Multimode fiber optic transmitters typically use low-cost _____ _____ light sources.

Multimode fiber optic transmitters are designed to operate efficiently over short distances and generally utilize light sources that are cost-effective. The correct choice identifies LED (Light Emitting Diode) or VCSEL (Vertical Cavity Surface Emitting Laser) as the typical light sources for these transmitters.

LEDs are widely used in multimode applications due to their low cost and capability to emit light over a broad wavelength range. This attribute allows them to couple well into the larger core diameters of multimode fibers, making them suitable for such applications. VCSELs, while slightly more complex, still offer an affordable option with higher efficiency and better performance in terms of modulation and bandwidth compared to traditional LEDs.

Using these types of light sources aligns with the need for economical solutions in multimode fiber systems, where high data rates and extended operational distances are not as critical as in single-mode systems. Thus, LED and VCSEL technologies make them ideal choices for multimode fiber optic installations, balancing cost with performance for the intended application.

The other options, while they may refer to light sources that could be used in optical transmission, do not specifically capture the characteristics and benefits of the cost-effective solutions typically employed in multimode systems.