Analysis of changes in optical splicing by use of quantitative fibers during arc-fusion phase imaging
NM Dragomir, E Ampen-Lassen, GW Baxter, P Pace, ST Huntington, PM Farrell, AJ Stevenson, A Roberts
MICROSCOPY RESEARCH AND TECHNIQUE | WILEY-BLACKWELL | Published : 2006
A non-interferometric imaging technique in conjunction with Abel inversion is used to directly and quantitatively examine the changes in optical fibers due to the heating produced during arc-fusion splicing as a function of fusion arc parameters. Phase images in the vicinity of a fusion splice are obtained using Quantitative Phase Microscopy, allowing the refractive-index change to be reconstructed with high spatial resolution. This simple, nondestructive method confirms that, for a fixed arc current, while the fusion time increases, the refractive-index of both fiber cores within the fusion region decreases in magnitude, the core region broadens, and the axial gradient decreases.