Coherent Kramers-Kronig Receiver for $\boldsymbol \Phi$-OTDR

Jiang, Jialin; Wang, Zinan; Yu-hua, WU; Lin, Shengtao; Xiong, Ji; Chen, Yong-Xiang; Rao, Yunjiang

doi:10.1109/jlt.2019.2920530

Cited by 40 publications

(10 citation statements)

References 17 publications

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“…When the Rayleigh backscattered signal and the local oscillator are mixed with the 90° optical hybrid, two detectors can be used to obtain the intensities of two orthogonal polarized lights [21,22]. Then, after Hilbert transforming, the intensities and the phases of two orthogonal polarized lights (with x E and y E represented, respectively) are obtained [23]. By using the definition of Stokes vectors [24], which is shown in (8), the SOPs of the backscattered lights could be obtained.…”

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confidence: 99%

Distributed Fiber Birefringence Measurement Using Pulse-Compression Φ-OTDR

Chen

Xiong

et al. 2020

Photonic Sens

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In this paper, a novel birefringence measurement method through the Rayleigh backscattered lightwave within single-mode fiber is proposed, using a single chirped-pulse with arbitrary state of polarization. Numerical analysis is carried out in detail, then pulse-compression phase-sensitive optical time domain reflectometry (PC-Φ-OTDR) with polarization-diverse coherent detection is employed to verify this method. A 2km spun single-mode fiber is tested with 8.6 cm spatial resolution, and the average birefringence of the fiber under test is measured as 0.234rad/m, which is consistent with previous literatures about single-mode fiber. Moreover, the relationship between the measured birefringence and the spatial resolution is also studied for the first time, and the results show that spatial resolution is crucial for fiber birefringence measurement.

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confidence: 99%

Distributed Fiber Birefringence Measurement Using Pulse-Compression Φ-OTDR

Chen

Xiong

et al. 2020

Photonic Sens

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“…Using Golay pulse coding, the SNR of coherent detection Ф-OTDR can be enhanced by 2 N times [49], and it can be further improved after using bipolar coding [50]. In addition, Kramers-Kronig receivers can suppress the noise caused by the signal-signal beat interference and improve the signal quality [51]. However, these methods to improve the SNR have an upper limit.…”

Section: ф-Otdr With Coherent Detectionmentioning

confidence: 99%

Recent Advances in Phase-Sensitive Optical Time Domain Reflectometry (Ф-OTDR)

Rao

Wang

et al. 2021

Photonic Sens

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Phase-sensitive optical time domain reflectometry (Ф-OTDR) is an effective way to detect vibrations and acoustic waves with high sensitivity, by interrogating coherent Rayleigh backscattering light in sensing fiber. In particular, fiber-optic distributed acoustic sensing (DAS) based on the Ф-OTDR with phase demodulation has been extensively studied and widely used in intrusion detection, borehole seismic acquisition, structure health monitoring, etc., in recent years, with superior advantages such as long sensing range, fast response speed, wide sensing bandwidth, low operation cost and long service lifetime. Significant advances in research and development (R&D) of Ф-OTDR have been made since 2014. In this review, we present a historical review of Ф-OTDR and then summarize the recent progress of Ф-OTDR in the Fiber Optics Research Center (FORC) at University of Electronic Science and Technology of China (UESTC), which is the first group to carry out R&D of Ф-OTDR and invent ultra-sensitive DAS (uDAS) seismometer in China which is elected as one of the ten most significant technology advances of PetroChina in 2019. It can be seen that the Ф-OTDR/DAS technology is currently under its rapid development stage and would reach its climax in the next 5 years.

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“…In order to quantitively reconstruct the vibration amplitude, phase variation at the perturbated fiber segment needs to be demodulated 14 . Heterodyne detection [14][15][16][17][18][19] , I/Q demodulation 20,21 , Kramers-Kronig receiver 22 , RBS self-interference detection [23][24][25][26][27][28][29][30][31] and phase generated carrier [32][33][34] methods are proposed for phase demodulated Φ-OTDR. Besides the detection of dynamic vibrations, Φ-OTDR is also capable of measuring slowly-varying strain or temperature change with a wavelength-swept configuration 35,36 .…”

Section: Introductionmentioning

confidence: 99%

Advances in phase-sensitive optical time-domain reflectometry

Liu¹,

Yu²,

Hong³

et al. 2022

OEA

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Phase-sensitive optical time-domain reflectometry (Φ-OTDR) has attracted numerous attention due to its superior performance in detecting the weak perturbations along the fiber. Relying on the ultra-sensitivity of light phase to the tiny deformation of optical fiber, Φ-OTDR has been treated as a powerful technique with a wide range of applications. It is fundamental to extract the phase of scattering light wave accurately and the methods include coherent detection, I/Q demodulation, 3 by 3 coupler, dual probe pulses, and so on. Meanwhile, researchers have also made great efforts to improve the performance of Φ -OTDR. The frequency response range, the measurement accuracy, the sensing distance, the spatial resolution, and the accuracy of event discrimination, all have been enhanced by various techniques. Furthermore, lots of researches on the applications in various kinds of fields have been carried out, where certain modifications and techniques have been developed. Therefore, Φ-OTDR remains as a booming technique in both researches and applications.

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Coherent Kramers-Kronig Receiver for $\boldsymbol \Phi$-OTDR

Cited by 40 publications

References 17 publications

Distributed Fiber Birefringence Measurement Using Pulse-Compression Φ-OTDR

Distributed Fiber Birefringence Measurement Using Pulse-Compression Φ-OTDR

Recent Advances in Phase-Sensitive Optical Time Domain Reflectometry (Ф-OTDR)

Advances in phase-sensitive optical time-domain reflectometry

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