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Proceedings Paper

Novel all-fiber optic temperature sensors based on hollow optical fibers
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Paper Abstract

Novel all-fiber optic temperature sensors based on hollow optical fibers (HOFs) are presented. The HOFs with an air hole diameter of 8um at the center are fabricated through elaborate controls of MCVD and fiber drawing process. Two types of all-fiber temperature sensors are described. One is an all-fiber temperature sensor composed of a short HOF serially concatenated between a pair of long-period fiber gratings using a B/Ge-codoped core single mode fiber (SMF). The broadband pass-band tuning range of 84.3nm, covering both S and C band, is observed in the range from 25 to 215°C. Transmission peak is linearly shifted showing negative slope of -0.44nm/°C at 1500nm region. Its design, fabrication arts, and device integration are explained with characteristics of output filter spectrum and temperature tuning. The other is an in-line fiber etalon temperature sensor using a short HOF segment fusion-spliced between standard SMFs. This device is characterized in terms of wavelength shift according to temperature for HOFs with and without Ge-doped ring core. Temperature sensitivity of 3.38×10-5/°C and dynamic range of 20dB are observed over the range from 25 to 330°C at 1550nm. It is confirmed that the experimental results for both fiber optical sensors show a good agreement with theoretical analysis.

Paper Details

Date Published: 25 October 2004
PDF: 8 pages
Proc. SPIE 5602, Optomechatronic Sensors, Actuators, and Control, (25 October 2004); doi: 10.1117/12.571152
Show Author Affiliations
Sangsoo Choi, LG Electronics Inc. (South Korea)
Yongmin Jung, Gwangju Institute of Science and Technology (South Korea)
Tae-Jung Eom, Gwangju Institute of Science and Technology (South Korea)
Byeong Ha Lee, Gwangju Institute of Science and Technology (South Korea)
Kyunghwan Oh, Gwangju Institute of Science and Technology (South Korea)
Hyohyung Lee, LG Electronics Inc. (South Korea)
DaeHwa Jeong, LG Electronics Inc. (South Korea)


Published in SPIE Proceedings Vol. 5602:
Optomechatronic Sensors, Actuators, and Control
Kee S. Moon, Editor(s)

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