Enhancing the performance of coherent OTDR systems with polarization diversity complementary codes

Dorize, Christian; Awwad, Élie

doi:10.1364/oe.26.012878

Cited by 38 publications

(12 citation statements)

References 14 publications

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“…Here, the fibres are probed using complementary Golay sequences on either one or two polarizations. The use of these complementary sequences allows for a mathematically perfect estimation of the backscattered optical field, considering either a single polarization channel, or a dual-polarization one, as demonstrated in [6].…”

Section: Expectations On Sensing Qualitymentioning

confidence: 99%

“…Coherent φ-OTDR exploits the retro-propagated optical field induced by the Rayleigh backscattering effect in optical fibres, by measuring the backscattered phase of the fibre sensor. The main advantage of phase over intensity is that it offers a linear response to strain [6,7]. It can also capture rapid changes in the disturbances, over high bandwidth.…”

Section: Introductionmentioning

confidence: 99%

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Introducing Coherent MIMO Sensing, a fading-resilient, polarization-independent approach to phase-OTDR

Guerrier,

Dorize,

Awwad

et al. 2020

Preprint

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Nowadays, long distance optical fibre transmission systems use polarization diversity multiplexed signals to enhance transmission performance. Distributed acoustic sensors (DAS) use the same propagation medium ie. single mode optical fibre, and aims at comparable targets such as covering the highest distance with the best signal quality. In the case of sensors, a noiseless transmission enables to monitor a large quantity of mechanical events along the fibre. This paper aims at extending the perspectives of DAS systems with regard to technology breakthroughs introduced in long haul transmission systems over the last decade. We recently developed a sensor interrogation method based on coherent phase-sensitive optical time domain reflectometry (φ-OTDR), with dual polarization multiplexing at the transmitter and polarization diversity at the receiver. We name this technique Coherent-MIMO sensing. A study is performed from a dual-polarization numerical model to compare several sensor interrogation techniques, including Coherent-MIMO. We demonstrate that dual-polarization probing of a fibre sensor makes it insensitive to polarization effects, decreases the risks of false alarms and thus strongly enhances its sensitivity. The simulations results are validated with an experiment, and finally quantitative data are given on the performance increase enabled by Coherent-MIMO sensing.

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Section: Expectations On Sensing Qualitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Introducing Coherent MIMO Sensing, a fading-resilient, polarization-independent approach to phase-OTDR

Guerrier,

Dorize,

Awwad

et al. 2020

Preprint

Self Cite

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“…In order to boost SNR and increase maximum sensing length of the system, distributed Brillouin amplification 54,55 and distributed Raman amplification 56,57 are applied and more than 100 km sensing length is obtained. Pulse coding [58][59][60][61][62] and pulses compression techniques 63,64 are introduced into Φ-OTDR to achieve better SNR while maintaining spatial resolution, but the computation complexity is increased. The use of ultra-weak fiber Bragg grating (uwFBG) array 65,66 , or enhanced backscattering specialty fiber 67 can also raise the intensity level of RBS signal.…”

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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“…In [9], the multiplexer and the circulator have been used to divide two mode lights returned from a two-mode fiber and the phase extraction was successfully executed in each mode channel. In [10], two mutually orthogonal complementary pairs of Golay sequence together with the polarization diversity has been utilized to obtain the Jones matrix. Correspondingly, the phase information was acquired from the matrix.…”

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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Enhancing the performance of coherent OTDR systems with polarization diversity complementary codes

Cited by 38 publications

References 14 publications

Introducing Coherent MIMO Sensing, a fading-resilient, polarization-independent approach to phase-OTDR

Introducing Coherent MIMO Sensing, a fading-resilient, polarization-independent approach to phase-OTDR

Advances in phase-sensitive optical time-domain reflectometry

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

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