What does performing a light check ensure in a fiber optic system?

Performing a light check in a fiber optic system primarily ensures that the fiber path is continuous. This procedure involves sending a light signal through the fiber and checking for continuity at the other end. If light is detected, it indicates that the fiber is intact and that there are no breaks or significant bends that could impair signal transmission.

Establishing continuity is crucial for the overall performance and reliability of a fiber optic network. A break or damage in the fiber can lead to signal loss or degradation, making it essential to confirm that the light travels freely from one end of the fiber to the other.

In this context, while other options touch upon important aspects of fiber optics—like loss measurements, power distribution, and terminations—they do not specifically address the fundamental purpose of a light check, which is to verify that the pathway for light is uninterrupted. Thus, the focus on confirming the integrity of the fiber path stands out as the primary reason for conducting a light check.