本論文探討在有線電視光纖同軸混和網路基礎上建構新一代FTTx光纖寬頻網路的可行性。有線電視的光纖同軸混和網路使用光纖直達光節點，通常每個光節點設計六芯光纖，涵蓋500-2,000住戶，其密集的光節點架構適合設計乙太光纖都會網路(Optical Ethernet Metropolitan Access Network, Optical Ether-MAN) 及被動光纖網路(Passive Optical Network, PON)等新一代光纖寬頻網路。
　
　　首先本文提出延伸光節點光纖進入商業大樓，架設乙太交換機，提供Ether-MAN服務的規劃方式。同時藉由VLAN堆疊及MAC堆疊技術突破乙太網路4096個VLAN的限制，再以新的自動備援切換技術如RPR或EAPS提供電信服務等級的50ms備援切換，最後再使用CWDM分波多工技術提供頻寬及電路的擴充。
　
　　其次探討在有線電視網路上提供PON網路服務的設計方式，並提出經濟有效且簡單易行的網路升級流程。首先由光節點以光分歧器分配光訊號提供GEPON服務，再加入CWDM多工/解多工系統，提供CWDM-GEPON的網路擴充升級，最後再以DWDM多工/解多工系統，配合使用具自動選擇波長的光傳輸設備，進一步升級為DWDM-PON系統。
　
　　本論文提出循序漸進的網路升級方式，讓有線電視網路在原有基礎上逐步擴充，建設一個配合未來服務需求的新一代光纖寬頻網路。

　This thesis investigates the feasibilities about building various next generation FTTx infrastructures which based on the CATV hybrid fiber-coax (HFC) network using the PON and Gigabit Ethernet technologies. The CATV HFC network has its inherent advantage of dense fiber coverage with commonly six fiber counts into a fiber node which usually cover 500-2,000 homepass. This dense optical nodes structure fits the designs of optical Ethernet metropolitan access network and passive optical network to provide FTTx broadband service.
　
　First, we propose the Ether-MAN architecture by extending optical node fibers to commercial buildings. The limitation of 4,096 VLAN tags can be broken by Q-in-Q and MAC-in-MAC technologies. The auto protect switching mechanisms (RPR, EAPS etc.) are used to provide the telecom-grade restoration in 50ms. The bandwidth capacity of this kind of network is greatly upgraded by the implementation of WDM.
　
　Secondly, we propose the design of PON network with smooth and economical upgraded procedures. The GEPON service is provided through optical splitters located at remote nodes. Therefore GEPON can be upgraded to CWDM-PON by adding CWDM multiplexers at remote node. Finally, DWDM multiplexers (AWG) and colourless ONUs are used to upgrade CWDM-PON to DWDM-PON systems.
　
　This thesis proposes a systematic and reasonable approach to build next generation FTTx network which matches all the service need of the future.

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