Optical fiber production process
Optical fibers used in communications are generally silica fibers. The chemical name of quartz is silicon dioxide (SiO2), and it is the same main component as the sand we use to build our houses every day. However, optical fibers made of ordinary quartz materials cannot be used for communication. Communication fibers must be composed of extremely pure materials; however, incorporating small amounts of dopants into the host material can make the core and cladding slightly different in refractive index, which is beneficial for communication.
Optical fiber preform made by VAD method
There are many methods of manufacturing optical fibers, mainly including: in-tube CVD (chemical vapor deposition) method, in-rod CVD method, PCVD (plasma chemical vapor deposition) method and VAD (axial vapor deposition) method. But no matter which method is used, a preform Wholesale Fiber Optic Splice Closure must be made at a high temperature, then heated and softened in a high-temperature furnace, drawn into a filament, and then coated and overmolded to become an optical fiber core. The manufacture of optical fibers requires that each process be relatively precise and controlled by a computer. In the process of manufacturing optical fibers, pay attention to:
① The purity of optical fiber raw materials must be very high.
②Contamination of impurities and air bubbles must be prevented from entering the optical fiber.
③ To accurately control the distribution of refractive index;
④ Correctly control the structure size of the optical fiber;
⑤ Minimize the scratch damage on the surface of the optical fiber and improve the mechanical strength of the optical fiber.
pipe stick method
Insert the inner core glass rod into the outer glass tube (as close as possible), melt and wire;
double crucible method
In two concentric platinum crucibles, put the inner core and outer frit into the inner and outer crucibles respectively;
molecular filling method
The microporous quartz glass rod is immersed in the high refractive index additive solution to obtain the cross-sectional structure of the required refractive index distribution, and then the wire drawing operation is performed, and its process is relatively complicated. In optical fiber communication, internal and external vapor deposition methods can also be used to Wholesale Horizontal Type Fiber Optic Splicing Closure ensure that optical fibers with low optical loss rate can be produced.