標題: 分散式控制混合型被動光纖網路之光線路終端設計
Optical line terminal design for novel distributed control hybrid passive optical network
作者: 方建和
陳智弘
光電工程學系
關鍵字: 被動光纖網路;光線路終端;動態頻寬配置;PON;OLT;DBA
公開日期: 2006
摘要: 人們對頻寬的需求愈來愈大,我們最常用的非對稱數位用戶迴路已無法提供足夠的頻寬,所以愈來愈多的人開始使用光纖到家這項新的技術。光纖到家相對於非對稱數位用戶迴路來說,頻寬大了20至30倍。而在光纖到家的技術中,最常被聽見的非被動光網路莫屬了。以太被動光網路可提供的頻寬為1.25 Gbps,,這個數字遠超過數位用戶迴路所提供的頻寬。使用分時多工與分頻多工,我們會發現他們的時槽與波長的利用是沒有效率的,因為他們之中的閒置時槽與波長沒有辦法被共同使用,所以就有人提出動態頻寬配置。而以前動態頻寬配置的方式皆是由光網路單元送信號給光線路終端,然而光網路單元與光線路終端的距離都是在20公里以上,所以我們發現動態頻寬配置沒有辦法及時被更新,所以我們提出分散式的動態頻寬配置。分散式動態頻寬配置是將信號從光網路單元送至分離器即可,這大大地減少動態頻寬配置被更新的時間。而我們採用分時多工與分波多工混用是因為如果每個光網路單元都使用一個波長的話,那所耗費的成本會是相當地昂貴。而在光線路終端、光網路單元和動態頻寬配置,我們都是用現場可程式化閘陣列來完成。
More and more people require more and more bandwidth. It can not supply enough bandwidth by xDSL, so passive optical network (PON) is widespread little by little. TDM (Time Division Multiplexing) PON and WDM (Wavelength Division Multiplexing) PON are both bandwidth inefficient because the free slots and wavelength can not be shared. So someone use “Dynamic Bandwidth Control (DBA)" to solve this problem. The prevailing method of centralized control DBA is Interleaved Polling with Adaptive Cycle Time. But the distance from the ONU to the OLT is over 20 km, the round trip time is too long. The DBA can not be update immediately. So we let the calculation of DBA is near the splitter. The splitter is closer to the ONU and far from the OLT. So it can update DBA immediately. And we use mixed structure including TDM and WDM. Then we call it “Hybrid". So the name of our architecture is “Distributed Control DBA Hybrid PON".
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT009424552
http://hdl.handle.net/11536/81372
Appears in Collections:Thesis


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