LEDs, or light emitting diodes, play a crucial role in fiber optic communications, and this technology would not be possible without it. An LED is a semi-conductor device that converts electrical currents into light in a process referred to as electroluminescence. Using light as a medium to transmit signals and data is at the core of fiber optic technology. LEDs possess many characteristics which make them an ideal light source for fiber optic communication systems. LED has very high light conversion efficiency and generates little heat, while being small enough to use with fiber optic technology.