Sensitivity Modal Analysis of Long Reflective Multimode Interferometer for Small Angle Detection and Temperature

This work presents the sensitive modal analysis of a long reflective multimode optical fiber device for angle and temperature. The reflective multimode interference optical fiber device was fabricated by splicing ~40 cm of multimode optical fiber (50/125). This structure provides a random interferen...

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Bibliographic Details
Published in:Photonics 2023-07, Vol.10 (7), p.706
Main Authors: Lozano-Hernandez, Tania, Estudillo-Ayala, Julian M., Jauregui-Vazquez, Daniel, Sierra-Hernandez, Juan M., Rojas-Laguna, Roberto
Format: Article
Language:English
Subjects:
Analysis
angle detection
Equipment and supplies
Fiber optics
Fourier transforms
Interference
interferometer
Modal analysis
multimode
optical fiber
Optical fibers
Propagation
Sensitivity analysis
Sensors
Signal analysis
Thermal analysis
Wave reflection
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Summary:This work presents the sensitive modal analysis of a long reflective multimode optical fiber device for angle and temperature. The reflective multimode interference optical fiber device was fabricated by splicing ~40 cm of multimode optical fiber (50/125). This structure provides a random interference reflection spectrum; the wavelength sensitivity analysis indicates that estimating the angle detection is impossible due to the several modes involved. However, by the phase analysis of the Fourier components, it was possible to detect slight angle deflection. Here, three spectral Fourier components were analyzed, and the maximal sensitivity achieved was 1.52 rad/°; the maximal angle variation of the multimode fiber was 3.4°. In addition, the thermal analysis indicates minimal temperature affectation (0.0065 rad/°C). Moreover, it was demonstrated that there is a strong dependence between the sensitivity and the m-order of the modes involved. Considering the fiber optic sensor dimensions and signal analysis, this device is attractive for numerous applications where slight angle detection is needed.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics10070706