What does an Optical Time Domain Reflectometer (OTDR) measure?

An Optical Time Domain Reflectometer (OTDR) measures loss and discontinuity in optical fibers by utilizing wave propagation principles. It sends a series of light pulses down an optical fiber and analyzes the reflected light that comes back. By assessing the time it takes for light to bounce back and the intensity of the reflected signals, the OTDR can detect and locate faults, splices, and loss points along the fiber.

This capability makes the OTDR an essential tool for fiber optic technicians as it helps in troubleshooting and validating the integrity of fiber optic installations. The detailed measurements and analysis provided by an OTDR are invaluable for maintaining and ensuring the quality of optical networks, which rely on the efficient transmission of light signals over fiber cables.

While other options touch on aspects related to optical fibers, they either narrow the scope incorrectly or focus on components of measurement that do not encompass the full functionality of an OTDR.