What type of light source is commonly used for multi-mode fiber optics?

The commonly used light source for multi-mode fiber optics is LEDs (Light Emitting Diodes). LEDs are preferred for multi-mode applications because they emit light over a broad wavelength range and produce a larger light output that can efficiently couple into the core of multi-mode fiber. This is essential for ensuring the effective transmission of signals over the shorter distances typically associated with multi-mode systems.

Moreover, LEDs have a relatively low cost and are robust, making them suitable for various applications in local area networks and data centers that employ multi-mode fibers. They support multiple light paths in the fiber, which enhances the capacity for transmitting data over shorter distances with lower losses.

In contrast, fiber lasers, high-pressure sodium lamps, and arc lamps are not commonly used in this context. Fiber lasers are more commonly used for single-mode fibers due to their capability of producing coherent light. High-pressure sodium lamps and arc lamps are typically used in lighting and arc welding applications rather than in fiber optic communications. This contextual understanding of how and why LEDs are utilized enhances comprehension of the fundamental operations in fiber optic technologies, especially within multi-mode systems.