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  • 學位論文

體積全像儲存系統的儲存容量與誤碼率研究

Study on Storage Capacity and Bit Error Rate of Volume Holographic Memories

指導教授 : 許根玉

摘要


我們在論文中探討體積全像多工儲存系統中雜訊對系統參數的影響。根據通訊頻道模型,我們可以估計光學不完美產生之雜訊對輸出訊號所造成的影響。在多工記錄全像於同一位置後,頁面串音雜訊會隨著繞射光一同出現,套用波恩近似法,我們可以得到輸出訊號的光強度機率分布(PDF),經過計算我們可以得到系統的效能參數包括:儲存頁數、誤碼率、以及儲存容量,亦可求得最佳化的系統架構參數。在光學實驗中,我們可藉由讀取第一張全像的輸出訊號PDF來預測系統所能容忍的儲存頁數,我們藉由設定誤碼率上限值來決定儲存頁數上限,並利用儲存頁數數據來建構電腦程式模擬與設計光學實驗。文中採用的光學架構為離軸式角度多工體積全像儲存系統,所使用的全像材料為光資訊實驗室研發的PQ-PMMA感光高分子材料。

並列摘要


We report the influence of hologram multiplexing on the noises in volume holographic memories. Based on the communication channel model, we can estimate the influence caused by optical imperfection noise. After multiplexing recording, inter-page crosstalk noise will come out with the diffraction light. By applying Born approximation, the probability density function (PDF) of the readout signals can be calculated. Then, the system parameters such as maximum storage pages, bit error rate, and storage capacity of the memory system are obtained. Optimizations of the system parameters are investigated.

參考文獻


1. Gu, C., J. Hong, et al."Cross-talk-limited storage capacity of volume holographic memory," J. Opt. Soc. Am. ,1992.
2. Heanue, J. F., M. C. Bashaw, et al., "CHANNEL CODES FOR DIGITAL HOLOGRAPHIC DATA-STORAGE." J. Opt. Soc. Am. A, Vol. 12, 1995.
3. M. Schwartz, W. R. Bennett, and S. Stein, “Communications Systems and Techniques.”
4. Neifeld, M. A. and W. C. Chou, "Information theoretic limits to the capacity of volume holographic optical memory." Applied Optics, 1997.
5. E. S. Maniloff and K. M. Johnson, “Maximized holographic storage,” J. Appl. Phys. ,1991.

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