1x2 odn (optical distribution network)
splitter is a passive device used to connect olt and onu, distributing down link data and integrating
uplink data. the splitter includes an uplink fiber port and several downlink fiber ports. optical signal from
uplink fiber port is distributed to all the downlink fiber ports, and optical signal from downlink ports is
assigned to the only one-uplink fiber port. there is fiber loss existed during this process.
splitter is installed in the fiber distribution box (indoor type or outdoor type); if mdu （multi dwelling unit）
is distracted from each other and there is not enough fiber resource, second level and multilevel splitter is
supported.
to choose the splitter ratio, there is several conditions need to consider: epon system transmission
distance, amount of mdu users, and bandwidth in the system. usually, 1:32 splitter is better for
ftth/fttb solution. total amount is less than 512.
