Urban Fiber Based Laser Interferometry for Traffic Monitoring and Analysis

Wang, Guan; Pang, Zhongwang; Wang, Fangmin; Chen, Yufeng; Dai, Hongfei; Wang, B.

doi:10.1109/jlt.2022.3209499

Cited by 8 publications

(3 citation statements)

References 60 publications

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“…One is DAS system, and the other is based on laser interferometer. [32][33][34][35][36] The main difference between DAS and laser interferometer is that, laser interferometer uses continuous light input. As shown in Fig.…”

Section: Mainmentioning

confidence: 99%

An underground fiber cable discrimination method based on laser interferometer

Wang,

Song,

Wang

et al. 2023

Preprint

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The maintenance and repair of optical fiber networks often requires the discrimination of underground cables among a group of buried ones. Presently, the methods commonly used are either inefficient or harmful to the fiber cable. In this paper, we evaluate the effectiveness of fiber optic vibration sensing method on underground fiber cable discrimination. We find that the typical vibration sensing method-distributed acoustic sensing (DAS) is not suitable for fiber cable discrimination. Especially for long distance scenario, due to “frequency grafting” effect, the DAS method will give a false response on the spectrum of knock events during cable discrimination process. In response, we propose an underground fiber cable discrimination method based on laser interferometer, and demonstrate it on the 40-km urban fiber cable connecting Tsinghua University and Yongding Road. It can give an obvious and real response to the knock event, and can be used in practical applications.

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Section: Mainmentioning

confidence: 99%

An underground fiber cable discrimination method based on laser interferometer

Wang,

Song,

Wang

et al. 2023

Preprint

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“…Various forms of optical fiber sensing have been considered since the 1960's [6,7], all designed to sense manifold optical properties with various hardware. Contemporary methodologies include optical interferometry [8,9,10,11], microwave frequency interferometry [12], coherent Rayleigh backscatter-based distributed acoustic sensing (DAS) [13,4], and state-of-polarization (SOP) sensing [14,15,16,17]. To start, optical interferometry utilizes a highly-stable laser source to measure the phase of light traversing through fiber, sensing disturbances caused by environmental events such as seismic waves.…”

Section: Introductionmentioning

confidence: 99%

Polarization sensing over terrestrial optical fiber networks

Carver,

Zhou

2024

Preprint

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Wide-scale sensing of natural and human-made events is critical for protecting against environmental disasters and reducing the monetary losses associated with telecommunication service downtime. However, achieving dense sensing coverage is difficult given the high deployment overhead of modern sensor networks. In this work, we offer an in-depth exploration of state of polarization (SOP) sensing over fiber-optic networks using unmodified optical transceivers, establishing a strong correlation with ground truth distributed acoustic sensing (DAS). To validate our sensing methodology, we collect 85 days of SOP and DAS measurements along two colocated, 50km fiber-optic cables in Southern California. We then examine how SOP sensing can improve network reliability by accurately modeling overall network health and preemptively detecting loss of traffic. Finally, we explore the feasibility of wide-scale seismic monitoring with SOP sensing, showcasing the SOP perturbations following low-intensity earthquakes, and the potential to more than double seismic monitoring coverage in Southern California alone.

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“…Instead, the other forward-transmission laser interferometer scheme is employed, which is more suitable for accurately measuring violent train vibrations without distortion. Its large dynamic range has been demonstrated by seismic detection using transoceanic cables [32,33] and violent tra c monitoring in urban area [17,34]. Considering multiple trains running on the same sensing railway, we construct a Residual Neural Network (ResNet) enhanced Long Short-Term Memory (Lstm) neural network for train-induced vibration localizing (Res-LstmNet).…”

Section: Introductionmentioning

confidence: 99%

Laser Interferometry for High-Speed Railway Health Inspection using Telecom Fiber along the Line

Wang,

Song

et al. 2024

Preprint

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The health inspection of widespread High-Speed Railway (HSR) network is crucial to maintain the regular transportation, particularly as the velocity of high-speed trains continues to escalate. To narrow the long inspection period of current track recording vehicle (TRV) method, we have implemented a laser interferometer sensing system to turn those existing fiber cables within HSR cable ducts into effective sensing elements. Based on the distributed vibration sensing of daily passing trains, an average power spectrum density (A-PSD) indicator is used to assess the health of HSR infrastructures. During the observation over one year, A-PSDs of 4 typical infrastructures remain stable, indicating their robust health despite challenging environmental conditions. To demonstrate the sensitivity of A-PSD indicator, we analyze the sensing results of a rail section before and after track maintenance, which shows distinctive A-PSD features corresponding to different levels of creep deformation. Additionally, the sensing system can also report other ambient vibrations, such as seismic waves after propagation of over 300 km. It demonstrates the fiber sensing system not only has the ability to act as a real-time supplementary tool for HSR health inspection, but also has potential to establish a large sensing network.

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Urban Fiber Based Laser Interferometry for Traffic Monitoring and Analysis

Cited by 8 publications

References 60 publications

An underground fiber cable discrimination method based on laser interferometer

An underground fiber cable discrimination method based on laser interferometer

Polarization sensing over terrestrial optical fiber networks

Laser Interferometry for High-Speed Railway Health Inspection using Telecom Fiber along the Line

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