What does the term "optical time-domain reflectometer" (OTDR) refer to?

The term "optical time-domain reflectometer" (OTDR) refers to a device that tests fiber optic cables by sending pulses of light into the fiber and measuring the reflected signals that return to the device. The OTDR operates by analyzing the light that is reflected back due to various factors, such as imperfections in the fiber, connections, and splices. By interpreting the time it takes for the light pulses to return, the OTDR provides valuable information about the overall quality and integrity of the fiber optic link, allowing technicians to locate faults, assess splice loss, and ensure that the installation meets required performance standards. This functionality is essential for maintaining and troubleshooting fiber optic networks effectively.

In contrast, other devices listed have different specific functions; for example, equipment used for splicing fibers is designed to physically join two fiber ends rather than test their integrity. Similarly, devices that connect multiple cables focus on establishing connections rather than evaluating performance. Lastly, while measuring signal strength is important in fiber optic systems, the direct measurement of reflected light and the analysis of fiber performance is the unique capability of an OTDR.