Which types of light sources are most commonly used in fiber optics?

The most commonly used light sources in fiber optics are LEDs and laser diodes. LEDs, or light-emitting diodes, are popular due to their efficiency, reliability, and ability to emit light over a wide range of wavelengths. They are particularly useful in short-distance communication applications, like in local area networks. On the other hand, laser diodes are favored for their capability to produce highly coherent light, which allows for longer transmission distances and higher bandwidths. This makes them suitable for applications in telecommunications and data centers.

In contrast, incandescent bulbs and laser sources do not offer the same efficiency or coherence needed for fiber optic applications. Plasma sources, while they can produce intense light, are rarely used in fiber optics due to their size and complexity. Additionally, while CFLs and halogen lamps are common in general lighting, they are not applicable for fiber optics where specific light wavelength and coherence properties are critical for effective transmission of signals. Therefore, the combination of LEDs and laser diodes is the optimal choice for fiber optic systems, providing both versatility and performance.