雙向混合DWDM系統架構在80-km LEAF上傳送CATV和OC-48信號

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姓名

馬先禮(Hsien-Li Ma) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

雙向混合DWDM系統架構在80-km LEAF上傳送CATV和OC-48信號
(A Bidirectional Hybrid DWDM System for CATV and OC-48 Trunking)

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摘要(中)

本論文中，主要研究方向在於利用雙向傳輸及高密度分波多工 (DWDM) 技術，所架構而成的外調式光纖有線電視 (CATV) 長距離傳輸系統，不僅系統傳輸容量倍增，而且測得相當優異的電視系統性能參數。首先，將此系統架構的傳輸媒介用標準單模光纖 (SMF)、TWF及大有效截面積光纖 (LEAF) 相互作比較，當光信號經80公里大有效截面積光纖傳送後，於信號接收端由解多工器分出並測得良好的系統參數特性:載波雜訊比(CNR≧50 dB)、載波二次合成拍差比(CSO≧68 dB)和載波三次合成拍差比(CTB≧64 dB)。
接著我們研究利用四個不同波長的高密度分波多工系統，架構在 4公里多模光纖 (MMF) 上傳送256-QAM數位信號。首先利用多頻道信號產生器，產生252個未經調變的射頻信號源，透過這4公里多模光纖的高密度分波多工系統搭配次載波技術傳送256-QAM數位信號，此系統其傳輸容量可達到10 Gbit/s。若將其應用在Gigabit Ethernet 中，因其具有高速資料傳遞的優點，所以在網路快速需求發展的環境裡，想必會非常引人注目。
再則進一步以四個不同波長建構雙向混合高密度分波多工系統，用來作為有線電視和OC-48信號的傳輸中繼，其中兩個波長傳送有線電視類比信號，另外兩個波長則用來傳送數位基頻信號。不僅系統傳輸容量倍增，而且在經由 80公里大有效截面積光纖傳送後，結果可知傳送數位信號並未造成任何通信品質的劣化，且在接收端測得相當優異的系統參數特性:載波雜訊比≧50 dB、載波二次合成拍差比≧65 dB、載波三次合成拍差比≧63 dB和很低的數位信號誤碼率。
最後，利用雙向光纖有線電視網路系統的架構 : 下行頻段:50 ~ 750 MHz、上行頻段:5 ~ 42 MHz。若利用此有線電視分佈網路作為網際網路(Internet) 的接取，則由實驗結果可顯示出，上行雜訊的累積與時間相關，這是網路系統設計者不可控制的因素。然而可更進一步研究得知，並不是所有上行頻率 (5 ~ 42 MHz) 均可用作雙向通訊服務，僅在 25 MHz頻段以上是比較適合用在雙向服務。

摘要(英)

Abort

關鍵字(中)

★ 大有效截面積光纖
★ 載波三次合成拍差比
★ 載波二次合成拍差比
★ 載波雜訊比
★ 高密度分波多工器
★ 次載波多工
★ 調幅殘波帶調變

關鍵字(英)

★ AM-VSB
★ SCM
★ LEAF
★ CTB
★ CSO
★ CNR
★ DWDM

論文目次

論文摘要.......................................................I
目錄...........................................................IV
圖表索引.......................................................VI
第一章前言..................................................1
第二章有線電視雙向傳輸系統.....................................9
2-1 導論.................................................9
2-2 實驗架構.............................................10
2-3 實驗結果及討論.......................................13
2-4 結論.................................................18
第三章高密度分波多工系統搭配次載波多工技術架構在4公里多模光纖上傳送256-QAM信
號.......................................................19
3-1 導論.................................................19
3-2 實驗架構.............................................20
3-3 實驗結果和討論.......................................22
3-4 結論.................................................24
第四章雙向混合高密度分波多工系統架構在80公里大有效截面積光纖上傳送CATV和
OC-48信號...............................................25
4-1 導論.................................................25
4-2 實驗架構.............................................27
4-3 實驗結果及討論.......................................29
4-4 結論.................................................32
第五章以光纖有線電視網路同時傳送有線電視與網際網路信號.........34
5-1 導論.................................................34
5-2 上行入侵雜訊的分析...................................35
5-3 實驗架構.............................................37
5-4 實驗結果及討論.......................................38
5-5 結論.................................................40
第六章結論...................................................42
參考文獻.......................................................66
著作...........................................................73

參考文獻

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第五章
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指導教授

呂海涵、李清庭
(Hai-Han Lu、Ching-Ting Lee)

審核日期

2002-7-11

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