Statistical properties of backscattered semiconductor laser radiation with different degrees of coherence

Alekseev, Alexey E.; Tezadov, Ya. A.; Потапов, В. Т.

doi:10.1070/qe2012v042n01abeh014719

Cited by 13 publications

(17 citation statements)

References 2 publications

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“…The dispersion of the intensity (11) over the ensemble {ρ} is defined as a statistical average of the products of intensities taken for different realizations ρ minus the square of the mean intensity (13). This value defines the deviation of random backscattered intensity from the mean value (13) on transition from one statistical realization {ρ} to another.…”

Section: Contrastmentioning

confidence: 99%

“…The theory of high-coherence OTDR is developed in numerous works, for instance [7][8][9][10][11][12][13][14]. Low-coherence OTDR has some features that are disclosed in the next section.…”

Section: Introductionmentioning

confidence: 99%

“…Such a consideration was first made in [7][8][9]. Next, a detailed description of the statistical properties of the backscattered light in a single-mode optical fiber was given in [10][11][12][13], where it was assumed that the spectral line of the light source has a Lorentzian profile. In addition, the probe pulse was assumed to have a rectangular shape in time.…”

Section: Introductionmentioning

confidence: 99%

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Distributed stress and temperature sensing based on Rayleigh scattering of low-coherence light

Gorshkov

Taranov²,

Alekseev

2017

Laser Phys.

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A novel arrangement for fiber optic distributed stress and temperature sensing based on the Rayleigh scattering spectra correlation method is proposed. The principal feature of the arrangement is usage of low-coherence light in probe pulses, which ensures a wide dynamic range for measurements at moderate sensitivity. Such a characteristic corresponds to performance specifications for infrastructure monitoring systems. A theory of optical time domain reflectometry for arbitrary coherence light is developed describing the contrast in reflectograms and Rayleigh scattering spectra properties. The experimental setup uses a wideband source of light pulses and an electronically controlled micro-electro-mechanical system optical filter for wavelength tuning. Temperature change experiments show root mean square (RMS) noise levels of 0.13 °C, 0.24 °C and 0.3 °C for fiber lengths of 2 km, 8 km and 25 km, respectively, at a spatial resolution of about 1 m (for 10 min data collection). As much as 2000 µstrain dynamic range is demonstrated in the stress measurement experiment while the noise level (RMS error) is estimated to be 2 µstrain. Our experimental results are compared with the theory and a satisfactory match is demonstrated.

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Section: Contrastmentioning

confidence: 99%

“…The theory of high-coherence OTDR is developed in numerous works, for instance [7][8][9][10][11][12][13][14]. Low-coherence OTDR has some features that are disclosed in the next section.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distributed stress and temperature sensing based on Rayleigh scattering of low-coherence light

Gorshkov

Taranov²,

Alekseev

2017

Laser Phys.

Self Cite

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“…Due to the random density fluctuations caused by limitations in the fiber fabrication, Rayleigh scattering occurs at statistically independent spatial positions along the fiber from the input (z 0 ) to the open port (z L ), and only a fraction of the scattered light is recaptured by the fiber at scattering angles close to π compared to that propagating in the opposite direction. It is worth mentioning that the instantaneous Rayleigh scattering amplitude at each scatter section fluctuates randomly in time, with a Gaussian distribution [18][19][20] . A backscattering coefficient Δρ (z i ) is used to measure the fraction of the scattered field from a section, and the coefficient Δρ(z i ) is a time-independent zeromean circular complex Gaussian random variable.…”

Section: Resultsmentioning

confidence: 99%

Broadband random optoelectronic oscillator

Hao

Capmany

et al. 2020

Nat Commun

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Random scattering of light in transmission media has attracted a great deal of attention in the field of photonics over the past few decades. An optoelectronic oscillator (OEO) is a microwave photonic system offering unbeatable features for the generation of microwave oscillations with ultra-low phase noise. Here, we combine the unique features of random scattering and OEO technologies by proposing an OEO structure based on random distributed feedback. Thanks to the random distribution of Rayleigh scattering caused by inhomogeneities within the glass structure of the fiber, we demonstrate the generation of ultra-wideband (up to 40 GHz from DC) random microwave signals in an open cavity OEO. The generated signals enjoy random characteristics, and their frequencies are not limited by a fixed cavity length figure. The proposed device has potential in many fields such as random bit generation, radar systems, electronic interference and countermeasures, and telecommunications.

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“…In general, quality of sensing systems for remote monitoring of extended objects is determined by its ability to detect perturbations caused by an activity near the sensor fiber within a background, where this background is formed both by external noises (e.g., seismic noises) and self-noises of the system. In order to maximize the rate of recognized (i.e., detected and classified) perturbations, Φ-OTDR based sensors have been studied throughout via numerical simulations [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Laser Frequency Drift in Phase-Sensitive Optical Time Domain Reflectometry

Zhirnov¹,

Stepanov²,

Chernutsky³

et al. 2019

Opt. Spectrosc.

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The present work studies the influence of laser frequency drifts on operating of phase-sensitive optical time-domain reflectometry (Φ-OTDR) fiber sensors. A mathematical model and numerical simulations are employed to highlight the influence of frequency drifts of light sources on two characteristic scales: large-time (minutes) and short-time (milliseconds) frequency drifts. Numerical simulation results are compared with predictions given by the fluctuation ratio coefficient (FRC), and they are in a qualitative agreement. In addition to qualitative criteria for light sources given by the FRC, quantitive requirements for optimal light sources for Φ-OTDR sensors are obtained. Numerical simulation results are verified by comparison with experimental data for three significantly different types of light source.

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Statistical properties of backscattered semiconductor laser radiation with different degrees of coherence

Cited by 13 publications

References 2 publications

Distributed stress and temperature sensing based on Rayleigh scattering of low-coherence light

Distributed stress and temperature sensing based on Rayleigh scattering of low-coherence light

Broadband random optoelectronic oscillator

Influence of the Laser Frequency Drift in Phase-Sensitive Optical Time Domain Reflectometry

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