5 LIGHT EMITTERS
Light emitters are a key element in any fiber optic system. These components convert the electrical signal into a corresponding light signal that can be injected into the fiber. The light emitter is important because it is often one of the most costly elements in the system, and its characteristics often strongly influence the final performance limits of a given fiber optic link.
There are two types of light emitters in widespread use in modern fiber optic systems: laser diodes (LD's) and light-emitting diodes (LED's). Laser diodes may be Fabry-Perot (the name refers to the mirrored surfaces on the ends), distributed feedback (DFB), or more recently vertical cavity surface-emitting laser (VCSEL) types while LED's are usually ...
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