Insertion loss
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In telecommunications, insertion loss is the decrease in transmitted signal power resulting from the insertion of a device in a transmission line or optical fiber. It is usually expressed relative to the signal power delivered to that same part before insertion. Insertion loss is usually expressed in dB.
The insertion loss of a device (which may be a whole line) may also be referred to as attenuation.
In an optical fiber system, insertion loss is introduced by things such as connectors, splices, and couplers.
References
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