High-sensitivity refractive index sensor based on FMF-CLF-FMF optical fiber structure

ZHANG Jing; LI Yongqian

doi:10.5768/JAO202344.0208002

Journal of Applied Optics > 2023 > 44(2): 462-468. > DOI: 10.5768/JAO202344.0208002

ZHANG Jing, LI Yongqian. High-sensitivity refractive index sensor based on FMF-CLF-FMF optical fiber structure[J]. Journal of Applied Optics, 2023, 44(2): 462-468. DOI: 10.5768/JAO202344.0208002

Citation:

ZHANG Jing, LI Yongqian. High-sensitivity refractive index sensor based on FMF-CLF-FMF optical fiber structure[J]. Journal of Applied Optics, 2023, 44(2): 462-468. DOI: 10.5768/JAO202344.0208002

Citation:

ZHANG Jing, LI Yongqian. High-sensitivity refractive index sensor based on FMF-CLF-FMF optical fiber structure[J]. Journal of Applied Optics, 2023, 44(2): 462-468. DOI: 10.5768/JAO202344.0208002

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High-sensitivity refractive index sensor based on FMF-CLF-FMF optical fiber structure

ZHANG Jing^{1, 2,},
LI Yongqian^{1, 2}

1.
Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China
2.
Hebei Key Laboratory of Power Internet of Things Technology, Baoding 071003, China

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Received Date: June 05, 2022
Revised Date: July 19, 2022
Available Online: January 17, 2023

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Abstract

Abstract

Optical fiber refractive index sensor is widely used for monitoring in various complex environments. A high-sensitivity refractive index sensor based on the structure of few-mode fiber (FMF)-coreless fiber (CLF)-FMF was designed, and the experimental verification was carried out. The sensor consisted of a thinned section of CLF fused between two small sections of FMF to form a Mach-Zehnder interferometer (MZI) for measuring external refractive index, and the fiber Bragg grating (FBG) was used for temperature compensation. The resonance trough of interference spectrum generated by MZI structure was affected by both refractive index and temperature, while FBG was only affected by temperature. The sensitivity matrix was constructed by using the refractive index and temperature sensitivity coefficients of MZI and FBG to realize the simultaneous measurement of refractive index and temperature. Experimental results show that the refractive index sensitivity of MZI is 345.66 nm/RIU, and the temperature sensitivity is 0.0134 nm/℃. Meanwhile, the temperature sensitivity of FBG is 0.0104 nm/℃.
- refractive index measurement,
- coreless fiber,
- temperature measurement,
- few-mode fiber

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References (25)

References

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High-sensitivity refractive index sensor based on FMF-CLF-FMF optical fiber structure