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Updated: Aug 17, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
Multiwavelength Raman-fiber-laser-based long-distance remote sensor for simultaneous measurement of strain and
Young-Geun Han1, T V A Tran, Sang-Hyuck Kim
1Photonics Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-Dong, Seongbook-Gu, Seoul 136-791, South Korea. yyghan@kist.re.kr
Abstract:
We propose a simple and flexible multiwavelength Raman-fiber-laser-based long-distance remote-sensing scheme for simultaneous measurement of strain and temperature by use of fiber Bragg gratings. By combining two uniform fiber Bragg gratings with a tunable chirped fiber grating, we readily achieve simultaneous two-channel sensing probes with a high extinction ratio of more than approximately 50 dB over a 50-km distance. When strain and temperature are applied, lasing wavelength separation and shift occur, respectively, since the two uniform fiber Bragg gratings have identical material composition and different cladding diameters. This allows simultaneous measurement of strain and temperature for long-distance sensing applications of more than 50 km.
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