Curvature measurement by using low-birefringence photonic crystal fiber based Sagnac loop |
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| Authors: | HP Gong CC Chan P Zu XY Dong |
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| Institution: | a Institute of Optoelectronic Technology, China Jiliang University, Xueyuan Street, Xiasha High Education Zone, Hangzhou 310018, China
b Division of Bioengineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637457, Singapore |
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| Abstract: | An optical fiber curvature sensor with low-birefringence photonic crystal fiber (PCF) based Sagnac loop is demonstrated experimentally. The low-birefringence PCF of about 40 cm long is inserted into Sagnac loop, and a section of it about 155 mm is used as the sensing element. The Sagnac output spectra under different curvatures are measured and analyzed. The results show that the wavelength shift of the transmission dip has a linear relationship with the curvature. The sensitivity of the curvature measurement of − 0.337 nm is achieved in the range of 0-9.92 m− 1. And the temperature effect of the proposed sensor is also analyzed. |
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| Keywords: | Photonic crystal fiber Sagnac interferometer Curvature sensor |
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