本論文研究利用雙光注入一增益調製 Fabry-P\'erot半導體雷射產生可用於隨機調製脈衝光達應用之隨機開關脈衝光源訊號。透過將一道主雷射光(ML1)注入增益調製副雷射(SL)之一個共振模並操作在其雙穩態，經由增益競爭效應 (gain-competition)副雷射之中心模將可產生隨機開關調製之光脈衝。透過注入第二道主雷射光(ML2)於副雷射之中心模中，輸出脈衝訊號的穩定性及強度可大幅增加以適用於閥值偵測及時域相關單光計數(time-correlated single photon counting)等技術。於此論文中，我們研究不同注入參數下的雷射動態行為，並找出雙穩態的操作調件。在不需任何數位電路及外部光電調製器的架構下，我們成功透過雙光注入產生隨機開關調製脈衝訊號。我們分析訊雜比(signal-to-noise ratio)與成功偵測率(detection probability)，驗證所產生之脈衝訊號適合用於隨機調製脈衝光達應用，並具有無偵測距離模糊(no range ambiguity)及抗干擾(anti-interference)之特點。在主雷射注入強度分別為0.418及0.038、互相關長度90~${\mu}$s的條件下，即使遭受高達49組類似之隨機脈衝訊號干擾，我們驗證本架構仍能保持成功偵測率為1之優異表現。

We study the generation of random on-off modulation pulses by optically injecting a gain-switched Fabry-P{\'e}rot semiconductor laser with a dual-mode injection for random-modulation pulsed lidar applications. In the dual-mode injection scheme proposed, the first master laser (ML1) injecting on the resonant sidemode of the gain-switched slave laser (SL) randomly locks the injected sidemode and suppresses the output pulses in the center mode through gain-competition. The second master laser (ML2) injecting on the center mode then stabilizes and enhances the output pulses to have equal amplitudes suitable for digital threshold detection and time-correlated single photon counting. Under different injection conditions, we identify dynamical states including unlocked, stable locking, bistable, and instability. By operating the laser in the bistable states randomly switching between the unlocked and stable locking states, we successfully generate random on-off modulation pulses without employing any digital circuits or external modulators. We analyze the signal-to-noise ratio (SNR) and detection probability of the proposed scheme to show its feasibility in random-modulation pulsed lidar applications. Moreover, we study its anti-interference capability by adding interference from additional channels with similar modulated pulses. We show that, with injection strengths of 0.418 and 0.038 from the ML1 and ML2 and a correlation length $T_{\rm{c}}=90~\mu$s, a detection probability of 1 can be readily achieved even under the interference from more than 49 additional channels.

致謝 I
中文摘要 II
Abstract III
Contents IV
List of Figures VI

1 Introduction
1.1 Overview....................................1
1.2 Background of Dynamical States in Semiconductor Lasers . . . . . . . .4
1.3 Outline of Thesis ...............................6

2 Generation of Random On-Off Modulation Pulses
2.1 ExperimentalSetup.............................. 7
2.2 Characterization of Random On-Off Modulation Pulses . . . . . . . . . .9

3 Performance Analyses of Random On-Off Modulation Pulses for Random- Modulation Pulsed Lidar Applications

3.1 ExperimentalSetup.............................. 17
3.2 InfluenceofInjectionStrength........................ 19
3.3 Signal-to-Noise Ratio and Detection Probability . . . . . . . . . . . . . . 21
3.3.1 InfluenceofSignalDegradation ................... 26
3.3.2 InfluenceofMulti-ChannelInterference . . . . . . . . . . . . . . . 27
3.4 StabilityoftheCross-CorrelationTrace................... 30

4 Conclusion
4.1 Summary ................................... 33
4.2 Future Research................................ 35

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