Demonstration of Improving the Performance of a Fibre Optic Displacement Sensor Using the Optical Harmonic Vernier Effect by Cascading Tapered Optical Single-Mode Fibres

An experimental demonstration for generating harmonics in the optical Vernier effect (OVE) by cascading tapered single-mode fibres (SMF28) is presented. The tapered optical fibres conformed to a pair of in-series Mach-Zehnder fibre interferometers (MZFI), in which one MZFI was a reference while the...

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Bibliographic Details
Published in:IEEE photonics journal 2023-10, Vol.15 (5), p.1-9
Main Authors: Guillen-Ruiz, L., Anzueto-Sanchez, G., Martinez-Rios, A., Camas-Anzueto, J., Nunez-Gomez, R. E., Martin-Vela, J. A.
Format: Article
Language:English
Subjects:
Displacement sensor
free spectral range
harmonic
Harmonic analysis
Harmonics
Mach-Zehnder
magnification
Nonlinear optics
Optical fiber sensors
Optical fibers
Optical harmonic generation
Optical interferometry
optical vernier effect
Sagnac interferometers
Sensitivity
taper
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Summary:An experimental demonstration for generating harmonics in the optical Vernier effect (OVE) by cascading tapered single-mode fibres (SMF28) is presented. The tapered optical fibres conformed to a pair of in-series Mach-Zehnder fibre interferometers (MZFI), in which one MZFI was a reference while the other was a sensor. The first-order harmonic was achieved by increasing the distance between tapers of the sensor MZFI by a multiple of (i + 1) times the distance between tapers of the reference MZFI plus a mismatch factor. A series of experiments using an individual MZFI and two MZFIs with traditional and harmonic OVE as displacement sensors were performed to compare their sensitivities and magnification factors and demonstrate the improving the sensitivity. The displacement sensor with the first-order harmonic exhibited a maximum sensitivity of −33.3 nm/mm with an M-factor of 8.53 in the mm range.
ISSN:1943-0655
1943-0655
1943-0647
DOI:10.1109/JPHOT.2023.3303083