利用相位調製改良同軸式體積全像儲存系統

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姓名

鄭智元(Chih-yuan cheng) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

利用相位調製改良同軸式體積全像儲存系統
(Improving diffraction quality of the collinear holographic storage system with phase modulation)

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摘要(中)

在本論文中，我們以相位疊加法為基礎，建立同軸式體積全像儲存系統的模型並推導出系統繞射公式之近軸近似解。以此公式為基礎，分析各項參數對系統的影響，包含參考光分布、光源波長、透鏡焦距以及記錄介質厚度。接著在參考光部分加入相位調製，分析相位調製對系統的點光源擴散響應以及位移選擇性的影響。最後分析不同情況下系統的誤碼率以及訊雜比，作為光儲存系統效能的評估標準。

摘要(英)

In this thesis, we establish the theoretical model of the collinear holographic storage system and derive the formula for readout lights under paraxial condition based on VOHIL model. According to the formula, we analyze the key properties of the holographic system, including the effects caused by the reference beam, by the wavelength, by the focal length of the lens, and by the thickness of the recording medium. Besides, we analyze the point spread function and the shifting selectivity when the reference light is phase modulated. Finally we simulate the BER and the SNR of the systems.

關鍵字(中)

★ 誤碼率
★ 位移選擇性
★ 點光源擴散響應
★ 同軸
★ 全像儲存系統
★ 相位調製
★ 訊雜比

關鍵字(英)

★ shifting selectivity
★ point spread function
★ holographic data storage
★ phase modulation
★ collinear
★ bit error rate
★ signal to noise ratio

論文目次

摘要 I
致謝 III
目錄 IV
圖索引 VI
表索引 IX
第一章緒論 1
1-1 前言 1
1-2 全像術發展及儲存技術簡介 3
1-3 論文大綱 6
第二章體積全像及其繞射效率 8
2-1 全像術簡介 8
2-2 布拉格條件 10
2-3 耦合波理論 15
2-4 波恩近似法 26
2-5 相位疊加法 30
第三章同軸式體積全像儲存系統 34
3-1 同軸式體積全像儲存系統架構 35
3-2 系統理論模型 38
3-3 近軸近似關係式推導 40
3-4 系統基本參數分析 46
3-4-1 點光源擴散響應 46
3-4-2 位移選擇性 48
3-4-3 改變不同波長光源 50
3-4-4 改變不同透鏡焦距 51
3-4-5 改變不同的碟片厚度 53
3-5 結論 55
第四章系統的模擬分析與改良 56
4-1 點光源擴散響應 56
4-1-1 改變參考光圖形分布 56
4-1-2 改變參考光發光面積 59
4-2 參考光加入相位調制 61
4-2-1 相位分布為0、π相位調製 62
4-2-2 使用相位空間光調製器產生隨機相位(random phase)調製 64
4-2-3 利用透鏡來產生相位調製 65
4-2-4 使用相位空間光調制器產生透鏡相位來進行相位調製 78
4-3 位移選擇性 80
4-3-1 改變參考光圖形分布 81
4-3-2 改變參考光發光面積比例 82
4-3-3 參考光加入相位調製 83
4-4 利用快速傅立葉轉換分析點光源擴散響應 85
4-5 結論 87
第五章以二維訊號輸入與誤碼率分析 88
5-1 以空間光調制器輸入二維訊號 88
5-2 誤碼率介紹 89
5-3 以空間光調制器輸入訊號光之模擬與誤碼率評估 92
5-3-1 不同參考光之單頁串音 93
5-3-2 參考光加入相位調製之單頁串音 96
5-3-3 碟片位移時的繞射光分布 101
5-4 結論 104
第六章結論 105
參考文獻 107
附錄 A 111
中英文名詞對照表 118

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指導教授

孫慶成(Ching-cherng Sun)

審核日期

2008-7-18

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