Phase-sensitive OTDR probe pulse shapes robust against modulation-instability fading

Fernández‐Ruiz, María R.; Martins, Hugo F.; Pastor-Graells, Juan; Martín‐López, Sonia; Gonzalez-Herraez, Miguel

doi:10.1364/ol.41.005756

Cited by 35 publications

(24 citation statements)

References 11 publications

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“…For a given SR (probe pulse-width), several Φ-OTDR based vibration sensor schemes have been proposed to increase the SNR and the DR of the vibration measurement not necessarily by increasing the input probe light peak power but by reducing or controlling the noise present in the system [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. In work [14], the coherent detection based Φ-OTDR system has been proved to have a better SNR than that of direct detection system.…”

Section: Methods and Techniques For Improvement Of The Snr In φ-Otdr 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: Methods and Techniques For Improvement Of The Snr In φ-Otdr 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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“…In order to demonstrate the impact of arbitrarily shape of optical pulse on the quantitative characteristic of the phase signal in the coherent -OTDR system, we use a short AOM based pulse to generate an arbitrarily shape of optical pulse through the MZI structure with an adjusted delay fiber. In contrast with the special shape for interrogating the effect of pulse shape on the amplitude of Rayleigh backscattering signal in [3], the shape generated in Fig. 6 has a more general representation.…”

Section: Arbitrary Shape Of Optical Pulsementioning

confidence: 99%

“…It achieves this function of detecting based on the sensitivity of Rayleigh backscattering light in the optical fiber. Because the laser injected into the fiber is highly coherent, Rayleigh backscattering light along the sensing fiber shows an obvious characteristic of interference which is usually in the form of the speckle-like OTDR trace [1][2][3]. 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.…”

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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“…Some techniques have been proposed to address this issue including making the shape of the probing pulse the main focus of the design [23]. According to the investigation in this work, from among four different types of pulse shapes for the same total pulse energy including 4 Journal of Sensors triangular, rectangular, Gaussian, and super Gaussian, using triangular or Gaussian-like pulses reduces visibility fading in received ϕ-OTDR traces and results in longer sensing range or higher sensitivity.…”

Section: ϕ-Otdr Sensors For Measuring Change In Backscattering Intensitymentioning

confidence: 99%

Recent Advances in Distributed Acoustic Sensing Based on Phase-Sensitive Optical Time Domain Reflectometry

Muanenda

2018

Journal of Sensors

121

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Distributed acoustic sensing (DAS) using coherent Rayleigh backscattering in an optical fiber has become a ubiquitous technique for monitoring multiple dynamic events in real time. It has continued to constitute a steadily increasing share of the fiber-optic sensor market, thanks to its interesting applications in many safety, security, and integrity monitoring systems. In this contribution, an overview of the recent advances of research in DAS based on phase-sensitive optical time domain reflectometry (ϕ-OTDR) is provided. Some advanced techniques used to enhance the performance of ϕ-OTDR sensors for measuring backscattering intensity changes through reduction of measurement noise are presented, in addition to methods used to increase the dynamic measurement capacity of ϕ-OTDR schemes beyond conventional limits set by the sensing distance. Recent ϕ-OTDR configurations which significantly enhance the measurement spatial resolution, including those which decouple it from the probing pulse width, are also discussed. Finally, a review of recent advances in more precise quantitative measurement of an external impact based on frequency shift and phase demodulation methods using simple direct detection ϕ-OTDR schemes is given.

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Phase-sensitive OTDR probe pulse shapes robust against modulation-instability fading

Cited by 35 publications

References 11 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

Recent Advances in Distributed Acoustic Sensing Based on Phase-Sensitive Optical Time Domain Reflectometry

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