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Advances in Materials Science and Engineering
Volume 2015, Article ID 825238, 8 pages
Research Article

A Study on the Effect of the Contact Point and the Contact Force of a Glass Fiber under End-Face Polishing Process

1Department of Mechanical Engineering, Cheng Shiu University, Kaohsiung 833, Taiwan
2Department of Mechanical & Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan

Received 22 September 2014; Accepted 7 January 2015

Academic Editor: Aziz Dinia

Copyright © 2015 Ying-Chien Tsai et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The offset between the center lines of the polished end-face and the fiber core has a significant effect on coupling efficiency. The initial contact point and the contact force are two of the most important parameters that induce the offset. This study proposes an image assistant method to find the initial contact point and a mathematical model to estimate the contact force when fabricating the double-variable-curvature end-face of single mode glass fiber. The repeatability of finding the initial contact point via the vision assistant program is 0.3 μm. Based on the assumption of a large deflection, a mathematical model is developed to study the relationship between the contact force and the displacement of the lapping film. In order to verify the feasibility of the mathematical model, experiments, as well as DEFORM simulations, are carried out. The results show that the contact forces are alomst linearly proportional to the feed amounts of the lapping film and the errors are less than 9%. By using the method developed in this study, the offset between the grinding end-face and the center line of the fiber core is within 0.15 to 0.35 μm.