臺灣博碩士論文加值系統

UWB(Ultra Wide Band，超寬頻)為短脈衝訊號，其適用於短距離無線通訊，它具有多徑分辨能力強、系統容量大等優勢，超寬頻訊號主要傳輸距離約在10米內，目前可利用光纖之高速低損耗特性配合TDM (分時多工)和WDM(分波多工)系統架設達到廣域的高容量訊號傳輸，本研究提出一個簡單且新穎的方法，不需要複雜的頻率混合器、濾波器、複雜的系統架設且可以有效減少成本，主要是利用波導檢測器有效率的將光訊號轉換成無線超寬頻以達到有線無線轉換介面。
本研究分成兩個部份一為產生超寬頻訊號，二為波長轉換，第一個部份首先輸入高重複率脈衝串列式雷射光源至波導檢測器，讓波導檢測器產生光電流，在波導檢測器上低損耗的微波終端區加上終端電阻Short，使輸入光訊號傳輸至終端區後反射回原介面且相位反轉，以達成超寬頻訊號，本研究已可產生單周期脈衝的超寬頻訊號，頻寬大約為8GHz，且此訊號可符合聯邦通訊委員會(FCC)所規定之規範內，優勢在於可藉由外部調整，使超寬頻型態最佳化。
第二個部份利用photocurrent regeneration signal效應來達成波長轉換，因為超寬頻訊號會於元件上產生偏壓，因此利用此電場調變輸出的光穿透量以達成波長轉換，此系統最大的優點是當輸入串列式脈衝光源時，不但可以產生超寬頻訊號，還可以同時將超寬頻訊號轉至另一載波波長上，也可以在密閉網域中當作路由器(route)來使用。

Ultra Wide Band (UWB) is a short-pulse electrical signal, which is widely used for short distant wireless communication due to its low path loss, good immunity to multipath propagation, and high data rate. The main target transmission area of UWB is within 10 meters. Using optical fiber as carrier can bust up the communication capacitance in long distance range because of high capacitance, low loss propagation, and TDM and WDM compatible properties of fiber. Thereby, the technique of UWB on fiber has become more and more important. In this work, a novel method using waveguide photodetector (WP) with short termination for interface of optical fiber and wireless is proposed and demonstrated. The structure is simple without employing any complicated frequency mixer, intermediate frequency, or complex systems.
This work is divided into two parts: (1) generation of UWB electrical signals and (2) wavelength conversion of UWB through WP. In the former, a WP with short termination is used in the device. The photocurrent excited by short optical pulse is distributive generated through the waveguide, forming two opposite directions of electrical waves. By reflection on the short termination, the reversed phase of one electrical wave is added to another electrical wave through a delay line, forming a monocycle of UWB signal. By appropriate design on the length of waveguide, the band of 2-10GH is demonstrated, fitting the requirement of FCC (Federal Communications Commission).
In the second part of this paper is the wavelength conversion of UWB. The active region of WG is multiple quantum wells (M.Q.W.), which is not only served as photo-absorption layer, but also can be used the electroabsorption material. By pumping M.Q.W.s with high optical power, the cross absorption properties can be applied for wavelength conversion. By pumping power of 12dBm, the wavelength-converted UWB signal is successfully demonstrated at range of 1545nm-1570nm. Using this method, the application of UWB on router of fiber optical network is expectable.

中文摘要………………………………………………………...………..I
英文摘要……………………………………………….……………….III
致謝…………………………………………………….……………….IV
目錄………………………………………………………………….......V
圖目錄………………………………………………….……………... VII

第一章 緒論……………………………………………………………..1
1.1 研究動機…………………………………………………………….1
1.2 簡介………………………………………………………………….6
1.3 論文架構…………………………………………………………….9
第二章：原理…………………………………………………………...10
2.1 產生UWB(Ultra Wide Band，超寬頻)訊號之原理………………10
2.2 波導檢測器之結構與原理……………………………………….20
2.2.1 波導檢測器之結構………………………………………..20
2.2.2 光子與載子在半導體波導中的效應……………………..22
2.2.3 光子與載子在吸收層的效應……………………………..23
2.3 波長轉換器之原理 ……………………………………………...25
第三章 特性研究與實驗結果…………………………………………29
3.1 波導檢測器特性量測…………………………………………….29
3.2 光對電的頻率響應(OE Response) ………………………………33
3.2.1 電對電的頻率響應(EE Response) ……………………………33
3.2.2高頻響應………………………………………………………….35
3.3 超寬頻研究架設與結果討論 ……………………………….40
3.4 波長轉換器之研究架設與結果討論…………………………….46
第四章 結論……………………………………………………………52
參考資料與文獻………………………………………………………..54
附錄……………………………………………………………………..58

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