本文關(guān)鍵詞：可控的全光混沌邏輯運算和實時混沌雷達測距　出處：《五邑大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 垂直腔表面發(fā)射激光器 偏振轉(zhuǎn)換 邏輯門 混沌同步 混沌雷達

【摘要】：垂直腔表面發(fā)射激光器(VCSEL),作為微型腔激光器之一,具有很多優(yōu)點:低制造成本,低閾值電流,結(jié)構(gòu)緊湊,圓形輸出光束輪廓和大規(guī)模集成�；谕獠抗庾⑷牖蚬夥答伒腣CSEL,作為混沌激光光源,可以很容易產(chǎn)生非常大的帶寬和高維的混沌信號,并且具有很強的抗干擾能力。它可廣泛應(yīng)用于混沌光學傳感、光學邏輯門和混沌計算、高速率隨機碼產(chǎn)生、混沌保密通信、激光混沌雷達測距等領(lǐng)域。當外部光注入VCSEL混沌系統(tǒng)應(yīng)用于全光混沌邏輯門和激光混沌雷達測距時,一些關(guān)鍵技術(shù)和物理機制需要亟待解決和突破,為此,在本文中,我們做了一些創(chuàng)新性研究工作,其內(nèi)容主要如下:(1)基于外光注入VCSEL偏振轉(zhuǎn)換機制,以及新的電光調(diào)制理論,將激光器輸出的兩個線性偏振光作為兩個邏輯輸出。在電光調(diào)制作用下,其中一個邏輯輸出與另一個邏輯輸出之間實現(xiàn)邏輯非運算。對于相同的邏輯輸入信號,通過控制兩個邏輯輸入信號間外加電場的邏輯操作,在光域內(nèi)實現(xiàn)了各種數(shù)字信號處理(AND,OR,XNOR,NAND,NOR和XOR)。在此基礎(chǔ)上,進一步實現(xiàn)了半加法器邏輯運算。該工作在論文的第三章完成。(2)基于注入光場的頻率失諧,利用偏振雙穩(wěn)態(tài)動力學特性,在級聯(lián)外部注入VCSEL中,實現(xiàn)了可靠的全光邏輯門。這里,兩個邏輯輸入通過來自于可調(diào)諧連續(xù)波(CW)激光器的頻率失諧來編碼。邏輯輸出從光注入VCSEL的兩個正交偏振光來譯碼。對于同樣的邏輯輸入,在電光調(diào)制下,通過控制外電場的邏輯操作,實現(xiàn)了不同的全光邏輯數(shù)字處理(NOT,AND,NAND,XOR,XNOR,OR,NOR)。使用廣義混沌同步機制,我們也探索它們的延時存儲。同時,為了量化這些邏輯門的可靠性,進一步論述了它們的成功概率。該工作在論文的第四章完成。(3)基于驅(qū)動-響應(yīng)VCSEL的混沌同步系統(tǒng),根據(jù)完全混沌同步原理和希爾伯特相位變換原理,我們提出了一個新穎的混沌激光雷達實時多目標測距方案。在此方案中,利用周期性極化鈮酸鋰晶體的線性電光效應(yīng),我們分別在驅(qū)動和響應(yīng)部分對激光器輸出的x和y偏振分量進行電光調(diào)制,使兩偏振分量處于穩(wěn)定的混沌同步狀態(tài)。同時探討了當兩偏振分量混沌雷達達到上述同步條件時,系統(tǒng)關(guān)鍵參數(shù)(如偏置電流、外加電場、信道延時)的取值范圍。在穩(wěn)定的完全混沌同步條件下,x和y混沌偏振分量作為混沌雷達源,分別對兩個不同位置目標進行測距。結(jié)果表明,待測目標的測量距離實時穩(wěn)定性好,只有輕微瞬時抖動,其精度達到毫米量級;兩偏振分量的信噪比較高且實時穩(wěn)定性好,目標測距相對誤差較小,在2.7%以內(nèi)。該工作在論文的第五章完成。
[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.
【學位授予單位】：五邑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN248;TN953

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