MIT’s Technology Review has a beautiful photo essay from the Corning plant where fiber optic cables are made.
From: Light Factory
Low-loss optical fibers created by researchers at Corning Glass Works in 1970 are what made possible the Internet as we know it. These ultrathin solid glass structures transmit data in the form of light pulses, carrying everything from phone calls to streaming video. Corning remains the world’s largest manufacturer of optical fiber.