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Study for Broad-Band Chaotic Generator Using Semiconductor Lasers in Secure Optical Communications

安全光通信中使用半导体激光器的宽带混沌发生器研究

基本信息

批准号：
15360029
负责人：
OHSTUBO Junji
金额：
$ 8.06万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Recently, it has been discovered that the modulation bandwidth of semiconductor laser is greatly enhanced by a strong optical injection from a different laser. In chaotic secure communication systems using semiconductor lasers, the maximum chaotic carrier frequency plays an important role for data transmission rate. The chaotic carrier frequency is closely related to the modulation bandwidth of semiconductor lasers. Therefore the usage of semiconductor lasers with high modulation bandwidth is essential in chaotic secure optical communications. However, little study has been performed for the mechanism of the enhancement of the modulation bandwidth. In this study, we performed an extensive research for the mechanism for the modulation bandwidth in semiconductor lasers with strong optical injection. Also, we developed a broad-band chaotic generators using chaotic semiconductor lasers with strong optical injection for the purpose of hardware-dependent secure optical secure communications … More with high data-transmission rate.We have proposed the model for the chaotic generator of semiconductor lasers with optical feedback and formulated the systems by the rate equations. By the numerical simulations, the cut-off chaotic carrier frequency of 2.7 GHz without strong optical injection to a semiconductor laser is expanded to 7.0 GHz by the introduction of strong optical injection to the laser. Based on the theoretical investigation, we have developed a chaotic generator consisting of a MQW semiconductor laser with strong optical injection. The injection ratio was over 30 % of the solitary laser output power. In this system, we could obtain 9 GHz bandwidth for the solitary chaotic carrier frequency of 3 GHz. For the case of a DFB semiconductor laser, the chaotic generator frequency of 3 GHz without optical injection is expanded up to 14 GHz. Based on this research, we have done numerical study for chaos synchronization in the broadband chaotic generators. According to this numerical study, we have successfully performed chaos synchronization between the broadband chaotic generators. Also we have numerically succeeded a message transmission over the solitary chaotic carrier frequency. Less

最近，人们发现，半导体激光器的调制带宽大大提高了从不同的激光器的强光注入。在半导体激光器混沌保密通信系统中，最大混沌载波频率对数据传输速率起着重要的作用。混沌载波频率与半导体激光器的调制带宽密切相关。因此，使用高调制带宽的半导体激光器在混沌保密光通信中是必不可少的。然而，很少有研究已经进行了调制带宽的增强的机制。本文对强光注入半导体激光器调制带宽的机理进行了深入的研究。此外，我们还研制了一种宽带混沌发生器，该发生器采用具有强光注入的混沌半导体激光器，用于依赖于硬件的保密光通信 ...更多信息提出了光反馈半导体激光器混沌发生器的模型，并由速率方程建立了系统的数学模型。通过数值模拟，在没有强光注入的情况下，半导体激光器的截止混沌载波频率从2.7GHz扩展到7.0GHz。在理论研究的基础上，我们研制了一台由强光注入多量子阱半导体激光器构成的混沌发生器。注入比大于单脉冲激光输出功率的30%.在该系统中，当孤立子混沌载波频率为3GHz时，可以获得9 GHz的带宽。对于DFB半导体激光器，混沌发生器的频率为3 GHz，没有光注入扩展到14 GHz。在此基础上，对宽带混沌发生器中的混沌同步进行了数值研究。根据数值研究，我们成功地实现了宽带混沌发生器之间的混沌同步。并在数值上成功地实现了孤立混沌载波频率上的信息传输。少