球面波位移多工之全像光碟讀取機構之研究

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姓名

吳其昱(Chi-Yu Wu) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

球面波位移多工之全像光碟讀取機構之研究
(The study of shifting-multiplexed volume holographic optical disc with a spherical reference wave)

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摘要(中)

我們利用球面波位移多工技術與體積全像的特性，發展一全像光儲存碟片之系統。由於位移多工造成之相位不匹配，繞射強度將隨著碟片旋轉而迅速衰減，因此我們針對碟片的位移選擇性作詳細的探討。此外，我們選定一空間調制器作為訊號光輸入元件，針對傳統光學系統與位移補償系統之不同儲存架構，探討其繞射訊號之特性，並以訊雜比與位元錯誤率詳細分析串音之影響。
本論文以相位疊加法及瑞利–索末菲理論分析體積全像的繞射訊號，並證實了位移補償系統能有效地降低串音，解決體積全像儲存之困難，使全像儲存系統之實現又往前邁進了一大步。

摘要(英)

In this thesis we investigate a shifting-multiplexed volume holographic optical system with a spherical reference wave. To provide an overview of the characterization of the volume holographic optical disc, we first calculate the spatial selectivity of the system during reading process. The following we quantitatively examine the crosstalk noise by analyzing both signal to noise ratio and bit error rate, where making use of the spatial light modulator as the object signal.
We have applied VOHIL and Rayleigh-Sommerfeld formula to simulate the diffracted pattern from a volume holographic optical disc with spherical reference wave. The shift-compensated system is proved to be free from inter-pixel crosstalk such that bit error rate can be reduced dramatically, making the realization of the volume holographic optical storage system possible.

關鍵字(中)

★ 位元錯誤率
★ 位移多工
★ 球面波
★ 全像
★ 光學儲存

關鍵字(英)

★ BER
★ spherical reference wave
★ holographic data storage

論文目次

摘要.............................................I
目錄............................................IV
第一章緒論......................................1
1.1 引言.........................................1
1.2 全像光學之發展...............................4
1.2.1 全像光學之簡介.............................4
1.2.2 光學儲存與體積全像.........................5
1.3 論文大綱與安排...............................8
第二章體積全像.................................10
2.1 布拉格條件..................................10
2.2 分析理論....................................14
2.2.1 耦合理論法................................14
2.2.2 相位疊加法................................28
第三章穿透式體積全像之光儲存碟片系統...........32
3.1 系統架構....................................32
3.2 相位疊加法之模擬與取樣分析..................35
3.2.1 相位疊加法之模擬..........................35
3.2.2 取樣點之分析..............................37
3.3 繞射光點位移補償效應........................43
3.4 光儲存碟片系統之位移選擇性..................46
3.4.1 碟片切線方向之位移選擇性與串音分析........46
3.4.2 碟片徑向之位移選擇性分析..................51
3.4.3 碟片之振動分析............................53
第四章空間調制器為訊號光之串音分析.............56
4.1 空間調制器的理論模型........................56
4.2 布拉格不匹配之串音分析......................60
4.2.1 同頁的畫素串音分析........................63
4.2.2 多頁的光柵串音分析........................67
4.3 訊雜比之分析................................72
4.3.1 同頁之訊雜比..............................72
4.3.2 多頁之訊雜比..............................75
第五章系統位元錯誤率之分析.....................78
5.1 位元錯誤率之介紹............................78
5.2 近似解析解之討論............................81
5.3 位元錯誤率之分析............................85
5.3.1 同頁畫素串音..............................85
5.3.2 多頁光柵串音..............................93
5.4 透鏡與4F系統................................94
第六章結論.....................................96
參考文獻........................................98
中英文名詞對照表...............................102

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指導教授

孫慶成(Ching-Cherng Sun)

審核日期

2006-7-19

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