Fiber optics is one of the most advanced and high-technology industry and it uses quartz for production of optical conductors. Abutment quartz tubes which are then used to spread finest fiber are made both from natural and synthetic quartz. The latter is essentially more expensive but its parameters allow to product waveguides for main feeds. Fiber for so-called “last mile” is ordinary produced from natural quartz.
Fiber cable works even under the conditions of forceful electromagnetic interference (a signal running through quartz fiber is without responding to them); and it is by far more light and cheap.
Besides from communication fiber optics is more and more widely used for medical use.