Optical Glass Fibre and Light Transmission
topic
Optical glass fibres consist of a high-purity silica or doped silica core with refractive index of 1.47 to 1.50 surrounded by a lower-index cladding that confines light by total internal reflection, enabling signal transmission with attenuation below 0.2 decibels per kilometre at 1550 nanometre wavelength over transcontinental and submarine cable distances in telecommunications infrastructure.
Role
Forms the physical medium for global telecommunications and data transmission infrastructure, with optical fibre cables carrying the vast majority of internet, telephone, and broadcast data traffic at the speed of light with negligible signal degradation over thousands of kilometres, replacing copper conductors in long-distance and high-bandwidth communication network applications.