基於遺傳算法的光相控陣相位誤差校正與優化｜國立臺灣科技大學博碩士論文系統

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研究生：	Harjuno Hutomo Harjuno Hutomo
論文名稱：	基於遺傳算法的光相控陣相位誤差校正與優化 Phase Error Correction and Optimization of Optical Phased Arrays Based on Genetic Algorithm
指導教授：	李三良 San-Liang Lee
口試委員:	徐世祥 Shih-Hsiang Hsu Kimio Oguchi Kimio Oguchi 洪勇智 Yung-Jr Hung
學位類別：	碩士 Master
系所名稱：	電資學院 - 電子工程系 Department of Electronic and Computer Engineering
論文出版年：	2021
畢業學年度：	109
語文別：	英文
論文頁數：	66
中文關鍵詞：	相位優化、相位誤差、相位分佈、GA 、PSLL 、優化區域、轉向角
外文關鍵詞：	phase optimization, phase error, phase distribution, GA, PSLL, optimization region, steering angle
相關次數：	點閱：180 下載：5
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光相控陣 (OPA) 的相位優化和相位誤差校正是將 OPA 應用於光學傳感的一項重要任務，因為陣列波導之間的製造引起的相位誤差會在遠場模式 (FFP) 中形成不需要的旁瓣。因此，需要一種能夠進行相位分佈優化的算法，以提高 FFP 的質量。在這項研究中，我們開發了相位分佈和糾錯算法。所提算法基於遺傳算法（GA）並配備尋峰算法以提高算法的準確性和自適應變異以維持高質量種群。所提出的算法可以執行各種OPA參數的相位優化，例如窄波導間距和大量天線。最後，在仿真結果中，所提出的算法實現了 15.58 dB 的 PSLL，並從 -4° 到 4° 進行了波束控制優化。我們還優化了 4.5 μm 波導間距和 1024 個天線的 OPA，PSLL 分別為 11.61 dB 和 12.09 dB。該算法不僅可以用於相位優化，還可以用於相位誤差估計和校正，可以將PSLL從1.1 dB提高到15.08 dB。

Phase optimization and phase error correction of Optical Phased array (OPA) is an important task in applying OPAs for optical sensing due to the fabrication induced phase errors among the arrayed waveguides that form unwanted side-lobes in the far-field pattern (FFP). Thus, an algorithm that is able to conduct phase distribution optimization is required in order to enhance the quality of FFP. In this research, we develop phase distribution and error correction algorithm. The proposed algorithm is based on the genetic algorithm (GA) and equipped with peaks finder algorithm to increase the accuracy of algorithm and adaptive mutation to maintain the high-quality population. The proposed algorithm can perform phase optimization of various OPA parameters such as narrow waveguide spacing and high number of antennas. Finally, in the simulation result, the proposed algorithm achieves PSLL of 15.58 dB and performed beam steering optimization from -4° to 4°. We also optimize 4.5 μm waveguide spacing and 1024-antennas OPA with PSLL of 11.61 dB and 12.09 dB, respectively. The algorithm not only can be used for phase optimization, but also can be used for phase error estimation and correction which can improve PSLL from 1.1 dB to 15.08 dB.

ABSTRACT    i
ACKNOWLEDGMENTS    ii
CONTENTS    iii
LIST OF FIGURES    v
LIST OF TABLES    vi

CHAPTER 1-INTRODUCTION    1
1.1 Background    1
1.2 Prior Works    3
1.2.1 Phase Optimization of OPA Based on Particle Swarm Optimization (PSO)    3
1.2.2 Phase optimization of OPA Based on Genetic Algorithm (GA)    5
1.3 Contribution    8

CHAPTER 2-LITERATURE REVIEW    9
2.1 Realization of Optical Antenna Arrays with Silicon Photonics Technology    9
2.2 Phased Array Antenna Principle    10
2.3 Genetic Algorithm (GA) Principle    11

CHAPTER 3-PROPOSED METHOD    13
3.1 Random Phase (phase Error) Formulation    15
3.2 Phase Optimization Algorithm    18
3.2.1 Initialization    18
3.2.2 Peak Side-Lobe Level (PSLL) Calculation    19
PSLL Calculation for Beam Steering     20
3.2.3 Parents Selection and Crossover    21
3.2.4 Mutation & Next Generation’s Population    22
3.3 OPA Calibration    24
3.3.1 Phase Error Estimation    24
3.3.2 Phase Error Correction    26

CHAPTER 4-SIMULATION RESULTS    27
4.1 Phase Optimization    27
4.1.1 Iteration Number Comparison    27
4.1.2 Phase Distribution Range Comparison    30
4.1.3 Beam Steering Optimization    32
4.1.4 OPA with 4.5 μm Antenna Spacing    34
4.1.5 OPA with 1024-antenna    35
4.2 OPA Calibration     37
4.2.1 Phase Error Estimation    37
4.2.2 Phase Error Correction    39

CHAPTER 5-CONLUSION    41
5.1 Summary of Results and Contributions    41
5.2 Future Work    42

REFERENCES    45
APPENDIX    50

                                

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