- 學位論文
直調分佈回授布雷格雷射與微波訊號之同調光產生及應用技術
Development of Coherence Multi-Lightwave Generation Technique Based on Directly Modulating a RF Signal with a DFB Laser Diode
摘要
在本論文中，我們展現出如何開發並利用一套新穎的多波長雷射光源來取代多顆不同波長的雷射光源於分波多工(WDM)光纖通訊系統中。不同於昂貴而又複雜的多波長光源，本論文所介紹的多波長光源僅需要一顆單縱模的分佈回授布雷格雷射（Distributed Feedback Bragg, DFB）及一台無線訊號(RF)產生器即可產生出穩定的多波長的光源。利用此技術，我們不僅可以輕易地將基頻的訊號在光領域裡升頻成無線訊號，也可利用此一光源來支持多個光纖網路。藉由此研究之成果，除了能簡化整體系統的複雜性之外，亦可以降低系統的建製成本，以達成低成本、低價格、高標準、高規格的目標。 為了詳細的記錄本研究，整個研發過程及實驗結果將分成三個部分來呈現。首先我們會探討如何利用一顆廉價的單縱模的分佈回授布雷格雷射（DFB）來產生出多波長雷射光源之相關學術研究。接下來，我們會展現並驗證一套混合有線及無線訊號的光纖微波傳輸系統架構。透過所獲得的有線及無線訊號傳輸結果，我們驗證了此一光源的實用性，並在此基礎下，進一步的優化所開發的多波長光源架構且成功的將不同的基頻訊號同時載入成對的光源之中升頻成無線訊號。這一實驗成果除了證明本研究成果之低廉之外，亦證明了此一多光源系統的優越性。
並列摘要
In this research, we present the process of developing a novel multi-wavelength laser light source to replace multiple lasers in Wavelength-division-multiplexing (WDM) fiber-optic communication systems. Different from the current multi-wavelength laser light sources which are expensive and complex, the developed scheme can produce a multi-carrier light source by a single distributed feedback (DFB) lasers and a radio frequency (RF) generator only. Taking the advantage of this invention, we not only can simply up-convert a baseband signal into a RF range in optical domain, but also can utilize those optical carriers to support multiple networks. The developed technique can therefore be employed to simplify the network structure and to reduce the capital expenditures. To record this research, the entire research process and experimental results are presented in three parts. Firstly, the relative literature and theory of developing a multi-wavelength laser light source by a DFB laser is presented. Secondly, a hybrid wired and wireless radio over fiber (ROF) transport system is demonstrated based on the proposal. The obtained wired and wireless transmission performances are recorded and employed to verify the advancement of proposed scheme. Finally, those recorded results are utilized to optimize the multi-carrier generator. The upgraded light source is consequently employed to transmit and to frequency up-convert diverse baseband signals for different ROF networks. The recorded experimental results demonstrate an outstand performance of the proposal to provide low cost and high stable light sources for WDM transport system.