Low-Loss Random Fiber Gratings Made With an fs-IR Laser for Distributed Fiber Sensing

By using the plane-by-plane grating inscription method with an fs-IR laser, random fiber gratings with low laser-induced loss were fabricated in SMF-28 fiber for distributed temperature sensing. Compared to conventional random gratings having broadband backscattering enhancement, the demonstrated ra...

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Bibliographic Details
Published in:Journal of lightwave technology 2019-09, Vol.37 (18), p.4697-4702
Main Authors: Lu, Ping, Mihailov, Stephen J., Coulas, David, Ding, Huimin, Bao, Xiaoyi
Format: Article
Language:English
Subjects:
Backscatter
Backscattering
Broadband
Fiber gratings
Fiber lasers
Fiber optics sensors
Gratings
Gratings (spectra)
Lasers
Optical fiber networks
Optical fiber sensors
Optical fibers
Optical frequency
rayleigh
Reflectometry
scattering
Temperature measurement
ultrafast lasers
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Summary:By using the plane-by-plane grating inscription method with an fs-IR laser, random fiber gratings with low laser-induced loss were fabricated in SMF-28 fiber for distributed temperature sensing. Compared to conventional random gratings having broadband backscattering enhancement, the demonstrated random fiber grating has a well defined narrower bandwidth of backscattering enhancement, higher laser-induced backscattering level, and lower laser-induced loss, which are critical for long-haul distributed fiber sensor systems with high measurement accuracy. Experimental results showed that by using fabricated random fiber gratings along with the technique of optical frequency-domain reflectometry, a distributed temperature fiber sensor could be realized having a gauge length of 10 mm, standard deviation of temperature measurement as low as 0.00085 °C, and laser-induced loss of 0.08 dB/m.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2019.2917389