本文選題：垂直腔面發(fā)射半導(dǎo)體激光器(VCSELs) + 混沌�。� 參考：《西南大學(xué)》2015年碩士論文

【摘要】：隨著信息技術(shù)的飛速發(fā)展,人們對(duì)信息的高速率、高保密性能有著越來(lái)越高的需求。近年來(lái),基于半導(dǎo)體激光器的混沌保密通信因其所展現(xiàn)的巨大應(yīng)用前景而成為研究者關(guān)注的焦點(diǎn)之一。通常情況下,半導(dǎo)體激光器在外部擾動(dòng)(如外部延遲反饋)下可獲得復(fù)雜的混沌輸出。然而伴隨著外部延遲機(jī)制的引入,該系統(tǒng)所輸出的混沌信號(hào)也通常具有了明顯的時(shí)延特征。這些明顯的時(shí)延特征給竊密者提供了可利用來(lái)破解重構(gòu)混沌載波的線索,從而使得激光混沌通信的系統(tǒng)安全性受到了威脅。因此,研究半導(dǎo)體激光混沌系統(tǒng)的時(shí)延特征具有重要的意義。目前人們對(duì)半導(dǎo)體激光混沌系統(tǒng)的時(shí)延特征研究大多關(guān)注于光場(chǎng)的強(qiáng)度部分(即強(qiáng)度時(shí)延特征,I-TDS)。其實(shí)半導(dǎo)體激光器輸出的光場(chǎng)包含強(qiáng)度和相位兩部分。近年來(lái)的相關(guān)研究發(fā)現(xiàn)即使外腔反饋半導(dǎo)體激光器的混沌輸出的光場(chǎng)強(qiáng)度時(shí)延特征得到了抑制,而其光場(chǎng)相位中的時(shí)延特征(P-TDS)還是比較明顯的,這仍然給竊密者提供了可能的攻擊線索。針對(duì)P-TDS問(wèn)題,目前相關(guān)的研究主要集中在DFB激光器構(gòu)建的混沌系統(tǒng)。而近年來(lái)發(fā)展迅猛的垂直腔面發(fā)射激光器(VCSELs),與DFB激光器相比,具有低閾值電流、高光纖耦合率等獨(dú)特優(yōu)勢(shì)。當(dāng)前對(duì)基于VCSELs的混沌系統(tǒng)的P-TDS研究還非常缺乏。因此,研究基于VCSELs的混沌系統(tǒng)的P-TDS問(wèn)題,對(duì)于獲得新型的低時(shí)延特征混沌源以及發(fā)展高安全性能的混沌保密通信系統(tǒng)都具有重要的意義�；谧孕崔D(zhuǎn)模型,本文分別系統(tǒng)地分析了互耦VCSELs系統(tǒng)混沌輸出的P-TDS和主副VCSELs系統(tǒng)混沌輸出的TDS及其帶寬(BW)。首先,對(duì)于互耦VCSELs系統(tǒng),運(yùn)用自相關(guān)函數(shù)(SF)和排列熵(PE)方法,分析了耦合強(qiáng)度、頻率失諧對(duì)系統(tǒng)混沌輸出P-TDS的影響,并與I-TDS進(jìn)行了比較。研究結(jié)果表明：在較弱的耦合強(qiáng)度作用下,混沌I-TDS很弱而P-TDS卻比較明顯；在合適的耦合強(qiáng)度下,混沌P-TDS和I-TDS可以同時(shí)得到抑制。通過(guò)進(jìn)一步考察頻率失諧對(duì)TDS的影響,確定了互耦VCSELs系統(tǒng)同時(shí)輸出四路P-TDS和I-TDS均得到有效抑制的混沌信號(hào)所需的參數(shù)范圍。其次,針對(duì)主副VCSELs系統(tǒng),數(shù)值研究了系統(tǒng)輸出的動(dòng)力學(xué)特性；并分析了注入強(qiáng)度、主激光器(M-VCSEL)與副激光器(S-VCSEL)之間的頻率失諧以及M-VCSEL所受到的光反饋強(qiáng)度對(duì)系統(tǒng)混沌輸出TDS(包括I-TDS和P-TDS)以及輸出BW的影響。研究結(jié)果表明：在合適的注入強(qiáng)度和頻率失諧下,該混沌系統(tǒng)輸出的兩個(gè)偏振分量(X-PC和Y-PC)中的P-TDS和I-TDS均可以得到有效抑制。進(jìn)一步的,通過(guò)分析注入強(qiáng)度對(duì)混沌BW的影響,發(fā)現(xiàn)在較大負(fù)頻率失諧區(qū)域,系統(tǒng)可輸出BW超過(guò)30GHz的X-PC和Y-PC混沌信號(hào)；結(jié)合系統(tǒng)輸出混沌的TDS與BW特性,通過(guò)選擇合適的注入?yún)?shù),可得到寬帶寬、低時(shí)延特征的混沌信號(hào)輸出。此外,在一定的注入強(qiáng)度下,通過(guò)合理選擇反饋強(qiáng)度,可以顯著優(yōu)化系統(tǒng)的混沌信號(hào)輸出。
[Abstract]:With the rapid development of information technology, people have higher and higher demand for the high rate and high security of information. In recent years, chaotic secure communication based on semiconductor lasers has become one of the focus of researchers due to its great application prospect. In general, the semiconductor laser can obtain complex chaotic output under external disturbances (such as external delay feedback). However, with the introduction of the external delay mechanism, the chaotic signal output by the system usually has obvious delay characteristics. These obvious time-delay features provide clues to the burglars to decipher and reconstruct chaotic carriers, which threaten the security of laser chaotic communication systems. Therefore, it is of great significance to study the delay characteristics of semiconductor laser chaotic systems. At present, most of the researches on the time delay characteristics of semiconductor laser chaotic systems are focused on the intensity part of the light field (I. e., the intensity delay characteristic / I-TDSs). In fact, the semiconductor laser output field consists of intensity and phase. In recent years, it has been found that even though the optical field intensity delay characteristics of chaotic output of external cavity feedback semiconductor laser are suppressed, the time-delay characteristic of the