What does "OTDR" stand for?

The term "OTDR" stands for Optical Time Domain Reflectometer. This is a crucial instrument used in the field of fiber optics to assess the integrity of optical fibers. An OTDR works by sending light pulses into the fiber and measuring the light that is reflected back. This reflection can provide valuable information about the fiber's characteristics, such as the location and extent of any faults, splices, or connectors along its length.

Understanding the capabilities of an OTDR is essential for technicians, as it helps them to troubleshoot and maintain fiber optic networks effectively. It allows for the identification of issues without needing physical access to the entire length of the fiber, making it a very efficient diagnostic tool.

In the context of the other options, while they include terminology relatable to fiber optics, they do not accurately describe the function or purpose of the device in question. The correct term reflects its specific functionality and widely accepted nomenclature in the telecommunications industry.