Glass fibers / Glass optical fiber (GOF) are transmission media for data communication.
The glass fiber consists of a thin cylindrical fiber of quartz glass (SiO2), the core glass and the cladding glass around the core glass, which is also made of high-purity quartz glass. The glass fiber is protected by a coating which is applied over a layer of lacquer a few micrometers thick.
Glass fiber is characterized by high bandwidth, low attenuation and relatively good resistance to passive and active attacks. These include in particular resistance to electromagnetic interference (interference fields from machines, switches, lightning, transmitters, etc.) and light influences. The transferable data rates are many times higher than with copper wires.