Intensity-Modulated Refractometer with Long-Period Fiber Gratings Near Turn-Around Point for Low Refractive Index Detection

We demonstrate a novel intensity-modulated refractometer based on long-period fiber gratings (LPFGs) in thin core fiber (TCF) near turn-around point. The correlation of contrast to surrounding refractive index (RI) for TCF-LPFGs with different index modulations in the low RI region was investigated....

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Bibliographic Details
Main Authors: Hua, Ziyang, Zhao, Yunhe, Wang, Wei, Tang, Mengxue, Liu, Yunqi, He, Zuyuan
Format: Conference Proceeding
Language:English
Subjects:
Correlation
Fiber gratings
intensity-modulated refractometer
long-period gratings
Modulation
Optical fiber networks
Refractive index
Sensitivity
Sensors
thin-core fiber
turn-around point
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Summary:We demonstrate a novel intensity-modulated refractometer based on long-period fiber gratings (LPFGs) in thin core fiber (TCF) near turn-around point. The correlation of contrast to surrounding refractive index (RI) for TCF-LPFGs with different index modulations in the low RI region was investigated. Compared with low index modulation, TCF-LPFGs with high index modulation have a larger sensing region and relatively higher sensitivity. With the index modulation of 4.5 x 10-4, a high sensitivity of -17.42 dB/ RIU and -163.32 dB/RIU was achieved in the RI region of 1.0-1.20 and 1.24-1.30, respectively. The proposed TCF-LPFGs based refractometer has potential application for low RI detection fields.
ISSN:2771-3059
DOI:10.1109/ICOCN55511.2022.9901178