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http://dx.doi.org/10.3807/KJOP.2018.29.6.241

Fiber Bragg Grating Temperature Sensor by the Wavelength Tuning Using the Temperature Dependence of VCSEL  

Lee, Chung-Ki (Research and Development Fivetech Co., Ltd.)
Kim, Sung-Moon (Dept. of Electronics Engineering, Pusan National University)
Publication Information
Korean Journal of Optics and Photonics / v.29, no.6, 2018 , pp. 241-246 More about this Journal
Abstract
In this paper, a low-cost optical temperature sensor is implemented, using a fiber Bragg grating (FBG) as the temperature probe and a low-cost VCSEL with temperature-dependent output wavelength as the light source. To analyze the wavelength of the reflected light from the FBG, an interrogation was applied using a method of referring to the internal temperature according to the output wavelength of the VCSEL. When the temperature of the VCSEL was adjusted from 14 to $52.2^{\circ}C$, the output wavelength varied from 1519.90 to 1524.25 nm. The degree of wavelength tuning according to temperature was $0.114nm/^{\circ}C$. The variable wavelength repeatability error according to temperature was ${\pm}0.003nm$, and the temperature measurement error was ${\pm}0.18^{\circ}C$. As a result of measuring the temperatures from 22.3 to $194.2^{\circ}C$, the value of the internal temperature change of the light source according to the applied temperature ${\Delta}T$ was $0.146^{\circ}C/{\Delta}T$, the change in reflected wavelength of the temperature probe according to applied temperature ${\Delta}T$ was measured at $16.64pm/^{\circ}C$. and the temperature measurement error of the sensor was ${\pm}1^{\circ}C$.
Keywords
Fiber-optic temperature sensor; Fiber Bragg grating; Vertical cavity surface emitting laser;
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