The Study of Optical Network Design in an Enterprise

[[abstract]]光纖網路發展已經有好幾十年的歷史，而流量也是隨著時間呈現等比級數的方式增加，企業初期建置的光纖網路便是同步數位階層(Synchronous Digital Hierarchy，SDH)。由於SDH的網管功能強大，且告警定義明確，可以使障礙分析更加準確以及快速；並且SDH設備各間公司均已經投入大量的建設，短時間內不可能加以捨棄，因此而發展出下一代同步數位階層(Next Generation Synchronous Digital Hierarchy，NG-SDH)；但是該技術僅能解決部分以語音為主的封包傳遞轉換資料封包交換為主的傳遞方式，對於高頻寬之需求仍然存在。然而隨著電子元件對於速率的限制導致速率提升受到限制，因此，對於企業光網路架構之變革就是提升網路頻寬的不二法門。本研究以此為出發點尋找可以適應SDH架構下的光網路解決方案。 本研究將分波多工（Wavelength Division Multiplexing WDM）設定為主要應用技術，進行光網路架構之變更，將SDH之架構融入WDM架構之下；並且將目前內部調查之流量需求，加入路徑規劃計算。本研究依據最短路徑演算法以及最少壅塞演算法，以量化之方式呈現出此兩種演算法於此網路架構下之優缺點。[[abstract]]The development of optical networks can be traced back over several decades and the network traffic increases rapidly over the same time Enterprise initial built Optical network is SDH (Synchronous Digital Hierarchy，SDH) Despite its powerful network management and definitive alarm classification capabilities which enabled barrier analysis to be precise and fast SDH which enterprises formerly established seems to be insufficient for the ever increasing high-bandwidth demand However it was impossible for enterprises to abandon SDH in the short term because all cases the existing SDH technology represented a significant and costly investment thus Next Generation Synchronous Digital Hierarchy (NG-SDH) was developed and introduced However and whilst NG-SDH can improve the voice-based data packet transmission partially the demand for high-bandwidth requirement is still existing Therefore improving network bandwidth is crucial for enterprise Optical Networking This thesis attempts to find a solution under an SDH-adapted framework Wavelength Division Multiplexing (WDM) is the primary application in this study and the integration of SDH into this framework The integration of an enterprise’s existing SDH technology into a WDM framework allows an enterprise to maximize the latent capacity of the fibers in their existing Optical Network whilst at the same time as safeguarding their initial investment into SDH In this respect the data for inner bandwidth request is added into wavelength path design Based on the shortest path algorithm and the least congested algorithm in this thesis advantages and disadvantages for this network architecture could be presented in a quantified wa