Highly sensitive bend sensor based on Mach-Zehnder interferometer using photonic crystal fiber |
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| Authors: | Ming Deng Chang-Ping Tang Yun-Jiang Rao |
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| Institution: | a Key Laboratory of Optoelectronic Technology and Systems (Education Ministry of China), Chongqing University, Chongqing 400044, Chinab Key Lab of Broadband Optical Fiber Transmission & Communication Networks Technologies (Education Ministry of China), University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China |
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| Abstract: | Optical fiber bend sensor with photonic crystal fiber (PCF) based Mach-Zehnder interferometer (MZI) is demonstrated experimentally. The results show that the PCF-based MZI is sensitive to bending with a sensitivity of 3.046 nm/m−1 and is independent on temperature with a sensitivity of 0.0019 nm/°C, making it the best candidate for temperature insensitive bend sensors. To that end, another kind of bend sensor with higher sensitivity of 5.129 nm/m−1 is proposed, which is constructed by combining an LPFG and an MZI with zero offset at the second splice mentioned above. |
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| Keywords: | Fiber-optic sensors Mach-Zehnder interferometer Photonic crystal fiber Bend measurement |
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