Final answer:
Lasers are the preferred light sources for testing multimode Local Area Networks (LANS) in optical fiber communication systems. They offer high bandwidth, low loss, and reduced crosstalk between fibers, making them the optimal choice for long-distance transmission in LANS.
Step-by-step explanation:
Light sources used to test multimode Local Area Networks (LANS) typically use lasers as the electro-optical component. Lasers emit light with characteristics that make them ideal for optical fiber communication systems. They offer high bandwidth and low loss, allowing for long-distance transmission of light through the fibers. Lasers also minimize crosstalk between adjacent fibers, ensuring clear and reliable communication in LANS.