臺灣博碩士論文加值系統

在此論文中是利用數值模擬分析的方式來研究直接調變式半導體雷射遭外部光注入之頻率響應特性，內容主要是探討此雷射系統在不同的外部操作和內部本質參數下，對於頻寬、共振頻率和頻率響應曲線平坦度的影響，以探討實際可適用於光纖通訊系統的操作條件。經由光鎖定注入的方式，操作在穩定區的注入範圍條件下，較大的注入強度 和較正的頻率差值 ，最大可以觀察到40GHz以上的頻寬，比未注入的雷射系統增加了約3倍，若是同時增加正規偏壓電流值的大小，頻寬最高可以達到60GHz以上，而改變不同的內部本質參數值，頻寬也會有不同程度的增加，因此可以證明光鎖定注入方式是增加頻寬非常有效的方法。半導體雷射拿來做發射端，其輸出的頻率響應曲線越平坦，對於光纖通訊而言是越好的，在此我們探討在穩定區的注入範圍條件下，改變不同的外部操作和內部本質參數，對於曲線平坦度的影響，以利於往後實驗能掌握到最好的參數。

A numerical simulation analyses on frequency response characteristics in directly modulated semiconductor lasers subject to external optical injection is presented in this thesis. The content is bandwidth、resonance frequency and flatness of the laser system as a function of operational parameters and intrinsic parameters are investigated and discussed to explore the appropriate operating conditions for practical applications in optical fiber communications. Through the injection-locking method under stable locking area, more larger injection parameter and more positive detuning frequency difference can observe above 40GHz bandwidth, have increased about 3 times than the laser system that is not injected. If increase the bias current at the same time, bandwidth can reach above 60GHz at most. Change different intrinsic parameters, then bandwidth increase in various degrees too. So the injection-locking technique is a very effective method for bandwidth enhancement. When semiconductor laser used an emitter, frequency response curve more flatter is more fine to optical fiber communications. We change different operational and intrinsic parameters for the flatness influence of the curve, in order to get the best parameters afterwards.

中文、英文摘要...................................................................................... ii
致謝.......................................................................................................... iv
內容目錄................................................................................................... v
圖目錄......................................................................................................vii

第一章. 前言.............................................................................................1
1.1 簡介...........................................................................................1
1.2 研究動機...................................................................................5
1.3 論文架構...................................................................................6

第二章. 光鎖定注入雷射系統.................................................................7
2.1 理論模型...................................................... ............................7
2.2 模擬模型...................................................................................8

第三章. 頻寬、共振頻率和頻率響應曲線平坦度的討論...................10
3.1 頻寬、共振頻率和頻率響應曲線平坦度的簡介.................10
3.2 外部操作參數對於頻率響應特性的影響.............................12
3.2.1 注入強度和頻率差值..................................................12

3.2.2 正規偏壓電流值..........................................................20

3.3 內部本質參數對於頻率響應特性的影響…………….........30
3.3.1 線寬增強因子..............................................................30
3.3.2 差動載子衰減率..........................................................41
3.3.3 非線性載子衰減率......................................................49
3.3.4 自發性載子衰減率......................................................58

第四章. 總結...........................................................................................65
參考文獻..................................................................................................67
附錄ㄧ......................................................................................................74
附錄二......................................................................................................79

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