ONU refers to the equipment integrating traditional ONU and power consumption data collector, which is called optical fiber collector. Through single-mode bi- directonal optical fiber, the upstream and downstream data of EPON has realized full-duplex communication by WDM (Wavelength Division Multiplexing) with a data rate of 1.25 G b/s. The downstream communication (from OLT to ONU) adopts TDM (Time Division Multiplex) broadcasting mode. The data is broadcasted from OLT down to all ONU by variable length information packet, and the maximum length of information packet can be 1518 bytes. Based on LLID (Logical Link Identifier), ONU receives packets that belongs to it and abandons other packets (e.g. [3]). The wave length of downstream communication is 1490 nm. The upstream communication shares the system by TDMA (Time DivisionMultiple Access). For each ONU upstream data, a private timeslot is allocated to ensure that only one ONU is sending upstream data at a time. The procedure is as follows: all data is marked with a unique LLID tag at ONU, then the OLT will allocate each registered ONU with a LLID tag, and finally the data is sent to OLT according to its timeslot. More details about the registration phase can be found in the current version of the IEEE 802.3ah standard as well as in [4]. The wave length of upstream communication is 1310nm. As the branch-side equipment of EPON network, OLT aggregates data from ONU, which provides internet ports and other interfaces on consumer side. ODN is a 100% optical network of different topologies enabled by splitters of various split number and split ratio. It connects OLT and ONU, as illustrated in Figure 1 (e.g. [5]).