What does a fiber optic power meter measure?

A fiber optic power meter is specifically designed to measure optical power in fiber optic systems. The measurement is typically expressed in decibels relative to one milliwatt (dBm), which provides a standardized way to quantify the light power being transmitted through the fiber. This measurement is crucial for assessing the performance of fiber optic links, as it helps technicians determine whether signal levels are adequate for proper operation or if adjustments are necessary.

Understanding the optical power in dBm allows technicians to troubleshoot and ensure the reliability of the fiber optic communication system. It can indicate whether there is excessive loss in the system due to factors such as splices or connectors, allowing for the optimization of the network.

In contrast, the other options do not align with the function of a fiber optic power meter. Voltage measurements are not relevant since fiber optic systems utilize light rather than electrical signals, and measuring time delay pertains more to the timing analysis in signal processing, not power measurement. Temperature readings, while important in some contexts, are not a direct measurement provided by a fiber optic power meter. Thus, measuring absolute power in dBm is the primary and correct function of this tool.