UWB(Ultra Wide Band，超寬頻)為短脈衝訊號，主要適用於短距離無線傳輸上，具有系統容量大、保密性好等特性。本實驗室先前是使用交叉吸收調變(XAM)的效應，來實驗波長轉換光訊號。本研究採取另一種方法，將輸入光準位提高，由於電致光吸收元件算是屬於自電光效應元件(SEED)的一種，因此提高光准位即可讓訊號在元件內產生自我調變作用,以產生單周期脈衝(monocycle pulse)電流以及光訊號。單周期脈衝訊號是高斯訊號的微分，本實驗使用Mach-Zender產生一個脈衝訊號，而將電致光吸收元件視作為微分器，在經過一顆元件之後，即可產生單周期脈衝訊號。

Ultra Wide Band (UWB) is a short-pulse electrical signal which is widely used for short distant wireless communication because its low path loss, good immunity to multipath propagation, and high data rate. The reason of using optical fiber as carrier is fiber can bust up the communication capacitance in long distance range because of high capacitance, low loss propagation. Thereby, the technique of UWB signal on fiber has become more and more important. In this work, a novel method using electro-absorption modulation with short termination for interface of optical fiber and generate UWB signal is proposed and demonstrated. The structure is simple.This method don’t need employing any complicated frequency mixer, or complex systems.
This work need to generate optical pulse with high energy, which is feded into the EAM. The signal can generate electrical pulse and build electrical field on EAM in the same time. The optical pulse is modulated by the electrical field on EAM. Using this way, we can generate UWB optical signal.

目錄 1
致謝 2
中文摘要 4
英文摘要 5
第一章 緒論 6
1.1 研究動機 6
1.2 系統產生光的超寬頻訊號 11
第二章 原理 15
2.1 產生單週期脈衝(monocycle pulse)訊號產生原理 15
2.2電致光吸收元件之結構與原理 19
2.3 訊號產生原理比較 23
第三章 特性研究與實驗 25
3.1電致光吸收元件特性量測 25
3.2 超寬頻訊號研究架設 29
參考資料與文獻 35

[1] SUMIT ROY, JEFF R. FOERSTER, V. SRINIVASA SOMAYAZULU, AND DAVE G. LEEPER. "Ultrawideband Radio Design: The Promise of High-Speed, Short-Range Wireless Connectivity." PROCEEDINGS OF THE IEEE, VOL. 92, NO. 2, FEBRUARY 2004.
[2] M.GHAVAMI, L.B.MICHAEL, R.KOHNO. "ultra wideband signals and systems in communication engineering . "
[3] Liuqing Yang and Georgios B. Giannaki . "Ultra-Wideband Communications." IEEE SIGNAL PROCESSING MAGAZINE NOVEMBER 2004
[4] Yannis Le Guennec, Mounia Lourdiane, Béatrice Cabon, Ghislaine Maury and Philippe Lombard(2006)."Technologies for UWB-Over-Fiber." IEEE:518-519
[5] Jianping Yao, Fei Zeng, and Qing Wang.(2007). "Photonic Generation of Ultrawideband Signals." JOURNAL OF LIGHTWAVE TECHNOLOGY-25( 11):3219-3235
[6] Behzad Razavi. "Gadgets Gab at 60 GHz" SPECTRUM.IEEE, February 2008
[7] F. Zeng and J. P. Yao.(2006). "An approach to ultra-wideband pulse generation and distribution over optical fiber, ."IEEE Photon. Technol. Lett.,-18(7):823–825
[8] F. Zeng, Q. Wang, and J. P. Yao.(2007). "All-optical UWB impulse generation based on cross phase modulation and frequency discrimination."Electron. Lett.,- 43( 2): 119–121
[9] Q. Wang, F. Zeng, S. Blais, and J. P. Yao.(2006). "Optical UWB monocycle pulse generation based on cross-gain modulation in a semiconductor optical amplifier."Opt. Lett.-31( 21)-:3083–3085
[10] C. Wang, F. Zeng, and J. P. Yao. (2007)."All-fiber ultra wideband pulse generation based on spectral shaping and dispersion-induced frequency-to-time conversion.."IEEE Photon. Technol. Lett.,-19( 3): 137–139
[11] Yi-Fan Choi (2008) ."High-Speed Characterization and System Application on Electroabsorption Modulators." National Sun Yat-sen University, Institute of Electro-Optical Engineering
[12] 游佳勳(2007)." Mode Locked Fiber-Ring Laser using the Spot-Size Converter Integrated Electroabsorption Modulator" National Sun Yat-sen University, Institute of Electro-Optical Engineering
[13] F. Devaux, F. Dorgeuille, A. Ougazzaden, F. Huet, M. Carre, A. Carenco, M. Henry, Y. Sorel, J. F. Kerdiles, and E. Jeannery.( 1993)."20 Gbit/s Operation of a High-Efficiency InGaAsP/InGaAsP MQW Electroabsorption Modulator With 1.2-V Drive Voltage." IEEE Photonics Technol.-5: 1288-1290