Han, YG Tran, TVA Kim, SH Lee, SB 2024-01-21T04:43:02Z 2024-01-21T04:43:02Z 2021-09-03 2005-06-01 0146-9592 https://pubs.kist.re.kr/handle/201004/136370 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 similar to 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. (c) 2005 Optical Society of America English OPTICAL SOC AMER GRATING SENSORS BRAGG GRATINGS Multiwavelength Raman-fiber-laser-based long-distance remote sensor for simultaneous measurement of strain and temperature Article 10.1364/OL.30.001282 1 OPTICS LETTERS, v.30, no.11, pp.1282 - 1284 OPTICS LETTERS 30 11 1282 1284 scie scopus 000229259500010 2-s2.0-20444433081 Optics Optics Article GRATING SENSORS BRAGG GRATINGS Fiber optics Fiber optics sensors