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The term OTDR stands for Optical Time Domain Reflectometer. This device is critical in the field of fiber optics testing. It operates by sending a pulse of light into a fiber optic cable and measuring the light that is reflected back. This allows technicians to assess the integrity of the fiber, identify any breaks, splices, or connectors that may affect performance, and determine the overall quality of the cable installation.

An OTDR's ability to provide detailed information about the length and characteristics of the fiber optic link makes it an essential tool for both installation and maintenance. It generates a trace that technicians can analyze to diagnose issues, making it invaluable for ensuring that optical networks operate efficiently.

While the other options incorporate some relevant terminology, they do not accurately describe the device used in fiber optic testing. Understanding that OTDR specifically refers to a reflectometer clarifies its function and importance in the testing and maintenance of fiber optic systems.