Detection of Refractive Index With a Temperature-Compensated MZI-Based Optical Sensor Using Few-Mode Fiber

Zuo, Binzhou; Liang, Xiao; Zhang, Xu-Ran; Yin, Tianhe

doi:10.1109/access.2021.3130371

Cited by 6 publications

(1 citation statement)

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“…A variety of optical fiber temperature or RI sensors, such as optical fiber interferometer sensor [1]- [4], surface plasmon resonance optical fiber sensor [5], and optical fiber grating sensor [6]- [9] have been developed. Among these optical fiber temperature and RI sensors, optical fiber sensors based on different coupling structures, such as single-mode fiber (SMF)-multimode fiber(MMF)-SMF structure [10], [11], SMF-tapered Bragg grating-SMF [12], [13], special optical fiber cascade [14], [15], fiber transverse offset splicing [16], and The authors are with the Department of Electronic and Communication Engineering, North China Electric Power University, Hebei Key Laboratory of Power Internet of Things Technology, Baoding, Hebei 071003, China (e-mail: 22456188@qq.com; 51550779@ncepu.edu.cn; 51551347@ncepu.edu.cn).…”

Section: Introductionmentioning

confidence: 99%

High Sensitivity Balloon-Like Sensor Based on Twin-Core and Twin-Hole Fiber

Zhang

Yao

2022

IEEE Photonics J.

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An all-fiber Mach-Zehnder interferometric (MZI) sensor for measuring temperature and refractive index (RI) is proposed and experimentally demonstrated. A high sensitivity balloon-like mode interferometer is fabricated with a twin-core and twin-hole fiber (TCTHF). The variations in ambient temperature and RI cause changes in phase differences between the modes, leading to shifts in the interference spectrum. The two resonance dip wavelength shifts within the spectrum are used to investigate the temperature and RI characteristics of the sensor. Experimental results show that the two dips have different responses to temperature and RI, indicating that the sensor can realize simultaneous measurement of temperature and RI. The obtained maximum sensing sensitivities are 0.051 nm/°C and 423.168 nm/RIU. The proposed sensor has potential applications in physical, biological, and chemical sensing owing to its high sensitivity, low cost, and small size.

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