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EPON通信系统由光纤线路终端(OLT)、光分配网络(ODN)和光网络单元(ONU)组成。EPON组网采用树形拓扑结构,光信号通过分光器把OLT一根光纤下行的信号分成多路给每一个ONU,每个ONU上行的信号通过分光器合成在一根光纤里给OLT。
EPON communication system by the optical line terminal (OLT), optical distribution network (ODN) and optical network unit (ONU) composition. The EPON network adopts a tree topology. The optical signal is split into a plurality of signals for each ONU through a fiber splitter. An uplink signal of each ONU is combined into an optical fiber and sent to an OLT through an optical splitter.