一种光码分多址无源接入网及其性能研究  

A New OCDMA Passive Access Network and Its Performance Analysis

作　　者：李传起[1] 周谞[2] 宋标[2] 孙婷婷[2] 赵立龙[2] 朱迎春[2] 

机构地区：[1]广西师范大学电子工程学院,广西桂林541004 [2]南京信息工程大学电子与信息工程学院,江苏南京210044

出　　处：《光学学报》2010年第3期660-664,共5页Acta Optica Sinica

基　　金：江苏省自然科学基金(BK2008437);江苏省高校自然科学基金(07KJB510066)资助课题

摘　　要：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 new architecture of access network based on slotted optical code division multiple access（OCDMA） packet passive optical network（PON） is proposed.The random access protocol based on this network is presented, and the bit-stuffed unipolar m-sequence is used as the address code.Next,mathematic model of the network throughput of the passive optical network under the given protocol is derived.The throughput performance is numerically investigated.Theoretical analysis and simulation results show that the proposed slotted OCDMA packet network obtains a better network performance.The network throughput will be deteriorated by reducing the received optical power or increasing the multiple access interference.But the throughput decreases as the received power decreases when the offered traffic becomes larger.By reducing the packet length,the network throughput will be improved.

关 键 词：光纤通信 光码分多址 网络吞吐量 随机接入协议 

分 类 号：TN929.11[电子电信—通信与信息系统]