Optical Time Domain Reflectometer (OTDR)

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© Wikimedia Commons, Creative Commons Attribution-Share Alike 3.0. 25 September 2009.

This optical time domain reflectometer is being used to characterize an optical fiber by injecting a series of optical pulses and measuring backscattered light. These devices make use of the finite speed of light to measure the overall length of a fiber, as well as the distance to any breaks or imperfections. (Unit: 7)