How to measure fiber optic channel attenuation

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Why is low attenuation important for optical communication systems? Low attenuation keeps your signal. Attenuation -- the dB-per-kilometer loss of light traveling through the glass -- is the fundamental property of fiber. Three methods exist for measuring it: cutback (the reference standard), insertion loss (the field standard), and OTDR (the diagnostic tool). The most fundamental parameter for optical fiber is geometry, since the dimensions of the fiber determine its ability to be spliced and terminated to other fibers.

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