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There are currently 4 terms in this directory beginning with the letter A.
Access Network
The section of a telecom network that connects subscribers to the plant of their immediate service provider.

Active Component
A part of a photonic circuit that requires external electric power to control or modify optical signals. Examples: lasers, modulators, photodetectors

Analog Signal
A continuous signal that represents (i.e. another physical quantity (i.e. that is "analogous" to the other quantity).

The degradation of an optical signal over distance. Depending on the medium (air, optical fiber) this degradation will vary.