為了達到高容量長距離傳輸並且保持峰均功率比 (Peak-to-Average Power Ratio, PAPR)較低的情況下，我們使用具備較高頻譜使用效率並且峰均功率較低的無載波幅相調變 (Carrier-Less Amplitude-Phase Modulation, CAP)訊號。在為了達到傳輸系統低成本的需求下使用了強度調變直接偵測 (Intensity Modulation / Direct Detection, IM / DD)系統。然而，不管是以直接調變DFB雷射 (Direct Modulated DFB Laser, DML)或是電致吸收調變雷射 (Electro-Absorption Modulated Laser, EML)為主的系統傳輸訊號皆為雙邊帶訊號 (Double Sideband Signal)，而雙邊帶訊號在經過長距離傳輸後會有功率衰減 (Power Fading)的問題存在，我們使用光學單邊帶訊號來解決此問題。
相較於本實驗室曾經提出的使用正交分頻多工訊號 (Orthogonal Frequency Division Multiplexing, OFDM)單邊帶，本篇論文中我們提出了一個無載波幅相調變單邊帶調變方法，在同樣使用串聯直接調變DFB雷射與電致吸收調變器 (Electro-Absorption Modulator, EAM)產生單邊帶訊號下，不但能夠解決功率衰減的問題，還有峰均功率比較低的優勢。在傳輸250 km後，不需經過二階伏爾泰拉濾波器解調前，傳輸速度就能達到12 Gbps，在經過二階伏爾泰拉濾波器解調後傳輸速度便能上升至16 Gbps。

To achieve high-capacity cost-effective transmission and keep lower PAPR, this work used spectrally efficient Carrier-Less Amplitude Phase Modulation (CAP) signals in an Intensity Modulation / Direct Detection (IM/DD) system. However, either based on Direct Modulated DFB Laser (DML) or Electro-Absorption Modulated Laser (EML), the generated optical signals are intrinsically double sideband, and that would cause power fading after dispersive transmission. In this work , we proposed optical single-sideband CAP modulation to combat with power fading in an IM/DD long-reach transmission system.
The single-sideband CAP modulation was realized in this work by a cascaded DML/EAM. Using single-sideband CAP not only can achieve power fading free but also has the lower PAPR, as compared with single-sideband OFDM signals. This work can achieve bit rates of 12 and 16 Gbps after transmission over 250 km without and being compensating by second-order Volterra Filter, respectively.

論文審定書 i
致謝 ii
中文摘要 iii
Abstract iv
目錄 v
圖次 vii
第一章 緒論 1
1-1前言 1
1-2研究動機 2
第二章 強度調變直接偵測系統 4
2-1正交分頻多工 4
2-1-1正交分頻多工簡介 4
2-1-2 正交分頻多工之原理 4
2-1-3 正交分頻多工的優缺點 5
2-2 無載波幅相調變 8
2-2-1 無載波幅相調變簡介 8
2-2-2 無載波幅相調變之原理 8
2-2-3 無載波幅相調變的優缺點 9
2-2-4 前饋式等化器 10
2-2-5 決策反饋式等化器 11
2-2-6 伏爾泰拉濾波器 12
2-3 強度調變直接偵測 13
2-3-1 強度調變直接偵測簡介 13
2-3-2 電致吸收調變器 14
2-3-3 直接調變DFB雷射 15
2-4 光纖傳輸系統 17
2-4-1 光纖傳輸系統簡介 17
2-4-2 色散 18
2-4-3 啁啾 19
2-4-4 功率衰減 19
第三章 單邊帶訊號 22
3-1單邊帶訊號原理 22
3-2單邊帶訊號調變 23
第四章 實驗架構與結果 26
4-1實驗架構 26
4-1-1實驗設備 26
4-1-2單邊帶調變 28
4-2實驗結果與討論 29
4-2-1無載波幅相調變單邊帶滾降係數 29
4-2-2無載波幅相調變單邊帶與雙邊帶比較 33
4-2-3相位噪聲對單邊帶系統的影響 43
4-2-4無載波幅相調變與正交分頻多工單邊帶比較 44
4-2-5單邊帶數位濾波器長度比較 45
第五章 結論 48
參考文獻 49

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