Final answer:
Tools commonly used for fault location, splice loss measurement, and length measurement in optical fibers.
Step-by-step explanation:
For fault location, a tool commonly used is an optical time domain reflectometer (OTDR). This tool sends pulses of light into an optical fiber and measures the reflections to pinpoint any faults or breaks in the fiber.
For splice loss measurement, a tool known as an optical power meter is used. This device measures the power loss that occurs at a splice point in an optical fiber.
For length measurement, a tool called an optical length tester is utilized. This tool sends a light signal through the fiber and measures the time it takes for the signal to travel to the end and back, allowing the length of the fiber to be determined.