Hardware Secrets published an introduction to Optical Fibers

In 1952 physicist Narinder Singh Kapany, based on studies conducted by english physicist John Tyndall that the light could travel in curve inside a material (in Tyndall's experiment this material was water), could conclude his experiments that led to the invention of the optical fiber. Optical fiber is an excellent transmition medium used by systems that require a high bandwidth, like the telephony systems, videoconference, local networks (LANs), etc.

Introduction to Optical Fibers