frequency [23,24] , time [25,26] , and simultaneous transmission [27][28][29][30][31] . All of the present research is focused on the joint transmission of metrological signals over longer or more complex optical fiber links.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous transmission of time-frequency and data with co-amplification over urban fiber links

Cao,

Tong,

Liu

et al. 2024

中国光学快报

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We demonstrate a simultaneous transmission of time-frequency and data over a 160-km urban business network in Shanghai. The signals are transmitted through a cascaded optical link consisting of 48 km and 32 km, which are connected by an optical relay. The metrological signals are inserted into the communication network using dense wavelength division multiplexing. The influence of the interference between different signals has been discussed. The experimental results demonstrate that the radio frequency (RF) instability can reach 2:1 × 10 −14 at 1 s and 2:3 × 10 −17 at 10,000 s, and the time interval transfer of one pulse per second (1 PPS) signal with less than 10 ps at 1 s is obtained. This work paves the way for the widespread dissemination of ultra-stable time and frequency signals over the communication networks.

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Section: Introductionmentioning

confidence: 99%

Simultaneous transmission of time-frequency and data with co-amplification over urban fiber links

Cao,

Tong,

Liu

et al. 2024

中国光学快报

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“…Researchers studying high-precision fiber-optic timefrequency transmission [9][10][11][12], the time-frequency transmission method with the highest transmission accuracy attainable currently, have made significant progress in applications independent of Ethernet. Beloy et al [13] reported a network comparison of three optical clocks, with fractional ratio uncertainties between 6 × 10 −18 and 8 × 10 −18 .…”

Section: Introductionmentioning

confidence: 99%

High-precision time–frequency synchronization in Ethernet communication networks

Shi¹,

Yang²,

Cao³

et al. 2023

Laser Phys. Lett.

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Currently, many applications require not only high-speed communication, but also high-precision time–frequency synchronization. However, the simultaneous transmission and exchange of digital time signals with continuous analog frequency signals face challenges in large-scale Ethernet networks. Here we report a method to converge high-precision time–frequency synchronization and communication in fiber-optic distributed Ethernet networks. The time–frequency signals are multiplexed by wavelength division to the communication data with different optical wavelengths. The transmission error of the time–frequency signals was measured and controlled using a round-trip method. Network switching is implemented by add-drop multiplexing with a continuous wavelength selector switch and IP packets for the frequency signal and communication data, respectively. Experimental verification is carried out in a five-node network. In this network, high-precision time–frequency synchronization in Ethernet communication networks is realized. The frequency instability is less than 3 × 10−14@1 s, and the time synchronization offset is less than 70 ps with the communication rate of 1.25 Gbps. These results demonstrate the broad application prospects of the proposed method in distributed coherent detection fields with multiple nodes.

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“…Over the last decades, signal transfer over optical fiber has been established as a solution to surpass the stability and accuracy of GNSS links [5]. Recent work has demonstrated timing signal transfer with compensation of fiber-length variation over dark channels of commercial communications fiber [6], [7], [8] and packet-based methods such as ''White Rabbit'' [9].…”

Section: Introductionmentioning

confidence: 99%

Fiber-Optic Frequency and Timing Transfer Over an Urban Optical Fiber Link

Fujieda

Kumagai

2023

IEEE Open J. Ultrason., Ferroelect., Freq. Contr.

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We have developed a fiber-optic frequency and timing transfer system. It has been installed to provide timing synchronization between NICT and a distant university site connected by a 58-km urban optical fiber link. The timing signal generated at the remote site is derived from a frequency source that is stabilized using the link, and it is synchronized by a transferred timing marker. A second, separate fiber link confirms a timing synchronization uncertainty of 5.7 ns and a 10-MHz frequency instability of less than 10 −16 at 10 5 s averaging time. We additionally demonstrate a timing marker delivery using a code-based signal, which combines nanosecond-level uncertainty with the simplicity and compactness suitable for a system that can be deployed for synchronization across numerous sites. INDEX TERMSFrequency transfer, time transfer, optical fibers.

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Fiber-optic joint time and frequency transmission with enhanced time precision

Cited by 14 publications

References 16 publications

Simultaneous transmission of time-frequency and data with co-amplification over urban fiber links

Simultaneous transmission of time-frequency and data with co-amplification over urban fiber links

High-precision time–frequency synchronization in Ethernet communication networks

Fiber-Optic Frequency and Timing Transfer Over an Urban Optical Fiber Link

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