提出了一种在PON(无源光网络)中实现长发光检测的方法, 通过对上行光信号进行SD(信号检测)采样, 再基于SD信号是否有效来判定是否存在长发光现象。OLT(光线路终端)首先构造一个短时隙通过光模块下发给ONU(光网络单元), 并控制光模块根据该短时隙对上行光信号进行SD采样, 得到第一检测结果; OLT根据第一检测结果判断上行光信号是否有效, 在判断结果为是的情况下, OLT再次构造一个长时隙下发, 并基于该长时隙对上行光信号进行SD采样, 得到第二检测结果; OLT根据第二检测结果确定当前PON口是否存在长发光现象。相比常用的光功率检测方式, 文章所提方法具有更高的可靠性和准确性, 且不会占用固定带宽, 最大限度地保证了上行带宽的利用率。

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.