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在光纤接入网中，为了提高传输容量、降低成本，充分实现光纤传输媒质和传输设备资源共享，在下行方向，采用多路信号可同时传输的复用技术；而上行方向，由于ＯＬＴ（光纤线路终端）需与多个位置不同的ＯＮＵ（光网络单元）相连，故采用可区分不同用户的多址技术。目前存在着
In the optical access network, in order to increase the transmission capacity, reduce the cost, fully realize the resource sharing of the optical transmission media and the transmission equipment, and use the multiplex technology of multiple signals to be simultaneously transmitted in the downlink direction; and in the uplink direction, Line terminal) needs to be connected with a plurality of ONUs (optical network units) with different locations, so a multiple access technology that can distinguish different users is adopted. There is now