Journal ArticleDOI
Characteristics and reduction of coherent fading noise in Rayleigh backscattering measurement for optical fibers and components
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TLDR
In this paper, the effects of frequency shift averaging on fading noise reduction are clarified theoretically, and the relationships between measurement accuracy and other parameters, such as spatial resolution and frequency variation range, are derived.Abstract:
The characteristics of fading noise in Rayleigh backscattering measurements made with coherent lightwaves such as in coherent-OTDR (optical time-domain reflectometry) and coherent-OFDR (optical frequency-domain reflectometry) are studied. The effects of frequency shift averaging on fading noise reduction are clarified theoretically, and the relationships between measurement accuracy and other parameters, such as spatial resolution and frequency variation range are derived. The calculated results of loss measurement accuracy are in good agreement with experimental data. The formula can also be applied to low-coherence interferometric OTDR. >read more
Citations
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Journal ArticleDOI
Experimental and theoretical investigations of coherent OFDR with semiconductor laser sources
TL;DR: In this article, the effects of mode hopping in the optical-frequency sweep are compared to numerical simulations and a simple formula to predict the position of spurious peaks due to mode hopping is presented.
Journal ArticleDOI
Phase-detection distributed fiber-optic vibration sensor without fading-noise based on time-gated digital OFDR
Dian Chen,Qingwen Liu,Zuyuan He +2 more
TL;DR: A novel phase-detection DFVS is developed, which effectively eliminates the weak-fading-point and the relationship between phase noise and the intensity of backscattering is analyzed, and the inner-pulse frequency-division method and rotated-vector-sum method are introduced to effectively suppress phase noise.
Journal ArticleDOI
Interferometric optical time-domain reflectometry for distributed optical-fiber sensing.
TL;DR: It is shown that the spatial distribution along the fiber of an external phase modulation can be measured with a spatial resolution close to that of optical time-domain reflectometry.
Journal ArticleDOI
Distributed Optical Fiber Sensing Based on Rayleigh Scattering
Luca Palmieri,Luca Schenato +1 more
TL;DR: In this paper, the authors focus on Rayleigh-based distributed optical fiber sensors, which are based on the scattering processes that originate from the interaction between light and matter, and provide unprecedented features, such as the ability of monitoring varia- tions of the observed physical field with spatial continuity along the fiber.
Journal ArticleDOI
Characteristics and Explanations of Interference Fading of a $\phi $ -OTDR With a Multi-Frequency Source
TL;DR: The characteristics of interference fading in a phase sensitive optical time domain reflectometer (φ-OTDR) system with a three optical frequency source are described in this paper, where the fading appearance is quite stable over 400 different pulse scans for each of frequencies, but different for the three frequencies.
References
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Book
An introduction to the theory of random signals and noise
TL;DR: The aim of this book is to clarify the role of noise in the development of linear and nonlinear systems and to provide a procedure forormalising the noise generated by these systems.
Journal ArticleDOI
Optical coherence-domain reflectometry: a new optical evaluation technique.
TL;DR: An optical evaluation technique is described that is suitable for determining the positions and magnitudes of reflection sites within miniature optical assemblies using the coherence effects exhibited by a broadband optical source and is referred to as optical coherence-domain reflectometry.
Journal ArticleDOI
Fading in heterodyne OTDR
TL;DR: In this article, the first and second-order statistics of the Rayleigh backscatter signal from a singlemode fiber under quasimonochromatic pulse excitation were derived.
Journal ArticleDOI
Modified optical frequency domain reflectometry with high spatial resolution for components of integrated optic systems
H. Barfuss,E. Brinkmeyer +1 more
TL;DR: In this paper, a modified optical frequency domain reflectometry (OFDR) technique was used to detect scatterers and faults as well as measurement of reflections in fiber or integrated optic devices and systems with a spatial resolution in the region of 10-100 mu m. The dynamic range is sufficient to detect reflection with a reflection coefficient down to 10/sup -10/.
Journal ArticleDOI
High-resolution OCDR for testing integrated-optical waveguides: dispersion-corrupted experimental data corrected by a numerical algorithm
TL;DR: In this article, a numerical algorithm is presented and applied to dispersion-corrupted experimental data taken by coherence domain reflectometric (OCDR) measurements, which results in a retrieval of micrometer resolution and an enhanced dynamic range.