Phase-Sensitive Optical Time Domain Reflectometer Based on Phase-Generated Carrier Algorithm

Fang, Gaosheng; Xu, Tuanwei; Feng, Shengwen; Li, Fang

doi:10.1109/jlt.2015.2414416

Cited by 176 publications

(51 citation statements)

References 15 publications

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“…In work [58], the authors proposed the phase generated carrier (PGC) demodulation detected light is an interference of the lights recombined by the optical coupler with a time delay since there is a difference in the optical path length and expressed as:…”

Section: φ-Otdr System With Frequency Response Bandwidth Higher Than mentioning

confidence: 99%

Recent Progress in the Performance Enhancement of Phase-Sensitive OTDR Vibration Sensing System

Zinsou¹,

Liu²,

Wang³

et al. 2019

Preprint

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Recently, the phase-sensitive OTDR (Φ-OTDR) based vibration sensor system has gained the focus of many researchers and some efforts have been undertaken to push further the limitations imposed on the performance of the Φ-OTDR sensor system. Then, progress in the different areas of its performance evaluation factors such as: improvement of the signal-to-noise ratio (SNR), spatial resolution (SR) in the sub-meter range, enlargement of the sensing range, frequency response bandwidth over the conventional limit and phase signal demodulation for quantitative measurement have been realized. This paper presents an overview of the recent progress in the Φ-OTDR based vibration sensing system in the different areas mentioned above.

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Section: φ-Otdr System With Frequency Response Bandwidth Higher Than mentioning

confidence: 99%

Recent Progress in the Performance Enhancement of Phase-Sensitive OTDR Vibration Sensing System

Zinsou¹,

Liu²,

Wang³

et al. 2019

Preprint

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show abstract

“…As a matter of fact, the interference characteristic is caused by the accumulation of Rayleigh backscattering lightwaves' optical path differences while these scattered lightwaves are reflected from the scattered particles. Conversely, we can retrieve the statistical phase from these OTDR traces [4][5][6]. Moreover, there is a linear relationship between the phase change and the external perturbation acting on the fiber [7].…”

Section: Introductionmentioning

confidence: 99%

Quantitative characteristic of phase signal with changed pulse in the coherent PHI-OTDR system

Zhong¹,

Zhang²

2020

Preprint

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In the coherent -OTDR system, the phase signal is retrieved based on the reference point and the observation point which are off and closer to the two sides of step of the phase change. In the experiment, the optical pulse with the changed peak power, width or shape is injected into the fiber for interrogating the change of the quantitative characteristic of the measured phase signal. When the pulse width is fixed at 200 ns and its peak power is adjusted from 14 dBm to -23 dBm, the amplitude is slightly increased from 17.3575 rad to 17.4411 rad as long as the Rayleigh backscattering signal can be found in the electrical signal. Changing the pulse width from 260 ns to 80 ns when the peak power is fixed at 14 dBm, the maximum amplitude and the minimum amplitude of the measured phase signal are 17.4625 rad to 17.4509 rad, respectively. When the arbitrary shape of the optical pulse generated from the MZI structure with a changed delay fiber from 3 m to 6 m, the amplitude varies from 17.4558 rad to 17.4819 rad. For every measurement, the change of frequency is also small. And the small value of standard deviation supports the accuracy of the measurement. All the measurements show that the changed pulse nearly has no impact on the quantitative characteristic of the measured phase signal in the coherent -OTDR system.

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“…The reflection spectrum is the intrinsic features of UWFBGs, except the central wavelength and reflection intensity, other features aren't be effected by outer physical factors. Meanwhile, the structure of the OTDR system in this paper only adds one tunable filter contrast with traditional OTDR system [12][13], and only the relative parameters are needed during the measuring procedure. Hence, the measuring system based on this technique is more stable than other methods using special optical components [6][7].…”

Section: Introductionmentioning

confidence: 99%

The Distributed OTDR Measuring System with UWFBGs based on Correlation Degree Spectrum

Zhou¹,

Zhang²

2018

Proceedings of the 2nd International Forum on Management, Education and Information Technology Application (IFMEITA 2017)

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The distributed OTDR measuring system based on correlation degree spectrum of UWFBGs is proposed. The traditional OTDR system uses a white light source to reduce the noise signal induced by the interference from multiple reflections between UWFBGs (reflectivity of each to be 0.1%), in addition we used the optical pulse with high extinction ratio (>40dB) to reduce the noise floor of OTDR trace, so that the large number (330) of the FBGs can be detected at the end of 850m due to the low noise floor. The spectrums of 330FBGs have been characterized with a high-precision tunable filter at the receiver end. By calculating the correlation degree of adjacent spectrum we improved SNR to 35dB. The wavelength shift accuracy is 3.2pm. The accuracy of measured temperature and strain are respectively 3.2and 0.32°C.

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Phase-Sensitive Optical Time Domain Reflectometer Based on Phase-Generated Carrier Algorithm

Cited by 176 publications

References 15 publications

Recent Progress in the Performance Enhancement of Phase-Sensitive OTDR Vibration Sensing System

Recent Progress in the Performance Enhancement of Phase-Sensitive OTDR Vibration Sensing System

Quantitative characteristic of phase signal with changed pulse in the coherent PHI-OTDR system

The Distributed OTDR Measuring System with UWFBGs based on Correlation Degree Spectrum

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