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研究生:王振宇
研究生(外文):Cheng-Yu Wang
論文名稱:使用在非線性光纖中的極化偏轉現象來完成全光互斥或邏輯閘運算
論文名稱(外文):All-Optical XOR Operation Generation Using Nonlinear Polarization Rotation in a Single Highly Nonlinear Fiber
指導教授:馮開明
指導教授(外文):Kai-Ming Feng
學位類別:碩士
校院名稱:國立清華大學
系所名稱:光電工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:88
中文關鍵詞:互斥或邏輯閘非線性光纖極化偏轉光柯爾效應相位匹配錯位半導體光放大器光曼徹斯特碼
外文關鍵詞:Exclusive-OR Logic GateHNLFPolarization RotationOptical Kerr EffectPhase-MatchingWalk-OffSOAOptical Manchester Code
相關次數:
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近年來,人們對於光纖通訊網路的需求量漸漸愈來愈大了,因此為了使得傳輸速度加快,我們並不希望使用到任何的光電轉換,因為一旦牽扯到電的信號處理領域,資料的傳輸速度就不快了(在電的領域上傳輸資料最多可以達到幾百Mb/s,但是在進入光的領域內,傳輸資料可以達到幾十Gb/s),而全光互斥或邏輯閘在全光學信號處理中算是不可或缺的角色之ㄧ。在光纖通訊網路中使用非線性光纖來完成全光互斥或邏輯閘具有以下三個明顯的優點:(1)不需要再額外的元件去做光電轉換之後才去作邏輯運算處理,(2)在非線性光纖中具有超快的非線性響應時間(約2到4飛秒等級),(3)與整個傳輸系統中的光纖具有良好的相容性。這些許多的優點使得利用非線性光纖所兜出來的元件模組在現今許多不同的研究團隊中漸漸給予高度密切的注意並肯定其潛力所在。在本篇論文中,我們嘗試著使用光信號在非線性光纖中的極化方向旋轉方法來完成全光互斥或邏輯閘運算。在本篇論文中最後的結果也證實此觀念想法在使用10Gb/s和20Gb/s的光信號也的確能完全符合互斥或邏輯閘運算理論上應當的結果。另外,我們試著去調整ㄧ些參數,包括輸入的光信號功率和波長的選取、所使用的非線性光纖之長度和其本身損耗值,進而去觀察這些參數的變化會對於全光互斥或邏輯閘運算的表現會有所如何的影響。經過本篇論文的研究結果顯示,這些參數的選取的的確確扮演影響全光互斥或邏輯閘運算的表現的重要角色。當輸入光信號的功率和非線性光纖長度的分別選取在適當的值皆會使得全光互斥或邏輯閘得到其最大的輸出功率來。除此之外,研究結果亦顯示出當兩個輸入光信號的波長選取差距愈遠的話,會影響到全光互斥或邏輯閘最後所得到的轉換光信號品質劣化愈嚴重,此現象在更高速的資料傳輸速度下更加明顯。這些研究所觀察的結果趨勢將有助於我們對於如何適當操作全光互斥或邏輯閘並且得到其較佳的轉換光信號表現,預期這些上述所完成的研究成果將會有助於下ㄧ世代光纖通訊系統的發展。
In recent days, the demand for high speed photonic communication networks was much larger little by little. A key building block in many areas of optical signal processing is just the all-optical XOR logic gate. For the fiber-based reconfigurable high-speed optical network, an all-fiber solution for the XOR gate is highly desirable with the added advantages of (i) no need for OE/EO conversion, (ii) ultrafast nonlinear response time (~2-4 fs) of Kerr effect in the fiber, and (iii) excellent fiber compatibility. These advantages make highly nonlinear fiber devices to be attracting considerable attention in the aspects of many researches. In this thesis, we try to simulate to achieve all-optical XOR logic function by using polarization rotation in a single HNLF at 10 Gb/s and 20 Gb/s. Thus, we accomplished signal-processing in all-optical domain. Besides, we also try to tune some parameters, for example, the selections of the input power and wavelength of lasers and the length and fiber loss of the highly nonlinear fiber (HNLF), to investigate the influence on the performance of the all-optical XOR logic gate. The results of this research will reveal the fact that these parameters indeed play an important role in the performance of all-optical XOR logic gate by using polarization rotation in a single HNLF. As a result, we will understand how to use these appropriate parameters of all-optical XOR logic gate in order to get the better performance of it based on the concept of using a highly nonlinear fiber. These investigations and demonstrations will be useful expectedly in the field of high speed photonic communication networks for the next generation.
CONTENTS

Chinese Abstract…………………………………………………Ⅰ
English Abstract…………………………………………………Ⅱ
Acknowledgements…………………………………………………Ⅲ
Contents……………………………………………………………Ⅳ
List of Figures…………………………………………………Ⅴ
List of Tables……………………………………………………Ⅵ


CHAPTER 1
Introduction………………………………………………………1

1.1 Review of the comparison of electric logic and
photonic logic………………………………………………2
1.2 Review of the methods to generate all-optical XOR
logic operation……………………………………………6
1.3 The motivation of research………………………………9
1.4 The structure of the thesis……………………………9


CHAPTER 2
The Phenomena of Dispersion Effect and Nonlinear Effect
in Optical Communication Systems……………………………10

2.1 Dispersive Effects in Optical Fiber Communication
Systems………………………………………………………10
2.1.1 Chromatic Dispersion………………………………10
2.1.1.1 Pulse Walk-Off……………………………15
2.1.1.2 Pulse Broadening…………………………15
2.1.2 Polarization Mode Polarization (PMD)…………16
2.2 Fiber Nonlinearities……………………………………19
2.2.1 Nonlinear Refraction………………………………21
2.2.2 Nonlinear Phase Shift……………………………22
2.2.3 Self-Phase Modulation and Cross-Phase
Modulation……………………………………………23
2.2.3.1 Self-Phase Modulation……………………23
2.2.3.2 Cross-Phase Modulation……………………25
2.2.4 Stimulated Scattering………………………………26
2.2.5 Four-Wave Mixing……………………………………27


CHAPTER 3
All-Optical XOR Gate Generation………………………………30

3.1 Optical Kerr Effect………………………………………30
3.2 The Nature of Polarized Light…………………………31
3.2.1 Linear Polarization…………………………………32
3.2.2 Circular Polarization………………………………34
3.2.3 Elliptical Polarization……………………………35
3.3 All-Optical XOR Gate Generation ………………………38
3.3.1 The Principle of All-Optical XOR Gate
Generation……………………………………………38
3.3.2 Highly Nonlinear Fiber (HNLF)……………………40
3.3.3 The Simulation Setup of All-Optical XOR Gate
Generation……………………………………………44
3.3.4 The Simulation Pattern Results of All-Optical
XOR Gate Generation…………………………………48
3.3.5 The Efficiency of All-Optical XOR Gate
Generation……………………………………………53
3.3.5.1 Input Pump Power V.S. Output Power……53
3.3.5.2 HNLF Length V.S. Output Power…………60
3.3.5.3 HNLF Fiber Loss V.S. Output Power……62
3.3.6 The Wavelength Selections of Lasers for All-
Optical XOR Gate Generation………………………63
3.3.7 The BER Curve for All-Optical XOR Gate
Generation……………………………………………72


CHAPTER 4
Summary for the Thesis…………………………………………74

4.1 Conclusion and discussion………………………………74
4.2 Suggestions for the future work………………………75


Appendix
Characteristics of Optical Manchester Coding……………81
Reference……………………………………………………………84
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