Optical fibers are made from cylindrical prefabricated rods, so the production process of optical fibers mainly consists of manufacturing cylindrical prefabricated rods and drawing process.
MCVD is currently the most widely used production process for preforms. BCI3 into a rotating high-purity silicon tube, which is maintained at a high temperature so that silicon and doping elements (Ge, B, etc.) react chemically in a controlled manner. The products of the reaction are uniformly deposited on the inner wall of the silicon tube, and the hollow silicon tube is gradually closed as deposition continues to occur.
SiCl+O2→SiO2+2Cl2↑ 4BCl3+ 3O2→2B2O3+6Cl2↑
The final deposition of the fiber core of the fiber, the oxidation reaction process is :
SiCl4+O2→SiO2+2Cl2↑ GeCl4+O2→GeO2+2Cl2
