Optical code multiple access ( ocdma ) communication system is a spectral spreading system . all users in the system share all the bandwidth in the same time . because of the using of the almost infinitude bandwidth in the fiber , ocdma system will become more and more important in future ultra - high speed lan and online computer communication system 光码分多址( ocdma )通信系统,作为一种扩展频谱系统,用户同时共享所有带宽,因为可以充分利用光纤中的巨大带宽资源,因此在未来超高速局域网和实时计算机通信系统中将扮演重要角色。