嶄新正交分頻多址混合式接取網路架構整合寬頻和無線傳輸服務

Abstract

現今，各式各樣新興的網路服務使得消費者對網路頻寬的需求遽增。如今以銅為傳輸媒介的DSL技術已無法提供足夠的頻寬，而光接取技術是一個明顯的解決方案，因為光纖能提供相當高的頻寬。無線服務所提供的機動性是另一項重要的需求，我們的目標就是結合有線和無線傳輸來建立一個高成本效益的系統。正交分頻多址被動式光纖網路是此一新興系統，它擁有高頻寬使用效率和易於整合有線及無線傳輸等優點，但迄今已被提出的系統都需要配合使用WDM雷射，這非但提高系統成本也使得系統有光拍差雜訊的問題。因此，我們提出一個嶄新的正交分頻多址被動式光纖網路架構，此架構無須使用到WDM雷射，它更兼具成本效益和頻寬使用效率。此外，我們提出了三種方式去改善寬頻訊號和無線訊號間的相互干擾，我將會詳細的分析這三種方法。其中我們以一系列的實驗來驗證此系統的可行性。

Today, a variety of new network services make users’ demands for bandwidth grow dramatically. The DSL technology based on copper cannot provide enough bandwidth. Optical network is the solution, because fiber can provide very high bandwidth. The mobility of wireless service is another primary demand. Thus, our goal is to integrate wireline and wireless service to build a cost-effective system. The OFDMA PON is this new system which has high spectral efficiency and it can integrate wireline and wireless service. But the OFDMA system which has been proposed so far needs to be operated with the WDM laser. The process not only increases the cost of system and but also leads to the OBI problem. So, we propose a novel architecture of OFDMA PON which can go without WDM laser. It is cost-effective and bandwidth-effective. In addition, we propose three methods to improve the interference between broadband signal as well as wireless signal. And I will analyze these three methods in details below. And we carry out a series of experiments to demonstrate the feasibility of the system.