Future fiber sensor device : vsible wavelength fber bagg grating

• Main Author: Teo, Hong Hee.
• Other Authors: Tjin Swee Chuan
• Format: Final Year Project
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: http://hdl.handle.net/10356/54198
• Institution: Nanyang Technological University

In this report, the research in the fabrication of Visible Wavelength Fiber Bragg Grating is presented. The scope of the research is to explore the possibility of a reproducible single mode visible wavelength FBG process. This area of interest is directed to the possible alternative of cost effective FBG sensors. In comparison to the current equipment used for FBG sensors, the equipment available in the visible wavelength is significantly lower [1]. The research explored the applications of the FBG sensor systems that are available commercially and also the current three mostly used available experimental fabricating processes for FBG [1]. The process of the fabrication was separated three main parts that is hydrogen loading, tapering process and grating process, with the research focused on the tapering and grating process. The tapering process is critical as based on the calculation for the 630nm visible wavelength source the single mode core size required is 4μm as opposed to the single mode communication fiber core is 8μm. The research was able to quantify the tapering slope angles to determine low loss conversion from multimode to single mode fiber [2] [3]. The research was also able to finalize the full fabrication process, with the Phase Mask method selected as the method to inscribe the gratings. The research was also able quantify simulation data and compared to the existing FBGs available. Although the fabrication of the visible wavelength FBG was not performed, the research was able to reach the prefabrication stage with all the data confirming the possibility of the single mode visible wavelength FBG is able to be produced.