本 論 文 研 究 重 點 為 分 佈 式 電 致 光 吸 收 調 變 器(Electroabsorption Modulator ； EAM)整合半導體光放大器(Semiconductor Optical Amplifier；SOA)之特性分析，在這次的工作中我們發現利用分佈式效應在光調變與光放大中有許多有利的優點，如有利於高速調變、較佳的微波特性、較低的雜訊係數與頻擾係數， 相當的符合光纖通訊系統的需求。
由 於 EAM 的高速、高消光比、體積小與易於積體化等優點， 已廣泛的應用在光纖通訊系統中； 然而由於EAM 波導結構形成很高的集散電容，造成微波反射過大與高頻損耗過大，在高速調變造成調變效率降低；在分佈式結構中，EAM利用高阻抗傳輸線(High impedance transmission line； HITL)整合SOA 不僅可以改善阻抗匹配更可提供光增益，且在重複放大與調變過程中可以降低SOA 自發性放射所產生的雜訊並得到較低的雜訊係數；而應用SOA 增益飽和特性更可以補償由EAM 所產生的頻擾， 在分佈式結構中也實現了此項特性。
在 本 文 中 之 工 作，我們比較分佈式EAM-SOA 與傳統單段EAM-SOA， 分佈式結構將可以改善頻寬與降低雜訊係數；在實驗上，由於分佈式效應改善阻抗匹配，-3dB 頻寬大於40GHz，因此並完成40Gbit/s 傳輸系統；且在10Gbit/s 傳輸系統中，由於分佈式元件有較低的雜訊係數，因此在誤碼率量測有較佳的3dB 靈敏度。

In this paper, a distributed Electroabsorption Modulator (EAM) monolithically integrated with Semiconductor Optical Amplifier (SOA) is analyzed. Using the distributed effects on the optical modulation and amplification, several advantages have been found in this work, such as high-speed modulation, microwave performance, low nose properties, and low chirp, which is quite fitted to the requirements of optical fiber communications.
EAMs have been widely used due to high-speed, high extinction ratio, the compactness, and the capability of integration. However, due to the highly loaded capacitance in the waveguide, EAMs generally suffer from high microwave reflection and thus low modulation efficiency during high-speed modulation. By the distributed structure, SOA-integrated EAMs can not only enhance the impedance match by adopting distributed high impedance transmission line (HITL), but also offer optical gain. By the optical processing scheme of re-amplification and re-modulation, it also has been found that the extra amplified spontaneous emission (ASE) noise coming from SOA can be reduced to get lower noise figure (NF). Appling the saturation on SOA, the positive frequency chirp of EAM can be compensated to give overall low chirp. By the distributed structure, chirp compensation has been realized by this characterization.
In this work, the distributed EAM-SOA scheme and the traditional single section EAM-SOA scheme are used for comparison, higher speed and lower NF are observed in distributed scheme. Due to impedance matching improvement in distributed scheme, a -3dB bandwidth of higher than 40GHz and 40Gbit/s data transmission is achieved, while a 15GHz of -3dB bandwidth is obtained in single device. Also, in 10Gbit/s data transmission, a 3dB lower of power penalty occurs in distributed scheme, while the lower NF is the mainly dominating mechanism.

目錄 1
致謝 3
中文摘要 4
英文摘要 5
第一章 簡介 6
第二章 微波特性 11
2.1 前言 11
2.2 微波特性分析 13
2.2.1 微波模型 13
2.2.2 微波損耗 14
2.2.3 駐波特性 15
2.2.4 頻譜響應 18
2.2.5 速度不匹配 22
2.3 實驗結果 23
第三章 雜訊特性 28
3.1 前言 28
3.2 雜訊係數分析 29
3.3 雜訊係數量測 33
3.4 誤碼率量測 35
第四章 頻擾 38
4.1 前言 38
4.2 頻擾係數與長距離光纖傳輸 38
4.3 .EAM與SOA之頻擾係數 39
4.4 頻擾係數量測 40
第五章 結論與未來工作 50
5.1 總結 50
5.2 未來工作 50
5.2.1 In-Line訊號重整應用 50
5.2.2頻擾補償長距離通訊系統 53
5.2.3雙向被動網路系統 54
第六章 參考資料與文獻 56
附錄A光放大器之Noise Figure 60
附錄B EAM-SOA之Noise Figure 64

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