【摘要】：基于外部擾動(dòng)下半導(dǎo)體激光器輸出的混沌信號(hào)因在混沌保密通信、高速隨機(jī)數(shù)獲取、混沌雷達(dá)等方面巨大的應(yīng)用價(jià)值而受到越來(lái)越多的關(guān)注。在眾多的混沌激光產(chǎn)生方式中,光反饋半導(dǎo)體激光器因具有結(jié)構(gòu)簡(jiǎn)單、容易操作、容易獲得高維混沌激光等優(yōu)點(diǎn)而備受歡迎。然而,光反饋半導(dǎo)體激光器輸出的混沌信號(hào)中不可避免的具有時(shí)延特征,從而極大的阻礙了光反饋半導(dǎo)體激光器在相關(guān)領(lǐng)域的應(yīng)用,如降低保密通信系統(tǒng)的安全性、降低隨機(jī)數(shù)的統(tǒng)計(jì)性能、降低混沌雷達(dá)的測(cè)量精度精度。因此,研究光反饋半導(dǎo)體激光器混沌輸出的延時(shí)特征抑制的相關(guān)理論和技術(shù)具有重要的現(xiàn)實(shí)意義。通常,光反饋半導(dǎo)體激光器的外腔大多采用平面鏡,研究表明利用諸如法布里-珀羅干涉儀或光纖布拉格光柵這樣的具有色散特性的濾波器來(lái)替代平面鏡,可以更好的抑制系統(tǒng)輸出延時(shí)特征的效果�；诖�,本文利用兩個(gè)法布里-珀羅干涉儀替代雙光反饋半導(dǎo)體激光器中的平面鏡,構(gòu)成雙濾波反饋半導(dǎo)體激光器系統(tǒng),并理論分析了反饋強(qiáng)度、反饋時(shí)間、濾波器帶寬和半導(dǎo)體激光器中心頻率和濾波器中心頻率的頻率失諧等參量對(duì)系統(tǒng)輸出混沌信號(hào)的延時(shí)特征的影響。研究結(jié)果表明:當(dāng)雙濾波反饋系統(tǒng)的反饋時(shí)間大致為半導(dǎo)體激光器弛豫振蕩周期的二分之一的時(shí)候,激光器輸出混沌信號(hào)的時(shí)延特征可能被很好的抑制;對(duì)于2?為2.92ns和3.08ns的情況,通過(guò)適當(dāng)選取兩個(gè)反饋腔的反饋強(qiáng)度,系統(tǒng)混沌輸出延時(shí)特征的抑制效果可以得到進(jìn)一步提高。此外,通過(guò)分析濾波器帶寬以及半導(dǎo)體激光器中心頻率對(duì)濾波器中心頻率的失諧對(duì)延時(shí)特征抑制的影響,為了確定取得滿意的低延時(shí)特征混沌信號(hào)需要的反饋參數(shù)的范圍,在頻率失諧與濾波帶寬構(gòu)成的參數(shù)空間繪制了延時(shí)特征的分布圖。
[Abstract]:The chaotic signal output from semiconductor laser based on external disturbance has attracted more and more attention because of its great application value in chaotic secure communication, high-speed random number acquisition, chaotic radar and so on. Among the many chaotic laser generation methods, optical feedback semiconductor lasers are popular because of their simple structure, easy operation and easy access to high-dimensional chaotic lasers. However, the chaotic signal output by optical feedback semiconductor laser inevitably has the characteristic of delay, which greatly hinders the application of optical feedback semiconductor laser in related fields, such as reducing the security of secure communication system. The statistical performance of random numbers is reduced and the measurement accuracy of chaotic radar is reduced. Therefore, it is of great practical significance to study the delay characteristic suppression of optical feedback semiconductor lasers. Generally speaking, the external cavity of optical feedback semiconductor laser is mostly planar mirror. It has been shown that a dispersive filter such as Fabry-Perot interferometer or fiber Bragg grating is used to replace the planar mirror. Can better suppress the system output delay characteristics of the effect. Based on this, this paper uses two Fabry-Perot interferometers to replace the planar mirror in the double-optical feedback semiconductor laser, and constructs a double-filter feedback semiconductor laser system. The feedback intensity and feedback time are analyzed theoretically. The effects of the filter bandwidth and the frequency detuning of the semiconductor laser and the central frequency of the filter on the delay characteristics of the chaotic signal output from the system. The results show that when the feedback time of the double filter feedback system is approximately 1/2 of the relaxation oscillation period of the semiconductor laser, the delay characteristics of the laser output chaotic signal may be well suppressed. In the case of 2.92ns and 3.08ns, the suppression effect of chaotic output delay characteristics can be further improved by properly selecting the feedback intensity of two feedback cavities. In addition, by analyzing the influence of filter bandwidth and central frequency of semiconductor laser on delay characteristic suppression, the range of feedback parameters needed to obtain satisfactory chaotic signals with low delay characteristics is determined. The distribution of delay characteristics is plotted in the parameter space of frequency detuning and filter bandwidth.
【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)】：TN248.4

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