What does a power meter do in a fiber optics system?

A power meter in a fiber optics system is designed to measure the optical power that is transmitted through the fiber. By providing numerical readings, the power meter helps technicians assess the strength of the light signal in terms of power levels, typically measured in dBm (decibels relative to 1 milliwatt). This is crucial for ensuring that the fiber optic system is functioning correctly, as it allows for the verification that the transmitted signal is within acceptable parameters for the system’s performance. The numerical data obtained can help in troubleshooting and confirming whether the system meets the required specifications for signal loss and strength.

The other options refer to different functionalities. Connecting two fibers typically involves the use of splices or connectors, while sending light through the fiber pertains to the functionality of a light source or transmitter, rather than the power meter. Identifying faults in the cable is generally performed using tools like optical time domain reflectometers (OTDRs), which analyze the reflections of light in the fiber to pinpoint issues. The power meter specifically measures light power levels, which is essential for the performance evaluation of the fiber optic network.