Design and fabrication of optical fiber coatings for telecommunications
| Autor: | Ting-Ying Shen, 沈鼎瀛 |
|---|---|
| Rok vydání: | 2004 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 92 The design of double-coated optical fibers to minimize long-term tensile-force-induced and thermally-induced delamination of polymeric coatings from glass fibers are investigated using viscoelastic theory, as well as the effect of the temperature cycling on the static fatigue of double-coated optical fibers. To maintain the long-term reliability of polymer-coated optical fibers, the physical properties of polymeric coatings and their thicknesses should be properly selected. Alternatively, the design of hermetically double-coated optical fibers to minimize hydrostatic pressure induced stresses is investigated. These hydrostatic pressure induced stresses can be minimized by appropriately selecting material’s properties of hermetic coatings and their thicknesses. The stresses in optical fibers with some selected metallic coatings are also considered. The results show that the chromium has the best performance in the minimization of hydrostatic pressure induced stresses, but the chromium has strong oxidation tendency. However, lead and indium are the poor materials. Finally, optical fibers with hermetically metallic coatings have a higher long-term strength to resist water infiltration, so they have been extensively studied. In this experiment, the thermally induced stress voids and delamination in carbon-coated optical fibers are investigated. Nine samples of carbon-coated optical fibers with different coating structure and thickness are prepared using the plasma enhanced chemical vapor deposition method. After these fibers are coated with carbon coatings, thermally induced stress voids propagated along the fiber axial direction and the delamination are found. The carbon-coated optical fiber with coating thickness around 418nm and structure at H2/CH4 equaling to 3.33 induces the minimum numbers of stress voids and delamination. It obtains the optimal thickness and structure simultaneously. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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