A fiber optic cable is, at its most basic, a very thin, very pure strand of glass (or plastic) that guides light from one end to the other using a phenomenon called total internal reflection. A TOSLINK optical fiber cable with a clear jacket. These cables are used mainly for digital audio connections between devices. A fiber-optic cable, also known as an optical-fiber cable, is an assembly similar to an electrical cable but containing one or more optical fibers that are used to carry. This is the first in a series of five courses about fiber optic cable systems. The first course, Fiber Optics I –Theory, is an overview of the technology of fiber optic. Refraction, or the change in the direction of light as it changes speeds passing from one material into another, is a key component in fiber-optic transmission. That seemingly simple idea carries trillions of bits of data every second across the world's internet. Optical fibers are circular dielectric wave-guides that can transport optical energy and information.
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