Which tester should be used for optical fiber identification?

The Visual Fault Locator (VFL) is the correct choice for optical fiber identification because it provides a straightforward and effective way to trace and identify optical fibers in a fiber optic network. The VFL emits a visible light, usually in the red spectrum, that can be injected into the fiber. If the fiber is intact, the light will travel through and can be seen at the far end or any break point in the fiber. This visual indication allows technicians to quickly verify and identify fibers, especially in complex networks.

In contrast, the other tools serve different purposes. An Optical Power Meter is primarily used to measure the power level in a fiber optic link, which is useful for testing performance rather than identification. A Fusion Splicer, while essential for joining fibers together, is not used for identification; its primary function is to permanently join two fiber ends. An Optical Time-Domain Reflectometer (OTDR) is a more advanced device that can assess the integrity of fiber links over longer distances and identify faults but is typically not used for simple identification tasks, making it less suitable for this specific requirement.