利用射頻技術實現混合乙太數位及射頻訊號之單波長光纖通訊系統; An Implementation of Hybrid Systems Using RF Technique in Single Wavelength Fiber Optic Communications

NCUIR > College of Electrical Engineering & Computer Science > Graduate Institute of Communication Engineering > Electronic Thesis & Dissertation > Item 987654321/8119

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/8119

Title:	利用射頻技術實現混合乙太數位及射頻訊號之單波長光纖通訊系統;An Implementation of Hybrid Systems Using RF Technique in Single Wavelength Fiber Optic Communications
Authors:	王心平;Hsin-Pin Wang
Contributors:	通訊工程研究所
Keywords:	馬克干赫;混合訊號;次載波;光纖通訊;單波長;調變技術;hybrid signal;single wavelength;modulation technique;Mach-Zehnder;subcarrier;fiber optic communication
Date:	2005-06-10
Issue Date:	2009-09-22 11:18:39 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	在本論文中，首先對應用於系統實現上的光電元件、射頻元件進行驗證及設計，因此對各種不同的量測平台的架設，已在光對電、電對光、或是純電性的上量測得到實際參數。為實現兩個混合訊號單波長光纖通訊系統，緊接著介紹系統中採用的訊號標準，其中包含了數位訊號的SONET標準及應用於GSM系統的訊號品質界定標準，以為系統實現上可以提供具參考價值的量測依據，並且能界定系統實現上的可行性。接著再將驗證過的元件，因應其元件特性，應用於兩個系統實現上，第一個系統是以傳統次載波調變技術，搭配射頻技術實現單一波長傳遞符合標準的乙太數位及GSM系統應用的射頻GMSK(Gaussian minimum shift keying)調變訊號，因此在此數位訊號的寬頻特性上，如何實現與射頻訊號整合的次載波調變是研究的重點，並且應用既有的純電性模擬程式建立光電轉換及光纖通道的模型，並且搭配射頻元件的模型，以進行系統評估；接下來對馬克干赫電光調變器進行一系列的分析及大訊號操作混合小訊號應用進行推導其模型，並且利用馬克干赫電光調變器的元件特性，來開發另一個名為二次光調變技術，並應用於系統上，使得數位光訊號可以與射頻電訊號同時整合，實現單波長光纖傳輸連結。 The implementation of fiber optic link with single wavelength is studied in this thesis. When a system was built, many employed components should be verified. Based on this purpose, the measuring benches of optoelectronic and radio frequency (RF) devices must be constructed for getting real parameters. In the following topic, the standards of synchronous optical network (SONET) and global system for mobile communications (GSM) with Gaussian minimum shift keying (GMSK) modulation are described, because the implemented single wavelength fiber optic systems which operated in hybrid mode need a monitoring basis. Using the verified components and standing on the standards of digital and modulated RF signals, a subcarrier modulation (SCM) system which comforted to SONET and GSM is implemented. The known broadband in spectrum of digital signal and the narrowband of carried GSM signal by RF tone are adopted, so how the microwave techniques applied to this system is our study goal. The estimating method of link which contains the electrical domains of transmitter and receiver, the electrical to optical (EO) conversion, the fiber channel, and the optical to electrical (OE) conversion, based on purely electrical simulator was also built in this topic. Next, a Mach-Zehnder electrical to optical modulator (MZ-EOM or MZM) was analyzed. An analysis of electrical small signal model with varying optical large signal model was processed. According to this innovating definition, a double optical modulation (DOM) technique applied to implementation of SCM was proposed. The digital signal in optical domain and the modulated GMSK RF tone in electrical domain were directly combined by a MZ-EOM and simultaneously propagated through a fiber channel in a single wavelength window.
Appears in Collections:	[Graduate Institute of Communication Engineering] Electronic Thesis & Dissertation

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