Yeon-Gwan Lee/Byeong-Wook Jang/in-Hyuk Kim/Yoon-Young Kim/Chun-Gon Kim
International Journal of Aeronautical and Space Sicences, vol. 12, no. 2, pp.175-178, 2011

Abstract : This paper presents a technique to measure an optical fiber-based beam width. The proposed system is aimed for applications in the optical fiber industry such as lensed fiber, optical fiber based laser beam source, and fiber optic sensor. The measurement system is composed of optical fiber, which is used for transceiver, and a single grating panel which consists of a multi-reflection area with an even non-reflection area. The grating panel is used for variation of the reflected light. When the widths of the reflection area and non-reflection area are larger than the optical beam width, the reflected light is varied at the interface between the reflection area and the non-reflection area by the movement of the grating panel. In order to verify the feasibility of the proposed technique, experiments were carried out. For the experiments, multi-mode fiber combined with a collimator was selected as an emitter and a receiver, and the beam width measurement system adequate for the purpose of this study was contrived. Consequently, the proposed method and system were verified through comparison with the results of the conventional charge-coupled device (CCD) technique.

Keyword : optical fiber, beam width, grating panel, reflection area, non-reflection area, CCD