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Since fiber infrastructure of the PON is based on passive point-to-multipoint architecture, the feeder subchapter which is from the OLT to the remote node is shared by all ONUs and hence the cost on a per-user basis can be kept low.
An OLT is connected with many ONUs via a remote node, which usually contains one or several optical power splitters.
multiplexed by the remote node in the time domain and sent to the OLT.
, arrayed waveguide grating (AWG) (see Fig. 1.3), in the remote node.
Another type of WDM-PON which is referred to as power-splitting approach still uses optical splitter at the remote node, where the data signals with different wavelengths are broadcasted to each ONU.
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