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基于光码分多址技术应用于接入网具有异步接入、用户分配的灵活性、支持不同业务、系统的安全性等优点成为下一代接入网的最佳候选方案之一。首先介绍了OCDMA应用于接入网的相干和非相干两种系统结构、接着介绍了基于光素数码和光正交码两种编码方式的地址码的选择和构造、最后分析了在用户数较多和较少时两种情况下的系统误码率,得出了影响系统性能的3个参数:用户数、码长和码重。
Optical code division multiple access technology based on access network with asynchronous access, user allocation flexibility to support different services, system security and other advantages of the next generation access network, one of the best candidates. Firstly, we introduce the coherent and non-coherent system architecture of OCDMA for access network. Then we introduce the selection and construction of address codes based on two encoding methods: light digital and optical orthogonal code. Finally, And less when the two cases of system error rate, the system has come in three parameters: user number, code length and code weight.