An Optical Time Domain Reflectometer is an optoelectronic instrument that characterizes an optical fiber by injecting a repetitive series of narrow laser pulses and measuring, as a function of time, the intensity of the light that is backscattered and reflected back to the. An Optical Time Domain Reflectometer is an optoelectronic instrument that characterizes an optical fiber by injecting a repetitive series of narrow laser pulses and measuring, as a function of time, the intensity of the light that is backscattered and reflected back to the. Optical time domain reflectometers are instruments which measure the spatially resolved reflectivities and losses in optical fibers. They are mostly used in the technology of optical fiber communications for testing fiber-optic links (e. in cable TV, LAN, metropolitan networks or long-haul. metry (OTDR), covering its principle, impl e an essential tool for: characterisation, certification, maintenance and monitoring optical networks. They characterise the len th, attenuation and return loss (ov se individual events along ink: connection points (splices, connectors), te ng by. The Optical Time Domain Reflectometer (OTDR) was developed precisely for this environment. An OTDR works on a principle analogous to radar: it fires a carefully controlled pulse of laser light into one end of the fiber, then listens for the faint echoes that return. OTDR testing analyzes fiber optic cable performance from end to end by testing components along the cable, including connection points, bends, and splices. What Is an OTDR? What Is an OTDR? An OTDR is. Please Login/register to save starred items to Your Library.