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[en] We have demonstrated an ultralong (up to 85 km in length) all-fibre Raman temperature sensor which utilises SMF-28 standard single-mode telecom fibre and a 1.63-μm probe signal source. The probe signal from the laser diode is amplified by a Raman fibre amplifier. The temperature along a 85-km-long fibre line has been measured with an accuracy of 8 °C and spatial resolution of 800 m or better. (laser applications and other topics in quantum electronics)
Journal
Quantum Electronics (Woodbury, N.Y.); ISSN 1063-7818; 
; v. 47(10); p. 967-970
; v. 47(10); p. 967-970