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

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姓名

王心平(Hsin-Pin Wang) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

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)

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摘要(中)

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。

摘要(英)

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.

關鍵字(中)

★ 馬克干赫
★ 混合訊號
★ 次載波
★ 光纖通訊
★ 單波長
★ 調變技術

關鍵字(英)

★ hybrid signal
★ single wavelength
★ modulation technique
★ Mach-Zehnder
★ subcarrier
★ fiber optic communication

論文目次

1 導論 1
1.1 縱述混合訊號之單波長ROF系統 1
1.2 論文動機與架構 4
2 應用元件之測試及開發 6
2.1 光電元件原理、量測系統及測試 6
2.1.1 光檢測器之原理 7
2.1.2 轉阻放大器之原理 11
2.1.3 光檢測器與轉阻放大器之封裝模組量測 12
2.1.4 馬克干赫電光調變器之原理 13
2.1.5 馬克干赫電光調變器之量測 15
2.2 射頻元件量測系統及測試 17
2.2.1 混波器量測 17
2.2.2 高範圍之窄頻應用放大器量測 18
2.3 微波濾波器、功率分配器設計及製作 19
2.3.1 微波濾波器設計 19
2.3.2 微波功率分配器設計 20
2.3.3 濾波器及功率分配器之實作 20
3 次載波光纖通訊系統 25
3.1 光纖通訊系統簡介 25
3.1.1 數位光纖網路 26
3.1.2 GSM系統及類比光纖系統 29
3.2 光纖通訊系統簡介 30
3.2.1 電對光轉換之直接調變及外部調變 30
3.2.2 次載波單波長光纖連結系統架構 32
3.3 次載波單波長光纖連結模擬架構及結果 35
3.3.1 電對光轉換模擬模型建立 36
3.3.2 光對電轉換模擬模型建立 36
3.3.3 模擬架構及結果 38
3.4 次載波單波長光纖連結實驗結果 41
4 二次光調變之光纖通訊系統 44
4.1 馬克干赫電光調變器之物理機制 44
4.2 二次光調變之理論及系統架構 49
4.2.1 二次光調變之物理機制 49
4.2.2 二次光調變之系統架構 53
4.3 二次光調變系統之實驗結果 54
5 結論 63
參考文獻 66
發表論文 69

參考文獻

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指導教授

詹益仁(Yi-Jen Chan)

審核日期

2005-6-16

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