The Institute of Laser for Postgraduate Studies discusses a PhD dissertation addressing the study of the fabrication and testing of an innovative Hetero-Core optical fiber structure, which functions as a Mach–Zehnder Interferometer (MZI). This structure was precisely constructed by splicing No-Core Fibers (NCF) and Thin-Core Fibers (TCF) within Single-Mode Fibers (SMF).
The PhD dissertation submitted by student Wijdan Mahmoud Khudhair, entitled _”Hetero-Core Optical Fiber Biosensor Integrated with Erbium-Doped Fiber Laser”, and it was supervised by Prof. Dr. Abdul Hadi Mutashar Al-Janabi and Asst. Prof. Dr. Sara Kadhim Mohsen.
The study proved that using the “In-cavity” technique integrated with an Erbium-Doped Fiber Laser (EDFL) achieved superior sensitivity compared to conventional sensing methods. The sensor demonstrated high efficiency in detecting concentrations of Bovine Serum Albumin (BSA), saline solution, and sucrose, achieving very low limits of detection (LOD) down to 0.022 mg/mL.
The proposed design provides an economical solution characterized by simplicity, stability, and repeatability, making it an ideal platform for developing a new generation of tunable biomedical sensors. This research represents an advanced step in integrating fiber laser technologies with optical sensing systems to serve precise medical and engineering applications.
