基于二维编/解码器的非相干OCDMA系统研究
The Study of Incoherent OCDMA System based on Two-Dimensional Encoder/Decoder
光编/解码器 二维非相干光码分多址系统 多址干扰 系统性能 optical encoder/decoder two-dimensional incoherent OCDMA system MAI system performance
摘要
为提高非相干光码分多址(OCDMA)系统的安全性和光纤带宽利用率,采用p=5的素数码/素数码作为二维地址码设计了二维光编/解码器,并在OptiSystem软件中搭建了二维非相干OCDMA系统。仿真结果表明,二维非相干OCDMA系统能够实现信号传输。当存在多用户时,系统产生多址干扰(MAI),会恶化系统性能。仿真分析表明,在二维非相干OCDMA系统接收端引入光硬限幅器,可以有效抑制MAI,提高系统性能。
Abstract
To improve the security and optical fiber bandwidth utilization of incoherent Optical Code Division Multiple Access (OCDMA) system,the two-dimensional optical encoder/decoder based on prime code/prime code in p=5 as two-dimensional address code is proposed.Two-dimensional incoherent OCDMA system is analyzed based on OptiSystem platform.The simulation indicates that the two-dimensional incoherent OCDMA system is able to transmit signal successfully.The performance of OCDMA system is deteriorated due to the Multiple Access Interference (MAI) when multiple users exist.Then the method to suppress the MAI is proposed.The simulation results show that MAI can be effectively avoided when optical hard limiters exist.
洪媛, 徐宁. 基于二维编/解码器的非相干OCDMA系统研究[J]. 光通信研究, 2018, 44(4): 1. HONG Yuan, XU Ning. The Study of Incoherent OCDMA System based on Two-Dimensional Encoder/Decoder[J]. Study On Optical Communications, 2018, 44(4): 1.