The beam splitter in the PON system is a passive device
For TDM-PON, a passive optical splitter is used in the optical distribution network. In the upstream direction, each ONU (optical network units) or ONT (optical network terminal) burst transmits for an assigned time-slot (multiplexed in the time domain). By connecting with OLT and ONU, the fiber splitter can achieve split ratios of 1:2, 1:4, 1:8, 1:16, 1:32, and more. It means that the only powered (active) equipment is at the service provider's central unit and on the user's side.
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