基于混沌光注入互耦合VCSELs获取宽带宽、高复杂度混沌同步信号

发布时间：2018-06-27 04:10

本文选题：垂直腔面发射激光器(VCSELs) + 带宽　；参考：《西南大学》2017年硕士论文

【摘要】：混沌保密通信是近年来发展起来的一种新型保密通信技术,这种通信系统利用混沌信号作为载波,将传输信号隐藏在混沌载波中,在接收端利用混沌同步特性解调出所传输的信息,它可实现信息的物理层加密,因而在信息安全领域展现出了巨大的发展潜力。特别的,半导体激光器因在光反馈、光电反馈、光注入等外部扰动下易输出混沌信号而成为混沌同步通信系统理想的混沌光源。与普通的边发射半导体激光器(EELs)相比,垂直腔面发射激光器(VCSELs)具有体积小、阈值电流低、发散角小、可实现单纵模光输出、易与光纤耦合、易集成等优点,且在适当的条件可输出两个偏振分量,因而基于VCSELs的混沌保密通信为变成了近年来的研究热点之一。目前基于VCSEL混沌光源的研究主要集中在通过增加混沌载波的带宽以提高通信系统的传输容量或提高混沌信号的复杂度以增加通信的安全性等方面。然而,同时考虑VCSEL混沌同步通信系统中混沌光源的带宽和安全性的研究相对较少。因此,寻求一种能同时增加系统有效带宽和提高系统安全性的通信方案具有重要的实际价值。本文提出了一种带光反馈的垂直腔面发射激光器(I-VCSEL)单向注入到另一个VCSEL(D-VCSEL)获得了宽带混沌信号,然后用这个宽带混沌信号驱动两个互耦合垂直腔面发射激光器(MC-VCSELs)实现双通道、宽带宽、高复杂度的混沌同步方案。基于自旋反转模型(SFM),利用有效带宽计算方法、排列熵和互相关函数数值研究了DVCSEL注入MC-VCSELs的强度以及MC-VCSELs之间的互注入强度对系统输出混沌信号的带宽、复杂度及同步性能的影响。研究结果表明:通过合理选取D-VCSEL注入到MC-VCSELs的强度以及MC-VCSELs之间的互注入强度,MC-VCSELs每个偏振分量可输出带宽达30GHz、排列熵大于0.98的宽带宽、高复杂度的混沌信号。在考虑系统的同步性能后,我们确定了一个能同时实现宽带宽、高复杂度、高质量混沌同步的优化参数空间。激光器的内部参数失配对系统的同步性能有影响,与光场衰减率κ、线宽增强因子α和总的载流子衰减速率γ相比,混沌光注入互耦VCSELs的同步性能对自旋反转速率γs和有源介质双折射系数γ_p的失配有更好的容忍性。
[Abstract]:Chaotic secure communication is a new kind of secure communication technology developed in recent years. This communication system uses chaotic signal as carrier and hides the transmission signal in chaotic carrier. The information transmitted by the receiver is demodulated by chaotic synchronization. It can encrypt the information in the physical layer, so it shows great development potential in the field of information security. In particular, semiconductor lasers can easily output chaotic signals under external disturbances such as optical feedback, optoelectronic feedback, optical injection and so on, so they become the ideal chaotic light source for chaotic synchronous communication systems. Compared with the conventional side emitting semiconductor laser (EELs), Vertical cavity Surface emitting Laser (VCSELs) has the advantages of small volume, low threshold current, small divergence angle, easy coupling with optical fiber, easy integration and so on. And two polarization components can be output under appropriate conditions, so the chaotic secure communication based on VCSELs has become one of the research hotspots in recent years. At present, the research of chaotic light source based on VCSEL mainly focuses on increasing the transmission capacity of communication system or increasing the complexity of chaotic signal to increase the security of communication by increasing the bandwidth of chaotic carrier. However, the study of bandwidth and security of chaotic light source in VCSEL chaotic synchronous communication system is relatively rare. Therefore, it is of great practical value to seek a communication scheme that can increase both the effective bandwidth and the security of the system. In this paper, a vertical cavity surface emitting laser (I-VCSEL) with optical feedback is proposed to obtain wideband chaotic signals by unidirectional injection into another VCSEL (D-VCSEL). Then two mutually coupled vertical cavity surface-emitting lasers (MC-VCSELs) are driven by this wideband chaotic signal to realize two channels. Wide bandwidth, high complexity chaotic synchronization scheme. Based on the spin reversal model (SFM), the permutation entropy and cross-correlation function are used to calculate the effective bandwidth. The effects of the intensity of DVCSEL injection into MC-VCSELs and the mutual injection intensity between MC-VCSELs on the bandwidth, complexity and synchronization performance of the chaotic signal are studied. The results show that the intensity of D-VCSEL injection into MC-VCSELs and the mutual injection intensity between MC-VCSELs and MC-VCSELs can output a bandwidth of 30 GHz per polarization component, and a wide band of chaotic signals with a permutation entropy greater than 0.98 and a high complexity by selecting the D-VCSEL injection intensity into MC-VCSELs. After considering the synchronization performance of the system, we determine an optimal parameter space that can simultaneously achieve broadband wide, high complexity and high quality chaotic synchronization. The internal parameter mismatch of the laser has an effect on the synchronization performance of the system, compared with the optical field attenuation rate 魏, the linewidth enhancement factor 伪 and the total carrier attenuation rate 纬. The synchronization performance of chaotic optical injection mutual coupling VCSELs has better tolerance to the mismatch of spin inversion rate 纬 s and active medium birefringence coefficient 纬 s p.
【学位授予单位】：西南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O415.5;TN248

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