高非线性光纤环路镜对光反馈下半导体激光器混沌带宽及延时特征影响的研究
发布时间：2018-10-05 11:54
【摘要】：基于半导体激光器所产生的混沌光信号因在混沌保密通信、混沌雷达、真随机数的产生以及时域反射器等诸多领域的应用受到广泛的关注。通常,半导体激光器主要通过引入光反馈、光电反馈、光注入和电流调制等外部扰动方式来获取混沌信号。其中,光反馈方式因结构简单、易于集成、成本较低、容易控制等特点而成为产生混沌光信号的主要方法。但基于光反馈方式获取的混沌信号带宽通常仅有几GHz且具有明显的延时特征(TDS)。这不仅限制了混沌保密通信的信息传输速率,且大大降低了系统通信的安全性。因此,研究获取TDS明显抑制的、频谱平坦的宽带混沌信号的相关理论和技术具有重要的意义。本文提出了利用由高非线性光纤(HNLF)和光纤耦合器(FC)构成的高非线性光纤环路镜(HNFLM)获取TDS被明显抑制的宽带混沌信号的方法。利用标准带宽、自相关函数(ACF)的方法,理论研究了HNFLM对光反馈作用下分布反馈半导体激光器(DFB-SL)输出的混沌信号的带宽及其TDS的影响。研究结果表明:当光反馈DFB-SL产生的混沌光信号通过由功分比(PSR)为7:3的FC以及长度为35 M的HNLF构成的HNFLM后,混沌信号带宽由12.3 GHz提高到41.2 GHz,且其时间序列的ACF在延迟时间附近的最大值σ从0.22减少至0.05。混沌信号带宽增强以及TDS抑制的效果与入射混沌信号的平均功率、高非线性光纤长度、光纤耦合器的PSR有关。其中,混沌信号延时特征主要受PSR的影响。此外,我们绘制了在光纤耦合器的PSR为7:3时,混沌信号带宽及TDS在混沌信号的平均功率、高非线性光纤长度构成的参数空间内的分布图谱,确定了利用高非线性光纤环路镜获取低TDS的宽带混沌信号的最佳参数空间。
[Abstract]:Chaotic optical signals based on semiconductor lasers have been widely used in chaotic secure communication, chaotic radar, the generation of true random numbers and time domain reflectors. Generally, semiconductor lasers obtain chaotic signals by introducing external disturbances such as optical feedback, optoelectronic feedback, optical injection and current modulation. Because of its simple structure, easy integration, low cost and easy control, optical feedback is the main method to generate chaotic optical signals. However, the bandwidth of chaotic signals based on optical feedback is usually only a few GHz and has obvious delay characteristic (TDS). This not only limits the information transmission rate of chaotic secure communication, but also greatly reduces the security of system communication. Therefore, it is of great significance to study the theory and technology of obtaining wideband chaotic signals obviously suppressed by TDS. In this paper, a method of obtaining wideband chaotic signal of TDS is presented by using the high nonlinear fiber loop mirror (HNFLM) which is composed of high nonlinear fiber (HNLF) and fiber coupler (FC). Using the method of standard bandwidth and autocorrelation function (ACF), the influence of HNFLM on the bandwidth of chaotic signal and the influence of TDS on the chaotic signal of distributed feedback semiconductor laser (DFB-SL) under optical feedback are studied theoretically. The results show that when the chaotic optical signal generated by optical feedback DFB-SL passes through a HNFLM composed of a FC with a power fraction of 7:3 (PSR) and a HNLF with a length of 35m, The bandwidth of chaotic signal is increased from 12. 3 GHz to 41. 2 GHz, and the maximum 蟽 of ACF of its time series is reduced from 0. 22 to 0. 05. The enhancement of chaotic signal bandwidth and the effect of TDS suppression are related to the average power of the incident chaotic signal, the high nonlinear fiber length and the PSR of the fiber coupler. Among them, the delay characteristic of chaotic signal is mainly influenced by PSR. In addition, when the PSR of the fiber coupler is 7:3, the distribution of the chaotic signal bandwidth and the TDS in the parameter space composed of the average power of the chaotic signal and the length of the high nonlinear fiber are plotted. The optimal parameter space for obtaining wideband chaotic signals with low TDS using high nonlinear fiber loop mirror is determined.
【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】：TN248.4
本文编号：2253284
[Abstract]:Chaotic optical signals based on semiconductor lasers have been widely used in chaotic secure communication, chaotic radar, the generation of true random numbers and time domain reflectors. Generally, semiconductor lasers obtain chaotic signals by introducing external disturbances such as optical feedback, optoelectronic feedback, optical injection and current modulation. Because of its simple structure, easy integration, low cost and easy control, optical feedback is the main method to generate chaotic optical signals. However, the bandwidth of chaotic signals based on optical feedback is usually only a few GHz and has obvious delay characteristic (TDS). This not only limits the information transmission rate of chaotic secure communication, but also greatly reduces the security of system communication. Therefore, it is of great significance to study the theory and technology of obtaining wideband chaotic signals obviously suppressed by TDS. In this paper, a method of obtaining wideband chaotic signal of TDS is presented by using the high nonlinear fiber loop mirror (HNFLM) which is composed of high nonlinear fiber (HNLF) and fiber coupler (FC). Using the method of standard bandwidth and autocorrelation function (ACF), the influence of HNFLM on the bandwidth of chaotic signal and the influence of TDS on the chaotic signal of distributed feedback semiconductor laser (DFB-SL) under optical feedback are studied theoretically. The results show that when the chaotic optical signal generated by optical feedback DFB-SL passes through a HNFLM composed of a FC with a power fraction of 7:3 (PSR) and a HNLF with a length of 35m, The bandwidth of chaotic signal is increased from 12. 3 GHz to 41. 2 GHz, and the maximum 蟽 of ACF of its time series is reduced from 0. 22 to 0. 05. The enhancement of chaotic signal bandwidth and the effect of TDS suppression are related to the average power of the incident chaotic signal, the high nonlinear fiber length and the PSR of the fiber coupler. Among them, the delay characteristic of chaotic signal is mainly influenced by PSR. In addition, when the PSR of the fiber coupler is 7:3, the distribution of the chaotic signal bandwidth and the TDS in the parameter space composed of the average power of the chaotic signal and the length of the high nonlinear fiber are plotted. The optimal parameter space for obtaining wideband chaotic signals with low TDS using high nonlinear fiber loop mirror is determined.
【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】：TN248.4
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