针对二维光编解码接入网链路监测系统中多路距离相近用户信号叠加难以设置阈值的问题，提出了一种基于信号相关性的链路状态识别算法。该算法以正常信号为基准，对实时检测的信号进行信号相关性分析，根据带补偿自定义相关系数及系统的编码规则判断具体分支链路状态。搭建了32用户、3路等距实验系统,等距离链路断路个数为1时，相关系数为0.626 1；断路个数为2时，相关系数分别为0.342 1、0.386 5,均在阈值区间内。仿真结果表明，针对信号相关性而提出的自定义相关系数可以有效解决二维光编解码接入网链路监测系统中相近距离用户信号叠加问题。

To set threshold for multiuser signals overlapping with similar distance in twodimensional optical coding access network link monitoring system, a link state recognition algorithm based on signal correlation is proposed. By analyzing the correlation between the normal signal and the detected signal, the link state is determined according to the selfdefined correlation coefficient with compensation and the coding rules of the system. The simulation results show that the proposed algorithm can solve the problem of multilink reflected signals overlapping with equal distance or similar distance. A 32user experimental system with 3 equaldistance links is built. When one of the 3 equaldistance links is disconnected, the correlation coefficient is 0.626 1; when two of the 3 equaldistance links are disconnected, the correlation coefficients are 0.342 1 and 0.386 5, respectively, which are within the threshold interval. The selfdefined correlation coefficient can effectively solve the problem of multiuser signals overlapping in the twodimensional optical coding access network link monitoring system.