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提出了一种基于时隙分组光码分多址(OCDMA)技术的无源光接入网模型,给出了一种时隙分组OCDMA的随机接入协议,系统采用比特填充单极性m序列为地址码。推导了此种随机接入协议下的无源光网络的网络吞吐量数学模型,并对网络的吞吐量性能进行了分析研究。理论分析和仿真结果表明,分组时隙OCDMA网络具有较高的网络吞吐量,单个用户接收功率的降低或多用户干扰的增加,会降低系统网络的吞吐量。随着负载的增大,单个用户接收功率越小网络的吞吐量越低。通过减小分组长度可以提高网络的吞吐能力。
A passive optical access network model based on OCDMA is proposed. A random access protocol for slotted packet OCDMA is given. The system uses bit-packed unipolar m-sequence For the address code. The mathematical model of network throughput of passive optical network under such random access protocol is deduced, and the throughput performance of the network is analyzed. The theoretical analysis and simulation results show that the OCDMA network with packet timeslots has high network throughput, the reduction of single user reception power or the increase of multi-user interference will reduce the throughput of the system network. As load increases, the smaller a single user receives power, the lower the throughput of the network. By reducing the packet length can increase the throughput of the network.