- A fiber optic cable is a network cable that contains strands of glass fibers inside an insulated casing.
- These cables are designed for long distance and very high bandwidth (gigabit speed) network communications.
- Light travels down a fiber-optic cable by bouncing repeatedly off the walls.But if light hits glass at a really shallow angle (less than 42 degrees), it reflects back in again as though the glass were really a mirror. This phenomenon is called total internal reflection. It's one of the things that keeps light inside the pipe.
- Optical fibers carry light signals down them in what are called modes.Light travels in different ways in single-mode and multi-mode fibers.
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