What tool is commonly used to measure signal loss in a fiber optic cable?

An Optical Power Meter is the correct tool for measuring signal loss in a fiber optic cable. This device specifically measures the amount of optical power transmitted through the fiber, allowing technicians to determine the loss of signal as it travels along the cable. By comparing the power output from the source and the power received at the end of the fiber, professionals can effectively assess the performance of the installation and identify any problematic segments that may have excessive loss.

While a multimeter is useful for various electrical measurements, it is not designed for optical signals and therefore cannot accurately assess light levels in fiber optics. A wire stripper is used for preparing and stripping the insulation off electrical wires, which is not related to fiber optic cable measurements. A cable tester can check connectivity and faults in electrical cables but typically does not measure optical power or signal loss in fiber optic systems, making it unsuitable for this specific application.