臺灣博碩士論文加值系統

此論文以數值模擬的方式探討非對稱之注入強度對於兩個相互耦合半導體雷射的效應。考慮到此系統對通訊系統的應用並希望與已發展成熟的單向耦合半導體雷射技術對應，我們著重探討週期一動態和穩定動態。首先，我們探討了此系統在各個條件下的動態演變，並且著重在動態豐富的短延遲系統做討論。此外，本研究中發現延遲時間在積體化尺度的系統，也就是極短延遲系統，其性質相似於短延遲系統在特定條件下的現象，因此首先討論短延遲系統可以更全面的討論此系統的性質。接著，關於動態的應用我們首先討論了週期一動態。探討的內容為其生成的微波頻率、微波功率以及邊代的不對稱性，以證實此系統有全光式的微波生成應用潛力。儘管相互耦合半導體雷射許多動態性質與現已高度發展的單向耦合半導體雷射技術相反，但本研究證實在特定的不對稱性是可以達到相同的優點的。最後本論文還探討了穩定態的性質，並著重在穩定輸出之頻率與其直接調製之頻率響應，證實此系統可以輸出與輸入差異極大之穩定可調輸出頻率，且也能生成較為調製帶寬大且平坦的頻率響應。

In this thesis, we present a numerical investigation of mutually injected semi-conductor lasers when the injection strength is asymmetric. For the purpose of ap-plications on communication system, the investigation focuses on period-one dy-namics and stable dynamics. First of all, the dynamics scenario of short delay sys-tem is studied to serve as a complete view of the dynamics changing. In order to study the effect on chip-scale mutually injected devices, we investigate the ul-tra-short delay system. Besides, the period-one dynamics is investigated in micro-wave fundamental frequency, sideband to carrier ratio and sideband rejection ratio and the potential of all-optical microwave generation is illustrated. Though symmet-ric mutual injection system is contract with unidirectional injection system, mutual injection systems share the same useful characteristic when proper asymmetry is presence. Finally, the stable dynamics is investigated in oscillation frequency and direct modulation response. The tunable high frequency oscillation and the condi-tions of flat frequency response is discovered.

Abstract I
List of tables IV
List of figures V
Chapter 1. Introduction 1
1.1 Background 1
1.2 Research purpose 3
1.3 Dissertation outline 6
Chapter 2. Simulation Model 7
2.1 Basic Concept of laser dynamic 7
2.1.1 Nonlinear Mechanism 8
2.1.2 Rate Equation approach 9
2.2 Model of Mutually injected semiconductor lasers 12
Chapter 3. Dynamics of Mutually Injected System 18
3.1 Dynamical behavior under symmetric injection strength 18
3.2 Dynamical maps under symmetric injection strength 24
3.3 Dynamical maps under different delay time 29
3.4 Dynamical maps under asymmetric injection strength 32
Chapter 4. Period-one dynamics of mutually injected lasers 39
4.1 Fundamental frequency of Period-one dynamic in two mutually injected lasers under asymmetric injection strength 40
4.2 Microwave power of Period-one dynamic in two mutually injected lasers under asymmetric injection strength 46
4.3 Sideband rejection ratio of Period-one dynamic in two mutually injected lasers under asymmetric injection strength 50
Chapter 5. Stable dynamics of mutually injected lasers 54
5.1 Oscillation frequency of stable dynamics in two mutually injected lasers under asymmetric injection strength 56
5.2 Frequency response of stable dynamics in two mutually injected lasers under asymmetric injection strength 59
Chapter 6. Conclusion 64
References 67

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