基于偏振旋转耦合1550nm-VCSELs环形系统产生多路高质量混沌信号的研究
发布时间：2018-11-15 10:56
【摘要】：近年来,随着信息技术的快速发展,利用半导体激光器产生的混沌激光信号因其在高速保密通信、混沌雷达以及高速随机数产生等方面的巨大应用前景而成为人们关注的焦点。通常,半导体激光器在光反馈、光注入及光电反馈等外部扰动作用下可产生混沌信号。其中,通过引入光反馈产生的混沌信号会不可避免的保留一定的时间延迟特征(TDS),这不利于混沌激光信号在混沌保密通信及随机数产生等领域的应用。因此,有必要采用适当方法对混沌信号的TDS进行有效抑制。特别地,垂直腔面发射激光器(VCSELs)在适当条件下可能同时存在两个相互正交的偏振分量(X-PC,Y-PC),将三个及以上VCSELs构成环形系统,理论上可同时产生多路混沌激光信号。若将此系统作为混沌熵源,则具有同时产生多路随机比特序列的可能性。本文提出了一种基于三个单向偏振旋转耦合1550 nm-VCSELs构成的环形系统获取多路高质量混沌信号的方案。利用自旋反转模型,理论研究了该系统中三个激光器各偏振分量输出信号的非线性动力学特性;采用自相关和互信息方法分析了各偏振分量输出时间序列的TDS,并利用互相关函数讨论了各偏振分量之间的相关特性。研究结果表明:采用偏振旋转耦合的方式,通过合理调节各激光器之间的注入强度和频率失谐,三个1550 nm-VCSELs的六个偏振分量能同时存在,且各偏振分量的输出功率相当;系统中单向偏振旋转耦合的注入强度和频率失谐对该系统输出的六路信号的TDS均有显著影响;对于分别固定注入强度或频率失谐的情况,通过调节其他系统参量可使各偏振分量输出信号的TDS峰值均被抑制到0.2以下;通过综合分析注入强度和频率失谐联合作用对系统输出信号TDS的影响,确定了能有效抑制各路混沌信号TDS的耦合参数取值的精确范围;通过进一步优化系统参数范围,可保证六路输出信号中仅同一个VCSEL输出的两偏振分量之间存在较强的相关性,而不同VCSELs偏振分量输出信号之间的相关性均较弱。因此,该系统能同时输出六路TDS被有效抑制的混沌信号,且其中三路混沌信号的相关性较弱。
[Abstract]:In recent years, with the rapid development of information technology, chaotic laser signals generated by semiconductor lasers have become the focus of attention due to their great application prospects in high speed secure communication, chaotic radar and high speed random number generation. Generally, semiconductor lasers can produce chaotic signals under external disturbances such as optical feedback, optical injection and optoelectronic feedback. Among them, the chaotic signal generated by optical feedback will inevitably retain a certain time delay characteristic (TDS), which is not conducive to the application of chaotic laser signal in the field of chaotic secure communication and random number generation. Therefore, it is necessary to effectively suppress the TDS of chaotic signals by appropriate methods. In particular, the vertical cavity surface emitting laser (VCSELs) may have two orthogonal polarization components (X-PC-Y-PC) at the same time under appropriate conditions. Three or more VCSELs are used to form a ring system. In theory, multiple chaotic laser signals can be generated at the same time. If the system is used as a chaotic entropy source, it is possible to produce multiple random bit sequences at the same time. In this paper, a scheme for obtaining high quality chaotic signals from a ring system based on three unidirectional polarization rotation coupling 1550 nm-VCSELs is proposed. Based on the spin inversion model, the nonlinear dynamic characteristics of the output signals of three laser polarization components in the system are studied theoretically. The autocorrelation and mutual information methods are used to analyze the TDS, of each polarization component output time series and the correlation characteristics between the polarization components are discussed by using the cross-correlation function. The results show that the six polarization components of three 1550 nm-VCSELs can exist at the same time by adjusting the injection intensity and frequency detuning between the lasers by polarization rotation coupling, and the output power of each polarization component is equal. In the system, the injection intensity and frequency detuning of the unidirectional polarization rotation coupling have a significant effect on the TDS of the six-channel signal output by the system. In the case of fixed injection intensity or frequency detuning, the TDS peak of each polarization component output signal can be restrained below 0.2 by adjusting other system parameters. By synthetically analyzing the influence of the combination of injection intensity and frequency detuning on the output signal TDS of the system, the precise range of coupling parameters of the TDS which can effectively suppress the chaotic signals is determined. By further optimizing the parameter range of the system, it can be ensured that there is a strong correlation between the two polarization components of only one VCSEL output signal in the six-channel output signal, but the correlation between the output signals of different VCSELs polarization components is weaker. Therefore, the system can output six chaotic signals effectively suppressed by TDS at the same time, and the correlation of three chaotic signals is weak.
