可控的全光混沌逻辑运算和实时混沌雷达测距

发布时间：2018-01-17 20:06

本文关键词：可控的全光混沌逻辑运算和实时混沌雷达测距　出处：《五邑大学》2017年硕士论文　论文类型：学位论文

【摘要】：垂直腔表面发射激光器(VCSEL),作为微型腔激光器之一,具有很多优点:低制造成本,低阈值电流,结构紧凑,圆形输出光束轮廓和大规模集成。基于外部光注入或光反馈的VCSEL,作为混沌激光光源,可以很容易产生非常大的带宽和高维的混沌信号,并且具有很强的抗干扰能力。它可广泛应用于混沌光学传感、光学逻辑门和混沌计算、高速率随机码产生、混沌保密通信、激光混沌雷达测距等领域。当外部光注入VCSEL混沌系统应用于全光混沌逻辑门和激光混沌雷达测距时,一些关键技术和物理机制需要亟待解决和突破,为此,在本文中,我们做了一些创新性研究工作,其内容主要如下:(1)基于外光注入VCSEL偏振转换机制,以及新的电光调制理论,将激光器输出的两个线性偏振光作为两个逻辑输出。在电光调制作用下,其中一个逻辑输出与另一个逻辑输出之间实现逻辑非运算。对于相同的逻辑输入信号,通过控制两个逻辑输入信号间外加电场的逻辑操作,在光域内实现了各种数字信号处理(AND,OR,XNOR,NAND,NOR和XOR)。在此基础上,进一步实现了半加法器逻辑运算。该工作在论文的第三章完成。(2)基于注入光场的频率失谐,利用偏振双稳态动力学特性,在级联外部注入VCSEL中,实现了可靠的全光逻辑门。这里,两个逻辑输入通过来自于可调谐连续波(CW)激光器的频率失谐来编码。逻辑输出从光注入VCSEL的两个正交偏振光来译码。对于同样的逻辑输入,在电光调制下,通过控制外电场的逻辑操作,实现了不同的全光逻辑数字处理(NOT,AND,NAND,XOR,XNOR,OR,NOR)。使用广义混沌同步机制,我们也探索它们的延时存储。同时,为了量化这些逻辑门的可靠性,进一步论述了它们的成功概率。该工作在论文的第四章完成。(3)基于驱动-响应VCSEL的混沌同步系统,根据完全混沌同步原理和希尔伯特相位变换原理,我们提出了一个新颖的混沌激光雷达实时多目标测距方案。在此方案中,利用周期性极化铌酸锂晶体的线性电光效应,我们分别在驱动和响应部分对激光器输出的x和y偏振分量进行电光调制,使两偏振分量处于稳定的混沌同步状态。同时探讨了当两偏振分量混沌雷达达到上述同步条件时,系统关键参数(如偏置电流、外加电场、信道延时)的取值范围。在稳定的完全混沌同步条件下,x和y混沌偏振分量作为混沌雷达源,分别对两个不同位置目标进行测距。结果表明,待测目标的测量距离实时稳定性好,只有轻微瞬时抖动,其精度达到毫米量级;两偏振分量的信噪比较高且实时稳定性好,目标测距相对误差较小,在2.7%以内。该工作在论文的第五章完成。
[Abstract]:Vertical cavity surface emitting laser (VCSELL), as one of the micro cavity lasers, has many advantages: low manufacturing cost, low threshold current and compact structure. Circular output beam profile and large-scale integration. VCSEL-based external light injection or optical feedback, as a chaotic laser source, can easily produce very large bandwidth and high-dimensional chaotic signal. It can be widely used in chaotic optical sensing, optical logic gates and chaotic computation, high rate random code generation, chaotic secure communication. When the external light injection VCSEL chaotic system is applied to all optical chaotic logic gates and laser chaotic radar ranging, some key technologies and physical mechanisms need to be solved and breakthrough. Therefore, in this paper, we do some innovative research work, the main content of which is as follows: 1) based on the polarization conversion mechanism of external optical injection (VCSEL) and the new electro-optic modulation theory. Two linearly polarized light output from the laser are regarded as two logic outputs. Under electro-optic modulation, one logic output and the other logic output are not operated logically. For the same logic input signal. By controlling the logic operation of the applied electric field between the two logical input signals, various digital signal processing systems are implemented in the optical domain. NOR and XOR.Based on this, we further implement the semi-adder logic operation, which is completed in the third chapter of the thesis, and based on the frequency detuning of the injected light field. Using the dynamic characteristics of polarization bistable state, a reliable all-optical logic gate is realized in the cascade external injection VCSEL. Two logical inputs are encoded by frequency detuning from a tunable CW CW) laser. The logic output is decoded from two orthogonal polarized light injected into the VCSEL. For the same logical input. Under electro-optic modulation, by controlling the logic operation of external electric field, different all optical logic digital processing is realized. In order to quantify the reliability of these logic gates, we also explore their delay storage using generalized chaotic synchronization mechanisms. Their success probability is further discussed. This work is completed in Chapter 4th of this paper. The chaotic synchronization system is based on drive-response VCSEL. Based on the principle of complete chaos synchronization and Hilbert phase transformation, we propose a novel real-time multi-target ranging scheme for chaotic lidar. Using the linear electro-optic effect of periodically polarized lithium niobate crystal, we modulate the x and y polarization components of the laser output in the drive and response parts, respectively. At the same time, the key parameters of the system, such as bias current and electric field, are discussed when the chaotic radar with two polarization components reaches the above synchronization condition. Under the condition of stable complete chaos synchronization, x and y chaotic polarization components are used as chaotic radar sources to range the two targets at different positions respectively. The results show that. The measurement distance of the target under test has good real time stability, only slight instantaneous jitter, and its precision reaches millimeter level. The signal-to-noise ratio of the two polarization components is high, the real-time stability is good, and the relative error of target ranging is less than 2.7%. This work was completed in Chapter 5th of this paper.
【学位授予单位】：五邑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248;TN953

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