為因應被動光網路靈活、私密與存活能力(survivable capacity)的多樣性需求，以及探討分散光纖損壞的替代方式。本論文以陣列波導光柵(arrayed-waveguide grating, AWG)路由器為基礎，建置一套具備迂迴繞徑的自動隨意分享回復保護(automatic random fault-recovery)機制於光分波暨分碼多重存取(optical code-division multiple- access over WDM-PON, 本論文簡寫為WDM/OCDMA)架構。

本論文在既有無建置保護與重建(回復)保護的架構下，首要需考量：減少大規模佈建光纖的興建工程，暨避免配置過多雙重冗餘的備援設備。在此提出以AWG路由器為基礎所建置的光交換器(AWG-based optical switch)，將使得各自光網路單元群組(ONU Group)使用者之間形成具備新穎迂迴繞徑特性的虛擬star-mesh (星型-網狀)拓樸架構，當分散光纖發生錯誤時，藉由繞徑至正常運作的其他分散光纖上，而實現上、下行的回復保護能力以解決分散光纖傳輸失效的問題。

此外，本論文將探討多重存取干擾(multiple-access interference, MAI)暨相位導致振幅失真(phase-induced intensity noise, PIIN)的效應，利用這些結果及重複組合的機率概念去分析比較具備群組概念的WDM/OCDMA架構以及傳統光頻域振幅分碼多重擷取 (SAC-OCDMA) 技術的加權平均錯誤率。然而，結果顯示，在相同的錯誤率需求下，相較於傳統的未分組SAC-OCDMA，本架構能提供更多的同時使用者。此外，當有新的使用者欲加入本架構之傳輸網路，僅需藉由互連光纖(interconnection fiber) 將其連接至後端之光交換器，如此一來，即可擁有錯誤回復之保護能力。基於這些原因，相較於其他具有分散光纖保護能力之傳統分時與分波被動光網路(TDM/WDM-PON)的架構，本論文提出兼具靈活、私密性及回復機能的另一選擇性方案。

In order to realize the various flexible, confidential and survivable capacities over passive optical network (PON), and to provide alternative routing paths while distribution fiber occurs errors. A new random fault-recovery mechanism with arrayed-waveguide grating-based (AWG-based) automatic optical switches (OSWs) are proposed and configured on optical code-division multiple-access transmissions over wavelength- division multiplexing PON scheme (the abbreviation will be WDM/OCDMA in this thesis).

Under the conventional architecture without fault-recovery mechanism, the most concern is to decrease the construction processing and to prohibit too many duplicated redundant elements such as fiber/transceiver. When the transmission medium (only the distribution fiber will be discussed) occurs failures, the proposed AWG-based automatic optical switches are configured into a virtual star-mesh topology to transfer the affected ONU groups’ upstream or downstream wavebands to the others fibers which in the normal working state immediately.

Moreover, the effect of multiple-access interference (MAI) and phase-induced intensity noise (PIIN) are investigated. By using these results and the concepts of “repeated combination”, we can obtain the weighted-average bit error rate (BER) of the conventional spectral-amplitude coding OCDMA (SAC-OCDMA) and our WDM/OCDMA (i.e., grouped SAC-OCDMA). However, under the same BER requirements, the results have shown that the proposed WDM/OCMDA scheme can provide more simultaneous active users than the conventional SAC-OCDMA scheme. Furthermore, while the new ONU groups (users) joined to our WDM/OCDMA transmission network, only connected them to the corresponding port of primary AWG-based OSW via the short interconnection fibers (IFs), then they also can obtain the fault-recovery capability. For these reasons, compared with the others related researches no matter in TDM- or WDM-PON, the proposed fault-recovery mechanism provides an alternative fault-recovery solution and achieves more scalability, flexibility and confidentiality.

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