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Fiber Light Sources

LED Light Sources

Product description

Light-emitting Diodes

A light-emitting diode (LED) is an optoelectronic device which generates light via electroluminescence. It contains a p–n junction, through which an electric current is sent. In the heterojunction, the current generates electrons and holes, which release their energy portions as photons when they recombine. Although the fundamental process of light generation is the same as in laser diodes, light-emitting diodes do not exhibit laser action, i.e., they usually do not exploit stimulated emission. Their optical spectrum is substantially wider.

As LEDs can be quickly modulated, they are suitable for optical fiber communications over short distances. While the poor directionality of their emission requires the use of multimode fibers and thus restricts the transmission distances, the cost is significantly lower than for a system with single-mode fibers and laser diode transmitters. Moderately fast power modulation is also useful, e.g., for application in light barriers, as the modulated LED light is easily distinguished from the ambient light, and for remote controls.


Fiber Output LED Light Source