相干噪声对OCDMA编解码器性能影响的分析

Analysis of the intermerometric noise at en/decoder in OCDMA system

给出了DS-OCDMA系统的各组成部分的数学模型,并对OCDMA系统中的相干噪声产生的基理进行了介绍,在充分考虑了光编解码器中光器件温度特性的基础上,分析了相干噪声的原因,并仿真了其对系统的影响。从对光、电编解码器的仿真结果可看出,当使用电编解码器实现OCDMA时,相干噪声的影响可大大降低,甚至完全避免。

The model of each part of DS-OCDMA system would be given, the origin of interferometric noise would be introduced. Based on the thermal characteristic of the optical devices used in optical en/decoders, the reason of the interferometric noise was analyzed. Then the affect of this noise would be simulated. From the results of the outputs at optical and electronic en/decoders, it can be obtained that the interferometric noise can be reduced or even avoided, when electronic encoder and decoder are used.