Measurement of radiation-induced attenuation in optical fibers by optical-time-domain reflectometry

1991 ◽  
Author(s):  
Larry D. Looney ◽  
Peter B. Lyons
Keyword(s):  
Optical Fibers ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Optical Time Domain Reflectometry ◽  
Radiation Induced ◽  
Optical Time

scholarly journals Analysis of Phase-Shift Pulse Brillouin Optical Time-Domain Reflectometry

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1497 ◽  
Author(s):  
Tsuneo Horiguchi ◽  
Yuki Masui ◽  
Mohd Zan
Keyword(s):  
Spectral Analysis ◽  
Phase Shift ◽  
Spatial Resolution ◽  
Optical Fibers ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Frequency Resolution ◽  
Optical Time Domain Reflectometry ◽  
Depth Analysis ◽  
Optical Time

Distributed strain and temperature can be measured by using local Brillouin backscatter in optical fibers based on the strain and temperature dependence of the Brillouin frequency shift. The technique of analyzing the local Brillion backscatter in the time domain is called Brillouin optical time domain reflectometry (BOTDR). Although the best spatial resolution of classic BOTDR remains at around 1 m, some recent BOTDR techniques have attained as high as cm-scale spatial resolution. Our laboratory has proposed and demonstrated a high-spatial-resolution BOTDR called phase-shift pulse BOTDR (PSP-BOTDR), using a pair of probe pulses modulated with binary phase-shift keying. PSP-BOTDR is based on the cross-correlation of Brillouin backscatter and on the subtraction of cross-correlations obtained from the Brillouin scatterings evoked by each phase-modulated probe pulse. Although PSP-BOTDR has attained 20-cm spatial resolution, the spectral analysis method of PSP-BOTDR has not been discussed in detail. This article gives in-depth analysis of the Brillouin backscatter and the correlations of the backscatters of the PSP-BOTDR. Based on the analysis, we propose new spectral analysis methods for PSP-BOTDR. The analysis and experiments show that the proposed methods give better frequency resolution than before.

scholarly journals Frequency scanned phase sensitive optical time-domain reflectometry interrogation in multimode optical fibers

APL Photonics ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 031302
Author(s):  
K. Markiewicz ◽  
J. Kaczorowski ◽  
Z. Yang ◽  
L. Szostkiewicz ◽  
A. Dominguez-Lopez ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Optical Time Domain Reflectometry ◽  
Phase Sensitive ◽  
Optical Time
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