本文選題：半導(dǎo)體環(huán)形激光器 + 不可預(yù)測度　； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：隨著現(xiàn)代化信息技術(shù)的發(fā)展,混沌保密通信系統(tǒng)的安全性受到了一定的威脅。一方面,由于時間序列分析方法的不斷進(jìn)步,使得竊聽者可以成功恢復(fù)混沌載波信號的時延信息；另一方面,載波信號的不確定性也影響著系統(tǒng)的安全。半導(dǎo)體環(huán)形激光器(semiconductor ring laser, SRL)作為一種新型光源,在激光混沌通信系統(tǒng)中起著非常重要的作用。SRL的諧振腔可以使激光器工作在順時針和逆時針兩個方向,為增強激光混沌通信系統(tǒng)的安全性提供可能。本文從提高載波信號的安全性出發(fā),定量分析了兩個混沌通信系統(tǒng)載波信號的不可預(yù)測度和時延信息隱藏。首先,研究了基于主-從式平行注入半導(dǎo)體環(huán)形激光器混沌載波產(chǎn)生方案,借助量化工具排列熵,從對稱注入和非對稱注入兩個角度定量分析從激光器輸出信號的不可預(yù)測程度,同時分析了輸出信號帶寬。結(jié)果表明：從激光器輸出信號的不可預(yù)測性高于主激光器,該方案可以產(chǎn)生優(yōu)于單一SRL的載波信號；非零高失諧頻率下,非對稱注入有利于實現(xiàn)載波信號不可預(yù)測度增強,排列熵值可達(dá)到0.8；載波信號帶寬主要受失諧頻率影響,負(fù)失諧可以顯著增強的載波信號帶寬：選擇適當(dāng)?shù)淖⑷霃姸燃柏?fù)失諧頻率,從激光器可以輸出兩路高不可預(yù)測度及帶寬增強的載波信號,一定程度上提高了在混沌保密通信系統(tǒng)的安全性。然后,研究了基于自反饋式平行互注入半導(dǎo)體環(huán)形激光器(SF-PMISRLs)混沌通信方案,并與平行互注入半導(dǎo)體環(huán)形激光器(PMISRLs)混沌通信系統(tǒng)進(jìn)行對比。針對對稱和非對稱兩種注入方式,利用自相關(guān)函數(shù)的峰／谷最大值定量分析混沌強度時間序列的時延標(biāo)記,借助量化工具排列熵分析混沌強度時間序列的不可預(yù)測度特性。結(jié)果表明：SF-PMISRLs系統(tǒng)與PMISRLs系統(tǒng)相比,前者滿足時延隱藏的參數(shù)區(qū)域隨失諧頻率的增大而拓寬,后者對應(yīng)的參數(shù)區(qū)域范圍較窄,說明SF-PMISRLs系統(tǒng)可以使時延信息有效隱藏,特別地,在高失諧頻率下選擇非對稱注入使得該系統(tǒng)時延信息隱藏效果最佳；SF-PMISRLs系統(tǒng)和PMISRLs系統(tǒng)相比,二者實現(xiàn)；不可預(yù)測性增強的參數(shù)區(qū)域基本相同,選擇高失諧頻率和適當(dāng)注入強度大小可以有效提高SRL輸出信號的不可預(yù)測度。
[Abstract]:With the development of modern information technology, the security of chaotic secure communication system is threatened. On the one hand, due to the development of time series analysis methods, eavesdroppers can successfully recover the delay information of chaotic carrier signals; on the other hand, the uncertainty of carrier signals also affects the security of the system. As a new type of light source, semiconductor ring laser, SRL) plays a very important role in laser chaotic communication system. The resonator of semiconductor ring laser can make the laser work in both clockwise and counterclockwise directions. It is possible to enhance the security of laser chaotic communication system. In order to improve the security of carrier signals, the unpredictability and delay information hiding of carrier signals in two chaotic communication systems are quantitatively analyzed in this paper. Firstly, chaotic carrier generation scheme based on master-slave parallel injection semiconductor ring laser is studied, and entropy is arranged by quantization tool. The unpredictable degree of output signal of laser is quantitatively analyzed from two angles of symmetric injection and asymmetric injection, and the bandwidth of output signal is analyzed at the same time. The results show that the unpredictability of the output signal from the laser is higher than that of the main laser, and the scheme can produce a carrier signal better than the single SRL, and the asymmetric injection can enhance the unpredictability of the carrier signal at the non-zero high detuning frequency. The carrier signal bandwidth is mainly affected by detuning frequency, and the carrier signal bandwidth which can be significantly enhanced by negative detuning can be selected with proper injection intensity and negative detuning frequency. Two carrier signals with high unpredictability and bandwidth enhancement can be output from the laser, which improves the security of chaotic secure communication system to a certain extent. Then, the chaotic communication scheme based on self-feedback parallel mutual injection semiconductor ring laser (SF-PMISRLs) is studied and compared with the parallel mutual injection semiconductor ring laser (PMISRLs) chaotic communication system. For symmetric and asymmetric injection modes, the time-delay markers of chaotic intensity time series are quantitatively analyzed by using the peak / valley maximum of autocorrelation function, and the unpredictable degree characteristics of chaotic intensity time series are analyzed by means of quantization tool permutation entropy. The results show that compared with PMISRLs system, the parameter region of the former can be widened with the increase of detuning frequency, and the parameter range of the latter is narrower, which indicates that the delay information can be effectively hidden by the SF-PMISRLs system, especially when the detuning frequency increases. Under the condition of high detuning frequency, the asymmetric injection makes the delay information hiding effect of the system best compared with that of PMISRLs system, and the unpredictability enhancement parameter region is basically the same. The unpredictability of SRL output signal can be improved by choosing high detuning frequency and proper injection intensity.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248.4

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本文編號：1936197