Optical Time-Domain Reflectometers (OTDRs) analyze fiber by sending optical pulses into the link and measuring returned reflections and backscatter over distance. This enables technicians to locate events such as splices, connectors, bends, breaks, and other loss points while documenting the overall fiber path. Engineers should consider dynamic range, wavelength support, event resolution, dead zones, launch and receive requirements, and the fiber type being tested. WAV provides OTDR equipment for commissioning, acceptance testing, troubleshooting, and preventive maintenance.