With an average coupling transmission efficiency of 77.3% and a maximum of 85%, the optical fiber cable system shows ... anti-resonant hollow-core fiber 2.79 μm Cr,Er:YSGG high-energy pulse ...

Fiber is also used to replace copper cable for LAN backbones. An optical fiber is constructed of a transparent core made of nearly pure silicon dioxide (SiO2), through which the light travels.