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

吳其昱(Chi-Yu Wu)

指導教授 ： 孫慶成

國立中央大學/理學院/光電科學研究所/碩士(2006年)

摘要

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。

關鍵字

位元錯誤率 ； 位移多工 ； 球面波 ； 全像 ； 光學儲存

並列摘要

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.

並列關鍵字

BER ； spherical reference wave ； holographic data storage

參考文獻

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