Ultra-long phase-sensitive OTDR with hybrid distributed amplification

Wang, Zinan; Zeng, Jiajia; Li, J; Fan, Mengqiu; Peng, Fei; Zhang, L; Zhou, Yuqiu; Rao, Yunjiang

doi:10.1364/ol.39.005866

Cited by 259 publications

(96 citation statements)

References 13 publications

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“…G ON-OFF (z 0 ) represents the on-off gain from the starting point to z 0 , which can be obtained by comparing the pulse intensity at z 0 with and without the amplification of the Raman Pump [8]. I RS stands for the intensity of the Rayleigh backscattered signal, while the Rayleigh backscattered curve of the experimental result is an electronic linear response to I RS , which means that the envelop trace of I RS is similar to the detected signal curve.…”

Section: Results and Analysismentioning

confidence: 99%

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Phase-sensitive optical time-domain reflectometry amplified by gated Raman pump

Zhou

Zhang

et al. 2015

Photonic Sens

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Abstract:A long-range phase-sensitive optical time-domain reflectometry is proposed and experimentally demonstrated, based on the gated Raman amplification (RA). This technique can reduce the amplified spontaneous emissions (ASE) noise of the Raman pump while extend the sensing distance. A direct-detection based phase-sensitive optical time-domain reflectometry (Φ-OTDR) with an operation range of 50 km and a spatial resolution of 20 m has been demonstrated. The influence of different delay time of the gated Raman pump on the Φ-OTDR system is also discussed.

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Section: Results and Analysismentioning

confidence: 99%

“…Besides, Φ-OTDR is able to achieve an ultra-long sensing range. The longest repeater-less DOFS was demonstrated in the form of Φ-OTDR so far [8].…”

Section: Introductionmentioning

confidence: 95%

Phase-sensitive optical time-domain reflectometry amplified by gated Raman pump

Zhou

Zhang

et al. 2015

Photonic Sens

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“…Over the last years, distributed nonlinear amplification techniques (Raman, Brillouin or parametric) have been extensively implemented in DOFS [14]- [19]. As the attenuation losses are compensated along the measuring fiber, This article has been accepted for publication in a future issue of this journal, but has not been fully edited.…”

Section: Introductionmentioning

confidence: 99%

Chirped-Pulse Phase-Sensitive Reflectometer Assisted by First-Order Raman Amplification

Pastor-Graells

Nuño

Fernández‐Ruiz

et al. 2017

J. Lightwave Technol.

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Abstract-The use of linearly chirped probe pulses in phase sensitive-(Φ)OTDR technology has been recently demonstrated to allow for high-resolution, quantitative and dynamic temperature or strain variation measurements in a simple and very robust manner. This new sensing technology, known as chirped-pulse ΦOTDR, had a maximum reported sensing range of 11 km. In this paper, a 75 km sensing range with 10 m spatial resolution is demonstrated by using bidirectional first order Raman amplification. The system is capable of performing truly linear, single-shot measurements of strain perturbations with an update rate of 1 kHz and 1 nε resolution. The time-domain trace of the sensor exhibits a signal to noise ratio (SNR) in the worst point of >3 dB, allowing to monitor vibrations up to 500 Hz with remarkable accuracy. To demonstrate the capabilities of the proposed system, we apply <100 nε vibrations in the noisiest point of the fiber, with a frequency modulated from 70 Hz to 150 Hz over a period of 10 s. The results obtained in these conditions demonstrate a vibration detection SNR of >20 dB (with only 300 ms analysis window and no post-processing) and no evidence of nonlinearity in the acoustic response. The optical nonlinear effects that the probe pulse could suffer along the sensing fiber are thoroughly studied, paying special attention to potential distortions of the pulse shape, particularly in its instantaneous frequency profile. Our analysis reveals that, for proper values of peak power, the pulse does not suffer any major distortion and therefore the system performance is not compromised.

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“…It has been applied in many fields such as civil structure health monitoring and security guarding [1,2]. Accurately, acquiring vibration location has been achieved in the reported Φ-OTDR system by monitoring the amplitude change of backscattered light [3][4][5]. However, for some special applications such as seismic wave detection, it could not satisfy requirements without the ability of providing phase information.…”

Section: Introductionmentioning

confidence: 99%

Enhancement for Φ-OTDR performance by using narrow linewidth light source and signal processing

et al. 2015

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Abstract:In order to enhance the signal-to-noise-ratio of a distributed acoustic sensing system based on phase-sensitive optical time-domain reflectometry (Φ-OTDR), we have proposed a combination of segmented unwrapping algorithm, averaging estimation of phase difference, and infinite impulse response (IIR) filtering method. The enhancement of signal quality is numerically demonstrated. Moreover, we have studied the influence resulted from the light source noise on the Φ-OTDR performance. The result has shown that when the linewidth of light source used in the Φ-OTDR system is narrower, the performance of the system is better. In a word, such a Φ-OTDR system could obtain higher quality demodulated signals when the narrower linewidth light source is chosen and the method of averaging estimation phase difference is used.

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Ultra-long phase-sensitive OTDR with hybrid distributed amplification

Cited by 259 publications

References 13 publications

Phase-sensitive optical time-domain reflectometry amplified by gated Raman pump

Phase-sensitive optical time-domain reflectometry amplified by gated Raman pump

Chirped-Pulse Phase-Sensitive Reflectometer Assisted by First-Order Raman Amplification

Enhancement for Φ-OTDR performance by using narrow linewidth light source and signal processing

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