Introduction to Fiber Optics, 3rd Edition

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Does it work? This is the first question that occurs to us once we have carried out

any work on an optic fiber system. There are several different tests we can con-

duct. We will start with the simplest.

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Testing a system

Remember to take precautions to avoid accidental viewing of ‘live’ fibers

Visible light continuity test

For short lengths of multimode cable up to about 100 meters any source of white

light can be used. The end of the fiber can be held against a flashlight or an electric

light bulb or even sunlight if it is available. The range obviously depends on the

brightness of the light source and the losses on the fiber, so an absolute limit ...