Linear edge and temperature characteristic of tilted fiber Bragg gratings cladding-mode envelope |
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Authors: | Yin-ping Miao Bo Liu Kailiang Zhang Qi-da Zhao[Author vitae] |
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Affiliation: | aSchool of Electronics Information Engineering, Tianjin Key Laboratory of Film Electronic and Communication Device, Tianjin University of Technology, Tianjin 300384, China;bInstitute of Modern Optics, Nankai University, Tianjin 300071, China |
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Abstract: | In this paper, a system of linear edge filter demodulation based on weakly tilted fiber Bragg gratings in fiber sensor was proposed. The linear edge of the cladding-mode envelope and temperature characteristic between cladding modes and core mode of tilted fiber Bragg grating (TFBG) were experimentally investigated. The results show that falling edge (1505–1535 nm) and rising edge (1545–1565 nm) of the cladding-mode envelope is approximately linear and can be used as an edge filter. Moreover, the temperature characteristics of the core mode and cladding modes are similar to FBG’s. It can dynamically compensate the temperature induced wavelength shift of the FBG and the effect of temperature on the demodulated sensing signals is minimized. The advantages of this simple system are an all-fiber design, quasi static and dynamic operation, high stability and lower cost. |
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Keywords: | Optical fiber sensing Linear edge Dynamic-temperature compensating Tilted fiber Bragg grating (TFBG) |
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