The core of the fiber is made of a highly transparent material, which allows the light to travel through it with minimal attenuation or loss of signal. It is a cylinder of glass or plastic that runs along the fiber's length. This section will outline the fundamental concepts that underlie fiber optics, beginning with its definition and overview, and examining its rich historical context. ” However, when light enters the core it needs to remain within it, and one layer that ensures that is called. These strands, known as fibre optic cables, have revolutionised telecommunications because they transmit information using pulses of light. Optical fibers are also resistant to.