摘要
本論文的主旨在研究光纖微波(ROF)傳輸系統之應用。光纖微波(ROF)於光波傳輸系統中之所以被選擇應用，是由於光纖能夠提供更大的傳輸容量與低的傳輸損失等優點，這使得傳輸距離可以大大的被延伸，光纖網路更具彈性使用及更確保光纖網路的安全及穩定性。 本論文第一個架構，運用一個直接檢測雙向高密度分波多工(DWDM)微波傳輸系統來建立於區域網路(LAN)和智慧型網路傳輸系統(ITS)的應用。通過這種方式在檢測前由於光載波和邊帶的光纖色散所導致的RF功率衰減，可藉由此架構來消除。在50公里單模光纖(SMF)傳輸上，有良好的誤碼率(BER)表並實現我們提出的系統。提出的雙向微波高密度分波多工傳輸系統是適用於微波光纖網路的。 由於長距離的傳輸是未來的趨勢，在長距離所產生的二階與三階諧波失真是首要克服並解決的問題，本論文第二個架構，這系統提出並成功實驗了非線性失真抑制架構是可行的。在一個外部調變10 GHz/70 Mbps的數據速率（相容WiMAX的格式）的信號和傳輸超過120公里的單模光纖(SMF)同時傳輸下/上行鏈路所量測的結果取得了良好的誤碼率(BER)性能和清晰的眼圖。提出這樣架構的全雙工ROF傳輸系統是適合長途微波光纖鏈路。 在經濟成本的考量上，如何使用低頻率的元件來完成高頻率的架構是長期研究的目標之一，本論文最後一個架構，結合一個經濟的多波段光載波產生器和增強光訊號雜訊比(OSNR)的一種新的光信號，提出並證明用於光纖微波(ROF)傳輸系統是可行的。藉由適當的載波波段選擇可以得到所提出的架構。此外，所提出的架構也呈現很高的可能性來達到60 GHz光纖微波(ROF)傳輸系統藉由一個10GHz的本地震盪器(LO)和一個雷射二極體(LD)及一個低頻的外部調變器。
並列摘要
In this dissertation, we investigate and present radio-over-fiber (ROF) transport systems. Radio-over-fiber (ROF) light-wave transmission systems, the reason why was chosen application, is due to the optical fiber to provide greater transmission capacity and low transmission loss, which makes the transmission distance can be extended greatly, fiber-optic network more flexible and ensure to security and stability of fiber-optic network. Firstly, a bidirectional radio-on-dense-wavelength-division-multiplexing (DWDM) transport system for local area network (LAN) (11Mbps/2.4GHz) and intelligence transport system (ITS) (20Mbps/5.8 GHz) applications based on direct-detection scheme is proposed and demonstrated. By this way, the RF power degradation introduced by fiber dispersion can be avoided since optical carrier and one of the sidebands are eliminated before detecting. Over a-50 km single-mode fiber (SMF) transmission, good bit error rate (BER) performances (〖10〗^(-9)) were achieved in our proposed systems. Such proposed bidirectional radio-on-DWDM transport systems are suitable for microwave optical links. Secondly, a full-duplex radio-over-fiber (ROF) transport system employing a broadband amplified spontaneous emission (ASE) light source and nonlinear distortion suppression scheme is proposed and demonstrated. A 10 GHz/70 Mbps data rate (compatible WiMAX format) signal is externally modulated and transmitted over a 120 km single-mode fiber (SMF) transmission both for down/up-link. Good bit error rate (BER) performance and a clear eye diagram were achieved in our proposed systems. Such a proposed full-duplex ROF transport system is suitable for long-haul microwave optical links. Finally, a combination of an economic multi-band optical carrier generator and a novel optical signal to noise ratio (OSNR) enhancement circuit is proposed and demonstrated for radio over fiber (ROF) transport systems. Clear eye diagram and error free transmission reveal that with a proper carrier selector the proposed scheme can be obtained. Furthermore, this proposal also presents a high possibility to achieve 60 GHz ROF transmissions by a 10 GHz LO, a LD and a low frequency external modulator.
參考文獻
延伸閱讀
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