博碩士論文 88226012 詳細資訊


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 第一章
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第二章
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第三章
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第四章
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[4.6] K. I. Suzuki, H. Masuda, S. Kawai, K. Aida, and J. Conradi, “Bidirectional 10-channel 2.5 Gbit/s WDM transmission over 250 km using 76 nm (1531-1607 nm) gain-band bidirectional erbium-doped fiber amplifiers,” Electron. Lett. 33 (1997) , 1967-1968.
[4.7] “The large effective area advantage: for multi-window applications,” Corning Corporation Tech. Report, 2000.
[4.8] H. H. Lu, H. L. Ma, and C. T. Lee,”Bidirectional transport of AM-VSB CATV system”; J. Opt. Commun. 23 (2002) 1, 22-25.
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第五章
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[5.6] S. Ovadia, H. Dai, C. Lin, and W. T. Anderson: “Performance of hybrid multichannel AM/256-QAM video lightwave transmission systems”; IEEE Photon. Technol. Lett. 7 (1995) 11, 1351-1353.
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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