A cheap and practical FBG temperature sensor utilizing a long-period grating in a photonic crystal fiber |
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| Authors: | Chun-Liu Zhao MS Demokan Limin Xiao |
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| Institution: | a Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
b School for Information and Optoelectronics Science and Engineering, South China Normal University, Guangzhou, China |
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| Abstract: | A whole temperature sensor in one package utilizing a fiber Bragg grating (FBG) made in a conventional single-mode fiber and which uses a long-period grating (LPG) made in a photonic crystal fiber is proposed and experimentally demonstrated. The function of the interrogation is that the wavelength change of the FBG with environmental temperature is transferred to the intensity of the output via the LPG. Utilizing the temperature-insensitivity of the LPG in the PCF, the interrogation is stable and enables a cheap and practical temperature measurement system with a wide dynamic range. |
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| Keywords: | Fiber Bragg grating Fiber sensor Interrogation Long-period grating Photonic crystal fiber |
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