【摘要】：微波頻率梳(MFCs)因可同時提供多頻微波信號而在雷達探測、寬帶無線通信等領域有著巨大的應用前景。傳統(tǒng)的基于電學方式的微波頻率梳產(chǎn)生方案雖能獲得帶寬達幾個GHz甚至十幾GHz的微波頻率梳信號,但由于這種頻率梳梳距不能靈活調(diào)節(jié)而使其應用受到了限制。另外,受電子頻頸的限制,這種電子電路產(chǎn)生方案很難向更高帶寬擴展。近年來,基于光學方式產(chǎn)生微波頻率梳的方案受到了廣泛關注。目前,基于非相干光反饋半導體激光器(SL)獲取微波頻率梳的研究還未見報道。就非相干光反饋系統(tǒng)而言,由于非相干光反饋只作用于載流子而不作用于光場,因而具有對反饋光相位變化不敏感的特征。另一方面,非相干光反饋系統(tǒng)屬全光系統(tǒng),不受電子器件帶寬的限制,能滿足超寬帶微波頻率梳產(chǎn)生的要求。基于此,本文提出了一種基于非相干光反饋半導體激光器產(chǎn)生可調(diào)諧超寬帶微波頻率梳的新型全光系統(tǒng),并對該系統(tǒng)所產(chǎn)生的微波頻率梳特征進行了理論分析和數(shù)值仿真研究。研究結果表明：在合適的參數(shù)條件下,非相干光反饋半導體激光器能工作在規(guī)則脈沖(RP)態(tài),并且在10dB幅值變化范圍內(nèi),能產(chǎn)生帶寬超過40GHz的微波頻率梳。對于一個固定注入電流,微波頻率梳的梳距(重復頻率)可以通過改變反饋延遲時間和反饋強度而調(diào)諧,且調(diào)諧范圍隨著注入電流的增加而增加。微波頻率梳的線寬對反饋延遲時間和反饋強度的變化比較敏感,通過精細調(diào)諧反饋延遲時間和反饋強度可以得到低至幾十KHz的線寬。另外,本文給出了微波頻率梳的幅值變化、重復頻率和線寬在反饋延遲時間和反饋強度構成的參數(shù)空間的分布圖。
[Abstract]:Microwave frequency comb (MFCs) has great application prospect in radar detection, broadband wireless communication and so on because it can simultaneously provide multi-frequency microwave signal. The traditional microwave frequency comb generation scheme based on electrical mode can obtain microwave frequency comb signal with bandwidth up to several GHz or even more than ten GHz, but its application is limited because the frequency comb distance can not be adjusted flexibly. In addition, due to the limitation of electronic frequency neck, this electronic circuit generation scheme is difficult to extend to higher bandwidth. In recent years, microwave frequency comb generation based on optical mode has received wide attention. At present, the study of obtaining microwave frequency comb based on incoherent optical feedback semiconductor laser (SL) has not been reported. As far as incoherent optical feedback system is concerned, incoherent optical feedback is insensitive to the phase change of feedback light because it acts only on carriers and does not act on light field. On the other hand, the incoherent optical feedback system is an all-optical system, which is not limited by the bandwidth of electronic devices and can meet the requirements of ultra-wideband microwave frequency comb generation. Based on this, a novel all-optical system based on incoherent optical feedback semiconductor laser to generate tunable ultra-wideband microwave frequency comb is proposed. The characteristics of microwave frequency comb generated by the system are theoretically analyzed and numerically simulated. The results show that the incoherent optical feedback semiconductor laser can work in the regular pulse (RP) state under suitable parameters, and in the range of 10dB amplitude, the microwave frequency comb with bandwidth exceeding 40GHz can be generated. For a fixed injection current, the comb distance (repetition rate) of the microwave frequency comb can be tuned by changing the feedback delay time and the feedback intensity, and the tuning range increases with the increase of the injection current. The linewidth of microwave frequency comb is sensitive to the variation of feedback delay time and feedback intensity. By fine tuning feedback delay time and feedback intensity, the linewidth of as low as dozens of KHz can be obtained. In addition, the amplitude variation, repetition rate and linewidth of microwave frequency comb in the parameter space of feedback delay time and feedback intensity are given.
【學位授予單位】：西南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248.4

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