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

A temperature-compensated MZI-based optical sensor using few-mode concentric multilayer-core fiber (CMCF) was designed, and surrounding refractive index (SRI) sensing via interference spectra was successfully proposed and experimentally demonstrated. This sensor with sandwich structure generated lot...

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Bibliographic Details
Published in:IEEE access 2021, Vol.9, p.158651-158659
Main Authors: Zuo, Bin-Zhou, Liang, Xiao, Zhang, Xu-Ran, Yin, Tian-He
Format: Article
Language:English
Subjects:
cross sensitivity
Dual-mode fiber
fiber sensor
Interference
Multilayers
MZI
Optical fiber sensors
Optical measuring instruments
Parameter sensitivity
Refractive index
Refractivity
Resonance
Sandwich structures
Sensitivity
Sensors
Spectral sensitivity
Temperature compensation
Temperature measurement
Temperature sensors
temperature-compensated
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Summary:A temperature-compensated MZI-based optical sensor using few-mode concentric multilayer-core fiber (CMCF) was designed, and surrounding refractive index (SRI) sensing via interference spectra was successfully proposed and experimentally demonstrated. This sensor with sandwich structure generated lots of resonance dips in the interference spectra, which had differentiated sensitivities to SRI and temperature. The homemade CMCF only supported few mode groups, and variability of the resonance drift could be influenced by different mode excitation and sensitivity. For the two selected dips of this proposed sensor, the SRI sensitivities experimentally achieved were −76.88 and −50.51 nm per refractive index unit (RIU), and the temperature ones were 80.2 and 50.1 pm/°C, respectively. The experimental mechanism and results have been analyzed in brief. The standard matrix inversion method could be used for simultaneous two parameter determination. Therefore, the SRI detection could show good accuracy and sensitivity by temperature compensation.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2021.3130371