應用再調變技術建構全雙工光纖有線電視/微波傳輸系統

Full-Duplex Intensity-Remodulated CATV/ROF Transport Systems

李志信(Jhih-Sin Li)

指導教授 ： 呂海涵

國立臺北科技大學/電資學院/光電工程系研究所/碩士(2012年)

摘要

由於近幾年來，光纖有線電視與光纖微波傳輸被廣泛使用，其中最引起關注的技術就是有線電視與微波通訊技術的整合，因此本研究利用了再調變技術結合有線電視與微波訊號建構全雙工光纖傳輸系統。

本論文實驗架構為一個全雙工之傳輸系統，系統具備雙向雙工，下行應用相位調變載送微波訊號，上行則結合相位/強度轉換及再調變有線電視訊號。接收部分則運用單一光旁波直接檢測技術與光單邊帶接收，系統中省略精巧昂貴的RF解調元件，對於系統性能參數誤瑪率、載波雜訊比、載波二次合成拍差比、載波三次合成拍差比皆可獲得改善，有效提升系統傳輸性能及降低系統之建構成本，意味著架構簡單且具有競爭優勢。

關鍵字

光纖有線電視 ； 強度調變 ； 相位調變 ； 光纖微波

並列摘要

In recent years, cable television (CATV) and radio-over-fiber (RoF) system are used popularly. The most concerned technology is the integration of cable television (CATV) and radio-over-fiber (RoF) system, therefore, this study utilizes the re-modulation technology to integrate cable television (CATV) and radio-over-fiber (RoF) system for constructing full-duplex fiber transport system.
This paper shows a full-duplex lightwave transport system employing phase-modulated radio-over-fiber (RoF) and intensity-remodulated CATV signals in two-way transmission is proposed and experimentally demonstrated.The transmission performances of RoF and CATV signals are investigated in bidirectional ways, with the assistance of only one optical sideband and optical single sideband (SSB) schemes at the receiving sites. This system can work without expensive RF-demodulated components. Impressive transmission performances of bit error rate (BER), carrier-to-noise ratio (CNR), composite second-order (CSO), and composite triple-beat (CTB) were obtained over two 20-km single-mode fiber (SMF) links. This proposed system reveals an outstanding one with economy and convenience to be installed.

並列關鍵字

Fiber optical cable television ； intensity modulator ； phase modulator ； radio over fiber

參考文獻

[1] F. M. Mims III. “Alexander Graham Bell and the Photophone:The Centennial of the Invention of Light-Wave Communications, 1880-1980.”Opt. News 6, no. 1 1980, pp.8-16.

[3] J. C. Palais, Fiber Optic Communications, New Jersey: Upper Saddle River, Fifth Edition, pp.1-4.

[6] W. I. Way, Broadband Hybrid Fiber/Coax Access System Technologies, Academic Press, 1999, p. 34.

[7] W. I. Way, Broadband hybrid fiber/coax access system technologies, Academic Press, 1999, p. 372.

[8] X. P. Mao, R. W. Tkach, A. R, Chraplyvy, R. M. Jopson, and R. M. Derosier, “Sitmulated Brillouin threshold dependence on fiber type and uniformity,” IEEE Photon. Technol. Lett., vol. 4, 1992, pp. 66-69.