Abstract
The property and compatibility between fiber Bragg grating (FBG) and back-scattering signals are investigated by employing optical time domain reflectometry. We compare the power spectrums of spontaneous Brillouin scattering (SpBS), simultaneous Brillouin scattering (SBS) and Rayleigh scattering (RS), and coupling mechanism between FBG and back-scattering signal is explored. Experimental results show that the region of FBG contributes to the backscatter power and causes the desired reflection, and the power peak of FBG in SBS power spectrum is the sharpest among back-scattering light power spectrums and broadens with the decrease of spatial resolution. Moreover, the FBG-based method is used to find the location of temperature or stain event for scatter-based distributed sensors.
Highlights
In recent years, distributed optical sensing techniques have been one of the most vibrant fields of research for health structural monitoring.[1,2,3] Distributed sensing with meter and sub-meter spatial resolution along several tens of kilometers has been demonstrated.[4]
The roof of the peaks indicates that the shape is the sum of the reflected signal from fiber Bragg grating (FBG) and the backscatter signal
Why is the reflected power peak wider compared to sharp power peak of stimulated Brillouin scattering (SBS) when the same pulse is used in Rayleigh scattering (RS) measurement? It could be considered that the sharp shape is caused by the SBS signal filtered at the window of Brillouin frequency, and the shape and magnitude of RS cover entire pump light wavelength range
Summary
In recent years, distributed optical sensing techniques have been one of the most vibrant fields of research for health structural monitoring.[1,2,3] Distributed sensing with meter and sub-meter spatial resolution along several tens of kilometers has been demonstrated.[4] These include techniques based on Raman, stimulated Brillouin scattering (SBS), spontaneous Brillouin scattering (SpBS), and Rayleigh scattering (RS) as well as those involving multiplexed fiber Bragg gratings (FBGs).[4,5,6] This is an Open Access article published by World Scientific Publishing Company. Further distribution of this work is permitted, provided the original work is properly cited. ∗Corresponding author
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