Multipoint Temperature Sensing Using Linear-Cavity Fiber Laser with an EDFA and FBGs

• Published in: 2021 IEEE International Conference on Sensors and Nanotechnology (SENNANO) pp. 5 - 8
• Main Authors: Hatanaka, Kengo, Kishikawa, Hiroki, Goto, Nobuo, Fujikata, Junichi, Yu, Yi-Lin, Liaw, Shien-Kuei, Sung, Jiun-Yu
• Format: Conference Proceeding
• Language: English
• Published: IEEE 22.09.2021
• Subjects: EDFA; FBG; Lasers; multi-point; Optical fiber amplifiers; optical fiber sensor; Optical fiber sensors; Power control; Sensitivity; temperature; Temperature measurement; Temperature sensors
• DOI: 10.1109/SENNANO51750.2021.9642539

Optical fiber sensors have been investigated to measure distributed distortion of large buildings, bridges and expressways. We are focusing on a fiber lasing system including sensing elements in the cavity since it has advantages such as higher resolution for wavelength shift and higher signal-to-noise ratio. A multipoint temperature sensor using linear-cavity lasing system consisting of an Erbium-doped fiber amplifier (EDFA), variable optical attenuators, and fiber Bragg grating elements is demonstrated. In order to obtain high-power and multi wavelength operation, an EDFA with appropriate power control is employed. As a result of two-point temperature measurement experiment, two-wavelength lasing and temperature-dependent wavelength change are observed. The sensitivity of 10.5 pm/deg is achieved.