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Research on All-Fiber FBG Sensor Based on Long-Period Fiber Grating Filter

Liu Yunqi\ Liu Heliang\ Liu Zhiguo\ Zhang Ying \ Dong Xiaoyi (Institute of Modern Optics, Nankai University, Tianjin\ 300071)  
Design a kind of all fiber sensing interrogation system, by using long period fiber grating as edge filter to interrogate the sensing signal of the FBG sensor. The wavelength sensitivity and wavelength resolution of the sensing measurement is 1.94 dB/nm and 0.05 nm, due to the measurement system with high signal noise ratio.
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