optical field phase is still obvious. This still gives the snitch a possible clue to the attack. For the P-TDS problem, the current research focuses on chaotic systems constructed by DFB lasers. Compared with DFB lasers, the VCSELs laser with rapid development in recent years has the unique advantages of low threshold current, high fiber coupling rate and so on. At present, the research on P-TDS of chaotic system based on VCSELs is still very scarce. Therefore, it is of great significance to study the P-TDS problem of chaotic systems based on VCSELs for obtaining new low delay characteristic chaotic sources and developing high security chaotic secure communication systems. Based on the spin reversal model, this paper systematically analyzes the TDS and the bandwidth of the chaotic output of the mutually coupled VCSELs system and the primary and secondary VCSELs system, respectively. Firstly, the influence of coupling strength and frequency detuning on the chaotic output P-TDS of the system is analyzed by using the autocorrelation function (SF) and permutation entropy (P) method for the mutually coupled VCSELs system, and the results are compared with that of I-TDS. The results show that the chaotic I-TDS is weak but the P-TDS is obvious under the weak coupling intensity, and the chaotic P-TDS and I-TDS can be suppressed simultaneously under the appropriate coupling intensity. By further investigating the influence of frequency detuning on TDS, the parameter range required for the mutually coupled VCSELs system to output four P-TDS and I-TDS signals simultaneously to suppress chaos effectively is determined. Secondly, the dynamic characteristics of the system output are numerically studied for the principal and secondary VCSELs system, and the injection intensity is analyzed. The frequency detuning between the main laser (M-VCSEL) and the secondary laser (S-VCSEL) and the influence of the optical feedback intensity of M-VCSEL on the chaotic output TDSs (including I-TDS and P-TDSs) and output BW of the system. The results show that the P-TDS and I-TDS in the two polarization components (X-PC and Y-PC) of the chaotic system can be effectively suppressed under the appropriate injection intensity and frequency detuning. Furthermore, by analyzing the effect of injection intensity on chaos BW, it is found that in the larger negative frequency detuning region, the system can output X-PC and Y-PC chaotic signals whose BW exceeds 30GHz, and combines the TDS and BW characteristics of chaos output by the system. By selecting the appropriate injection parameters, the output of the chaotic signal with wide bandwidth and low delay can be obtained. In addition, under a certain injection intensity, the chaotic signal output of the system can be significantly optimized by reasonably selecting the feedback intensity.
【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN248.4;O415.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 王云才;;混沌激光的產(chǎn)生與應(yīng)用[J];激光與光電子學(xué)進(jìn)展;2009年04期

2 洪芳柏;祝寶良;;走近混沌[J];科學(xué)24小時(shí);2006年12期

3 張繼兵;張建忠;楊毅彪;梁君生;王云才;;外腔半導(dǎo)體激光器隨機(jī)數(shù)熵源的腔長(zhǎng)分析[J];物理學(xué)報(bào);2010年11期

4 趙耿,鄭德玲,張亦舜;混沌學(xué)及混沌電子學(xué)的發(fā)展[J];原子能科學(xué)技術(shù);2002年03期

5 陳于淋;吳正茂;唐曦;林曉東;魏月;夏光瓊;;基于雙光注入鎖定1550nm垂直腔表面發(fā)射半導(dǎo)體激光器產(chǎn)生可調(diào)諧毫米波[J];物理學(xué)報(bào);2013年10期

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