光码分多址(OCDMA)应用于接入网的研究

Study of OCDMA Technology in Access Network

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（OCDMA） has become one of the best choices for the next-generation technology in access network for its features including asynchronous access,flexible users allocation,and ability to support different services.This paper first gives the structures of coherent systems and non-coherent systems for OCDMA in access network,then describes the selection and construction of address code based on optical prime code and optical orthogonal code,and finally analyzes of the system BER with large number and small number of users.The experiment results show that the three parameters affecting system performance include the number of the users,the length of code and the weight of code.