WDM全光環型網路之插入式存取協定設計

Abstract

在這篇論文裡我們主要針對都會型環狀單向光纖網路提出一個適宜的MAC protocol，且此光纖網路可達成全光的目的，亦即packet從source端傳送至destination端中間的過程均以光的方式承載而不需經過光電的轉換。而我們設計這個protocol的目的是希望能達到在網路頻寬使用上的公平性以及在環狀拓樸的限制下達到最大的network throughput。 此protocol的想法主要來自於針對twin bus光纖網路所設計之ACCI protocol且此protocol之特色為具有全分散式控制的架構。關於頻寬存取的機制上當channel為idle時為隨機存取而若當channel為busy時則採取控制存取的方式。 在本論文中將會對此protocol有清楚的描述且我們亦會對我們模擬所得的結果進行分析。並且由模擬的結果我們將會證明此protocol確實可以有效克服於此單一環狀光纖網路中所可能存在的公平性議題。

In this article, we proposed a MAC protocol for an Metro all-optical WDM unidirectional ring network where packets remain in optical domain from source to destination. The main targets which have been considered in the design of this protocol consist in the achievement of a highly fair access to the network resources and a network throughput performance close to the maximum values allowed in the adopted ring topology. This protocol is based on the concepts of the ACCI protocol which is designed for a twin bus optical network and is characterized by a fully distributed control mechanism. Meanwhile, the access mechanism of proposed protocol is based on a random access if channel is idle and a controlled access if channel is busy. A detailed description of the access protocol and results of simulation will be given in the text. It will be proven that the issue of fairness arising from unidirectional optical ring network will be circumvented.