由於新的應用技術廣泛實行於網際網路，例如網際協議通話技術及網路協定電視等，使得使用者對於高頻寬的需求與日俱增。多重協定標籤交換在區域網路已經引起相當大的關注。MPLS是一種整合了標籤交換架構與網路層路由機制的技術，最基本的概念是將進入MPLS網路的封包配置一個固定長度的標籤，在MPLS網路中，封包根據標籤做傳送，由標籤來決定封包在網路上的路徑。在MPLS裡，封包在網路層的分析僅進行一次，接著每一個封包被分配一組堆疊的標籤，標籤隨後由路由器做轉發決策時的檢查。
本篇論文提出一組光頻域複合標籤碼作為MPLS網路之無壅塞封包繞送。利用M序列碼為基底，建立以頻域振幅編碼格式之複合碼標籤。此複合標籤具有良好的正交性，並且與標籤堆疊架構相容。藉由於封包繞送節點的相關運算，對應於節點的標籤可從堆疊中辨認出來。
本篇論文將會分兩個部分分析，分別為：第一部分為對抗網路壅塞，這些複合碼標籤具有良好的編碼正交性，並與封包堆疊標籤相容，在不同的流量情形下，不同數量的標籤將被分配或重新配置到每個節點以進行傳遞。第二部分為網路安全方案，其中光網絡編碼器/解碼器（編解碼器）可重新配置標籤，以提高系統的編碼。我們採用動態可重構的頻域振幅編碼來對抗竊聽，通過改變由M序列碼處理的編碼，以防止竊聽者竊聽。

Since the implementation of new applications use in a wide range of Internet, such as Voice over Internet Protocol (VoIP) and Internet Protocol Television (IPTV), makes the user to increasing demand for high-bandwidth. Multi-protocol Label Switching (MPLS) in the LAN (local-area networks) has attracted considerable attention. MPLS is a technology that combined label switching architecture and network layer routing mechanism. The most basic concept is to configure a fixed-length labels for the packets enter the MPLS network, packet transfer according to the label, made from the label to determine the packet on the web path. In other words, the label can determine the label switching path in the network. In MPLS, the packets in the network layer only analysis once, and then each packet is assigned a set of stacked labels, then check the label forwarding decisions made by the router.
In this thesis, we construct a composite label sets for optical MPLS network. Relatively prime lengths maximal-length (M-sequence) codes are taken to compose into spectral-amplitude coding (SAC) labels. These composite M-sequence labels possess good orthogonality and are compatible with packet labels stacking. With correlation subtraction scheme in packet routing node, local node label can be identified from the stacked labels.
In this study, we will analyze the performance of two parts. Firstly, we adapt to packets traffic, these composite labels possess good coding orthogonality and are compatible with packet labels stacking. We will investigate packets routing over heavy traffic and light traffic cases on OMPLS network routing. In these extreme traffic conditions, packets arrive at the same time and in the same path, different number of labels will be allocated or reconfigured for each passing node. Secondly, we propose a network security scheme in which optical network coder/decoders (codecs) can reconfigure signature key to enhance system confidentiality for MPLS transmissions. We adopt a dynamic reconfigurable mechanism over the SAC scheme to counter eavesdropping. We compose relatively prime-length M-sequence codes into composite signature code sets that govern reconfigurable network codecs by changing signature codes to protect against eavesdropping.

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