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A Temperature-Insensitive Twist Sensor by Using Low-Birefringence Photonic-Crystal-Fiber-Based Sagnac Interferometer

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7 Author(s)
Peng Zu ; Sch. of Chem. & Biomed. Eng., Nanyang Technol. Univ., Singapore, Singapore ; Chi Chiu Chan ; Yongxing Jin ; Tianxun Gong
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An optical fiber twist sensor is proposed by using solid core low birefringence photonic crystal fiber (LB-PCF)-based Sagnac interferometer. The twist effects on the fiber are theoretically analyzed. The results show that the dip wavelength of the transmission spectrum shifts with the twist angle with a high sensitivity and resolution of 1.00 nm/0 and 0.010 , respectively. The sensor is also insensitive to environmental temperature change with an ultralow thermal dependent coeffiecient of -0.5 pm/0C.

Published in:

Photonics Technology Letters, IEEE  (Volume:23 ,  Issue: 13 )