【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】：TN248
本文编号：2333107
[Abstract]:In recent years, with the rapid development of information technology, chaotic laser signals generated by semiconductor lasers have become the focus of attention due to their great application prospects in high speed secure communication, chaotic radar and high speed random number generation. Generally, semiconductor lasers can produce chaotic signals under external disturbances such as optical feedback, optical injection and optoelectronic feedback. Among them, the chaotic signal generated by optical feedback will inevitably retain a certain time delay characteristic (TDS), which is not conducive to the application of chaotic laser signal in the field of chaotic secure communication and random number generation. Therefore, it is necessary to effectively suppress the TDS of chaotic signals by appropriate methods. In particular, the vertical cavity surface emitting laser (VCSELs) may have two orthogonal polarization components (X-PC-Y-PC) at the same time under appropriate conditions. Three or more VCSELs are used to form a ring system. In theory, multiple chaotic laser signals can be generated at the same time. If the system is used as a chaotic entropy source, it is possible to produce multiple random bit sequences at the same time. In this paper, a scheme for obtaining high quality chaotic signals from a ring system based on three unidirectional polarization rotation coupling 1550 nm-VCSELs is proposed. Based on the spin inversion model, the nonlinear dynamic characteristics of the output signals of three laser polarization components in the system are studied theoretically. The autocorrelation and mutual information methods are used to analyze the TDS, of each polarization component output time series and the correlation characteristics between the polarization components are discussed by using the cross-correlation function. The results show that the six polarization components of three 1550 nm-VCSELs can exist at the same time by adjusting the injection intensity and frequency detuning between the lasers by polarization rotation coupling, and the output power of each polarization component is equal. In the system, the injection intensity and frequency detuning of the unidirectional polarization rotation coupling have a significant effect on the TDS of the six-channel signal output by the system. In the case of fixed injection intensity or frequency detuning, the TDS peak of each polarization component output signal can be restrained below 0.2 by adjusting other system parameters. By synthetically analyzing the influence of the combination of injection intensity and frequency detuning on the output signal TDS of the system, the precise range of coupling parameters of the TDS which can effectively suppress the chaotic signals is determined. By further optimizing the parameter range of the system, it can be ensured that there is a strong correlation between the two polarization components of only one VCSEL output signal in the six-channel output signal, but the correlation between the output signals of different VCSELs polarization components is weaker. Therefore, the system can output six chaotic signals effectively suppressed by TDS at the same time, and the correlation of three chaotic signals is weak.
【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】：TN248
【参考文献】
相关期刊论文 前7条
1 杨欣;陈建军;吴正茂;夏光琼;黄守文;邓涛;;光电负反馈下1550nm垂直腔表面发射激光器的动力学特性[J];光子学报;2016年08期
2 魏丽霞;唐曦;吴正茂;夏光琼;;基于双光反馈垂直腔面发射激光器获取双路高速物理随机数研究[J];光电子·激光;2015年11期
3 郑安杰;吴正茂;邓涛;李小坚;夏光琼;;偏振保持光反馈下1550 nm垂直腔面发射激光器的非线性动力学特性研究[J];物理学报;2012年23期
4 颜森林;;外部光注入空间耦合半导体激光器高维混沌系统的增频与控制研究[J];物理学报;2012年16期
5 王云才;;混沌激光的产生与应用[J];激光与光电子学进展;2009年04期
6 李孝峰,潘炜,罗斌,马冬,赵峥,邓果;Theoretical study on controlling nonlinear behaviors of a coupled-cavity VCSEL by external optical injection[J];Chinese Optics Letters;2004年05期
7 赵耿,郑德玲,张亦舜;混沌学及混沌电子学的发展[J];原子能科学技术;2002年03期
，本文编号：2333107
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2333107.html
