Certified Fiber Optics Practice Exam

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Which device is used to identify a break in an optical fiber?

Power Meter
Fault Isolator
Optical Time Domain Reflectometer
Connector Tester

The correct answer is: Fault Isolator

The correct device used to identify a break in an optical fiber is the Optical Time Domain Reflectometer (OTDR). An OTDR works by sending a series of light pulses into the fiber and measuring the light that is reflected back. When there is a break or fault in the fiber, the OTDR detects a significant drop in the reflected light and can provide information about the location and nature of the break based on the time it takes for the reflections to return. This capability allows technicians to precisely locate issues within the fiber, making the OTDR an essential tool for fiber optic testing and maintenance. While other devices mentioned have their specific functions, such as measuring signal strength or assessing connectors, they do not have the specialized functionality to identify and locate breaks within the optical fiber itself.