Which of the following are two primary types of light sources in fiber optic cables?

When discussing the primary types of light sources used in fiber optic cables, the focus is on the characteristics and functionality of the light sources themselves. Laser diodes and LEDs (Light Emitting Diodes) are the two primary types used in this context.

Laser diodes are known for their ability to emit coherent light, which allows the light to travel longer distances with minimal signal loss. They are typically used in applications that require high-speed data transmission over long distances. The precision and focused nature of the light emitted by laser diodes make them highly effective for use in fiber optics.

LEDs, on the other hand, are used for shorter-range applications. They produce light that is less coherent than that of laser diodes, but they are generally more affordable and have a longer lifespan. LEDs are suitable for shorter segments of fiber optics, where high speed is not as crucial and cost-effectiveness is a priority.

The combination of these two types of light sources provides different options for various applications in fiber optic communication, making them the correct choices in this context.