What is the function of an OTDR?

The primary function of an Optical Time-Domain Reflectometer (OTDR) is to detect faults and measure the length of fiber optic cables. An OTDR sends a series of pulses of light into a fiber optic cable and measures the light that is reflected back from points along the fiber. The data it collects allows technicians to see where in the cable transmission is inefficient or where faults might have occurred, such as breaks or bends. This capability to pinpoint issues is invaluable for maintaining the integrity of fiber optic networks, ensuring that they perform optimally by identifying exact locations of problems for repair.

In addition to fault detection, the OTDR also provides insights into the overall length of the fiber run, which helps in documentation and planning for future installations or upgrades. This functionality is critical for technicians working to ensure fiber networks are up and running smoothly, as they can quickly assess the health of the infrastructure.

The other options do not accurately describe the capabilities of an OTDR. Amplifying signals, converting electrical to optical signals, and providing lighting for installations are functions carried out by other types of devices and equipment used within the realm of fiber optics. Hence, the focus of an OTDR is specifically on fault detection and measurement within fiber optic systems.