Doctoral Thesis Defense in “Optics and Photonics” by Mr. Paul Stone MACHESO

The Euromed University of Fes (UEMF) is pleased to inform the public of

The doctoral thesis defense in “Optics and Photonics”

The thesis defense will take place on September 15, 2025 at 3 p.m. at UEMF 

Location: The Incubator (LOC 001994)

The thesis will be presented by Mr. Mr. Paul Stone MACHESO

under the topic:

“Design of Optical Fiber Sensors Using the Fiber Bragg Grating Technique for the Fourth Industrial Revolution”

Abstract 

Fiber Bragg grating (FBG)-based sensing technology has become a game-changing solution in a variety of industrial, military, aerospace and civil engineering applications. Because of their small size, ability to sense at multiple locations, and tolerance to electromagnetic interference, FBG sensors are highly valued and ideal for settings where conventional sensors are less effective. This study investigates the use of FBG-based sensors for vital physical parameters, especially in harsh and dynamic environments, such as strain, temperature and pressure. FBG sensors integrated into a single optical fiber provide notable benefits in terms of system scalability, cost-effectiveness and simplicity, particularly for large-scale structures. By optimizing sensor design using Finite Difference Time Domain (FDTD), improving strain and temperature sensing, and exploring their potential in smart factories and Internet of Things applications, this work advances FBG sensor technology and ultimately pushes the limits of sensor performance in next-generation industrial systems, the Fourth Industrial Revolution and beyond. Furthermore, a comparison of the performance of single-mode and multimode fiber Bragg grating sensors (MMFBG) for temperature monitoring is carried out to improve understanding of how the grating's geometrical characteristics affect the transmission spectrum of these sensors. Additionally, in order to improve the sensitivity of MMFBG sensors and make them more suitable for temperature sensing applications, we propose a unique design that combines phase-shifted and tilted grating.

Keywords : Finite Difference Time Domain, Temperature, Strain, Fiber Bragg Grating, Sensor, Wavelength, Industrial 4.0
 

This thesis will be presented to the jury members: