A novel rogue detection method is proposed to determine the ultimate result based on the validity of SD sampling over upstream optical signal.The OLT constructs a short timeslot and transmits it via an optical transceiver.Then

the OLT controls the optical transceiver to conduct a first SD sampling detection to the upstream optical signal according to the short timeslot to obtain a first detection result.Next

the OLT judges whether the upstream optical signal is valid according to the first detection result.If it is valid

the OLT constructs a long timeslot and transmits it via the optical transceiver

and controls the optical transceiver to conduct a second SD sampling detection to the upstream optical signal according to the long timeslot to obtain a second detection result.The OLT determines whether the current PON port is experiencing rogue behavior according to the second detection result.Compared to the common RSSI detection method

the proposed method has higher reliability and accuracy with the fact that no more fixed bandwidth will be occupied so as to assure the upstream bandwidth utilization as much as possible.