... optical glass silicon compounds The geometry and coordinate system for the neck-down region in the furnace are shown in Fig. 1 . The flow in the furnace is separated into the three regions of the central cavity, the glass layer and the external gas region by two neck-down profiles r = R 1...

... . The neck-down profile strongly depends on the fiber-drawing conditions and significantly impacts the diameter uniformity, strength, and transmission loss of optical fibers 2 3 . optical fibre fabrication flow instability temperature distribution resistance furnaces wire drawing optical...