Qibo Jiang

Research Project

Analysis of Coating Thickness Variation During Optical Fiber Manufacturing

During the mass production of silica-based optical fibers, a large fiber preform is softened in a high temperature furnace and is drawn to a small fiber with a diameter about 125 micrometers. The hot fiber exiting the furnace is cooled rapidly by the surrounding air or by blowing a gas, and is subsequently coated with a polymer layer to provide a protection of the fiber surface. The overall quality of the fiber depends on the uniformity of the coating layer, which is strongly influenced by the manufacturing conditions. While the average thickness of the coating layer is extensively investigated in the literature, the studies on the coating thickness fluctuation lack a sound fundamental basis. In this work, a linear perturbation analysis is adopted to predict the coating thickness variation under different processing conditions. An experimental correlation is developed to determine the initial amplitude of the thickness disturbance. Numerical results are presented for the first time to directly link the processing and geometric parameters with the coating thickness fluctuation in the final product. The results provide guidelines for selecting coating materials, system designs, and processing parameters to achieve uniform fiber coating layers.

Publications

1. Q. Jiang, F. Yang, and R. Pitchumani, “Analysis of Coating Thickness Variation During Optical Fiber Processing,” Journal of Lightwave Technology, 23(3), 1261–1272, 2005.
2. Q. Jiang, R. Pitchumani, A.M. Morales and L.A. Domeier, “Analysis of a Process for Replication of Electroforming Molds with Integral Microscreens,” Proceedings of the SPIE International Society for Optical Engineering 5342, 156, 2004.

Sponsor