【摘要】：基于外部擾動下半導體激光器輸出的混沌信號因在混沌保密通信、高速隨機數(shù)獲取、混沌雷達等方面巨大的應用價值而受到越來越多的關注。在眾多的混沌激光產(chǎn)生方式中,光反饋半導體激光器因具有結構簡單、容易操作、容易獲得高維混沌激光等優(yōu)點而備受歡迎。然而,光反饋半導體激光器輸出的混沌信號中不可避免的具有時延特征,從而極大的阻礙了光反饋半導體激光器在相關領域的應用,如降低保密通信系統(tǒng)的安全性、降低隨機數(shù)的統(tǒng)計性能、降低混沌雷達的測量精度精度。因此,研究光反饋半導體激光器混沌輸出的延時特征抑制的相關理論和技術具有重要的現(xiàn)實意義。通常,光反饋半導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替代平面鏡,可以更好的抑制系統(tǒng)輸出延時特征的效果�；诖�,本文利用兩個法布里-珀羅干涉儀替代雙光反饋半導體激光器中的平面鏡,構成雙濾波反饋半導體激光器系統(tǒng),并理論分析了反饋強度、反饋時間、濾波器帶寬和半導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系統(tǒng)輸出混沌信號的延時特征的影響。研究結果表明:當雙濾波反饋系統(tǒng)的反饋時間大致為半導體激光器弛豫振蕩周期的二分之一的時候,激光器輸出混沌信號的時延特征可能被很好的抑制;對于2?為2.92ns和3.08ns的情況,通過適當選取兩個反饋腔的反饋強度,系統(tǒng)混沌輸出延時特征的抑制效果可以得到進一步提高。此外,通過分析濾波器帶寬以及半導體激光器中心頻率對濾波器中心頻率的失諧對延時特征抑制的影響,為了確定取得滿意的低延時特征混沌信號需要的反饋參數(shù)的范圍,在頻率失諧與濾波帶寬構成的參數(shù)空間繪制了延時特征的分布圖。
[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.
【學位授予單位】：西南大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN248.4

【參考文獻】

相關期刊論文 前10條

1 周立;夏光瓊;鐘祝強;吳加貴;王順天;吳正茂;;Time-delay signature concealment of polarizationresolved chaos outputs in vertical-cavity surface-emitting lasers with variable-polarization filtered optical feedback[J];Chinese Optics Letters;2015年09期

2 胡漢平;陳笑風;蘇威;謝飛龍;高孝婧;;基于光電反饋延遲的多點耦合混沌同步和通信[J];光學學報;2014年04期

3 劉慧杰;馮久超;任斌;;開環(huán)全光混沌通信系統(tǒng)中的光纖信道結構[J];光子學報;2012年11期

4 劉玉金;張勝海;楊華;譚建鋒;;光反饋垂直腔面發(fā)射半導體激光器的混沌驅動同步在保密通信中的應用[J];中國激光;2012年09期

5 郭園園;武媛;王云才;;Method to identify time delay of chaotic semiconductor laser with optical feedback[J];Chinese Optics Letters;2012年06期

6 顏森林;;激光混沌耦合反饋光電及全光邏輯門研究[J];物理學報;2011年05期

7 譚建鋒;張勝海;王偉;趙振華;;延遲光反饋VCSEL的混沌動力學特性[J];光子學報;2011年02期

8 顏森林;;交叉相位調制提高半導體激光器混沌載波發(fā)射機帶寬方法[J];物理學報;2010年06期

9 顏森林;;光纖環(huán)形外腔延時光反饋自相位調制提高半導體激光器混沌載波發(fā)射機帶寬方法研究[J];科學通報;2010年06期

10 郭東明;楊玲珍;王安幫;張秀娟;王云才;;反饋強度調制增強混沌光通信的保密性[J];物理學報;2009年12期

，

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