摘要
为了研究多信道全光混沌通信系统中信道串扰对系统同步及解码性能的影响,构建了基于垂直腔面发射激光器的多信道混沌通信系统模型。通过利用描述其特性的速率方程模型,采用相似指数作为参考标准来评价同步性能,并进行了2.5Gb it/s混沌掩藏方式的编解码数值模拟。结果表明,相对注入强度越小,信道间隔越大,系统同步的性能越好;双信道系统的同步质量相比主从式单信道系统会有明显下降,而进一步增加信道数量,同步品质并不发生显著改变。在同步质量足够高时,信号可以得到较好的恢复。
In order to study the effect of the cross talk on synchronization and decoding, a multichannel chaotic optical communication system was established based on vertical-cavity surface-emitting lasers（VCSELs）. Based on the corresponding rate equations,similarity index was used to evaluate the synchronization performance, and 2.5Gbit/s message coding/decoding of chaotic masking method was numerically analyzed. The results show that the system can get better synchronization quality with less relative injection strength and more channel interval. The synchronization performance of dual-channel system decreases obviously compared with master-slave single channel system, and changes little when the channel number increases. The signals can be correctly recovered when the synchronization is good enough.
出处
《激光技术》
CAS
CSCD
北大核心
2008年第4期445-448,共4页
Laser Technology
基金
国家自然科学基金资助项目(10174057)
教育部科学技术研究重点项目资助项目(105148)
关键词
激光技术
保密通信
速率方程
多信道
信道串扰
laser technique
secure communication
rate equations
multichannel
cross talk
