【摘要】：近年來(lái),隨著信息技術(shù)的快速發(fā)展,利用半導(dǎo)體激光器產(chǎn)生的混沌激光信號(hào)因其在高速保密通信、混沌雷達(dá)以及高速隨機(jī)數(shù)產(chǎn)生等方面的巨大應(yīng)用前景而成為人們關(guān)注的焦點(diǎn)。通常,半導(dǎo)體激光器在光反饋、光注入及光電反饋等外部擾動(dòng)作用下可產(chǎn)生混沌信號(hào)。其中,通過(guò)引入光反饋產(chǎn)生的混沌信號(hào)會(huì)不可避免的保留一定的時(shí)間延遲特征(TDS),這不利于混沌激光信號(hào)在混沌保密通信及隨機(jī)數(shù)產(chǎn)生等領(lǐng)域的應(yīng)用。因此,有必要采用適當(dāng)方法對(duì)混沌信號(hào)的TDS進(jìn)行有效抑制。特別地,垂直腔面發(fā)射激光器(VCSELs)在適當(dāng)條件下可能同時(shí)存在兩個(gè)相互正交的偏振分量(X-PC,Y-PC),將三個(gè)及以上VCSELs構(gòu)成環(huán)形系統(tǒng),理論上可同時(shí)產(chǎn)生多路混沌激光信號(hào)。若將此系統(tǒng)作為混沌熵源,則具有同時(shí)產(chǎn)生多路隨機(jī)比特序列的可能性。本文提出了一種基于三個(gè)單向偏振旋轉(zhuǎn)耦合1550 nm-VCSELs構(gòu)成的環(huán)形系統(tǒng)獲取多路高質(zhì)量混沌信號(hào)的方案。利用自旋反轉(zhuǎn)模型,理論研究了該系統(tǒng)中三個(gè)激光器各偏振分量輸出信號(hào)的非線性動(dòng)力學(xué)特性;采用自相關(guān)和互信息方法分析了各偏振分量輸出時(shí)間序列的TDS,并利用互相關(guān)函數(shù)討論了各偏振分量之間的相關(guān)特性。研究結(jié)果表明:采用偏振旋轉(zhuǎn)耦合的方式,通過(guò)合理調(diào)節(jié)各激光器之間的注入強(qiáng)度和頻率失諧,三個(gè)1550 nm-VCSELs的六個(gè)偏振分量能同時(shí)存在,且各偏振分量的輸出功率相當(dāng);系統(tǒng)中單向偏振旋轉(zhuǎn)耦合的注入強(qiáng)度和頻率失諧對(duì)該系統(tǒng)輸出的六路信號(hào)的TDS均有顯著影響;對(duì)于分別固定注入強(qiáng)度或頻率失諧的情況,通過(guò)調(diào)節(jié)其他系統(tǒng)參量可使各偏振分量輸出信號(hào)的TDS峰值均被抑制到0.2以下;通過(guò)綜合分析注入強(qiáng)度和頻率失諧聯(lián)合作用對(duì)系統(tǒng)輸出信號(hào)TDS的影響,確定了能有效抑制各路混沌信號(hào)TDS的耦合參數(shù)取值的精確范圍;通過(guò)進(jìn)一步優(yōu)化系統(tǒng)參數(shù)范圍,可保證六路輸出信號(hào)中僅同一個(gè)VCSEL輸出的兩偏振分量之間存在較強(qiáng)的相關(guān)性,而不同VCSELs偏振分量輸出信號(hào)之間的相關(guān)性均較弱。因此,該系統(tǒng)能同時(shí)輸出六路TDS被有效抑制的混沌信號(hào),且其中三路混沌信號(hào)的相關(guān)性較弱。
[Abstract]:In recent years, with the rapid development of information technology, chaotic laser signals generated by semiconductor lasers have become the focus of attention due to their great application prospects in high speed secure communication, chaotic radar and high speed random number generation. Generally, semiconductor lasers can produce chaotic signals under external disturbances such as optical feedback, optical injection and optoelectronic feedback. Among them, the chaotic signal generated by optical feedback will inevitably retain a certain time delay characteristic (TDS), which is not conducive to the application of chaotic laser signal in the field of chaotic secure communication and random number generation. Therefore, it is necessary to effectively suppress the TDS of chaotic signals by appropriate methods. In particular, the vertical cavity surface emitting laser (VCSELs) may have two orthogonal polarization components (X-PC-Y-PC) at the same time under appropriate conditions. Three or more VCSELs are used to form a ring system. In theory, multiple chaotic laser signals can be generated at the same time. If the system is used as a chaotic entropy source, it is possible to produce multiple random bit sequences at the same time. In this paper, a scheme for obtaining high quality chaotic signals from a ring system based on three unidirectional polarization rotation coupling 1550 nm-VCSELs is proposed. Based on the spin inversion model, the nonlinear dynamic characteristics of the output signals of three laser polarization components in the system are studied theoretically. The autocorrelation and mutual information methods are used to analyze the TDS, of each polarization component output time series and the correlation characteristics between the polarization components are discussed by using the cross-correlation function. The results show that the six polarization components of three 1550 nm-VCSELs can exist at the same time by adjusting the injection intensity and frequency detuning between the lasers by polarization rotation coupling, and the output power of each polarization component is equal. In the system, the injection intensity and frequency detuning of the unidirectional polarization rotation coupling have a significant effect on the TDS of the six-channel signal output by the system. In the case of fixed injection intensity or frequency detuning, the TDS peak of each polarization component output signal can be restrained below 0.2 by adjusting other system parameters. By synthetically analyzing the influence of the combination of injection intensity and frequency detuning on the output signal TDS of the system, the precise range of coupling parameters of the TDS which can effectively suppress the chaotic signals is determined. By further optimizing the parameter range of the system, it can be ensured that there is a strong correlation between the two polarization components of only one VCSEL output signal in the six-channel output signal, but the correlation between the output signals of different VCSELs polarization components is weaker. Therefore, the system can output six chaotic signals effectively suppressed by TDS at the same time, and the correlation of three chaotic signals is weak.
【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】：2017
【分類號(hào)】：TN248

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