Optical attenuation at the port of the optical splitter in the corridor

Measure the optical power at both the input and output ports of the splitter. Actual optical attenuation = Upstream optical power on one side of the test point - Upstream optical power on the other side of the test point. In fiber optic networks, particularly in FTTx (Fiber to the x) and PON (Passive Optical Networks) deployments, splitters play a central role in distributing the optical signal from a single source to multiple destinations. [pdf]