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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/69414


    Title: 同軸式全像儲存系統記錄介質具有離焦之研究;The study of the collinear holographic data storage system with disc defocus
    Authors: 鄭智元;Cheng,Chih-yuan
    Contributors: 光電科學與工程學系
    Keywords: 同軸全像資訊儲存;相位疊加法;純量繞射;相位調製;離焦;點擴散函數;位移選擇性;位移容忍度;誤碼率;訊雜比;collinear holographic data storage;VOHIL;scalar diffraction;phase modulation;defocus;point spread function;shifting selectivity;shifting tolerance;bit error rate;signal-to-noise ratio
    Date: 2016-01-27
    Issue Date: 2016-03-17 20:35:44 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 在本論文中,我們以理論估計全像儲存系統的儲存容量,以及在限制條件下,對儲存系統的影響。以純量繞射理論以及相位疊加法為基礎,建立同軸式體積全像儲存系統的模型,並且推導出當記錄介質在紀錄以及讀取過程中,含有離焦繞射公式之近軸近似解。以此公式為基礎,分析系統之點光源擴散函數、橫向位移選擇性、縱向容忍度。接著在參考光加入不同像調製,分析相位調製對上述參數的影響,並說明為何在離焦紀錄時,點擴散函數之半寬較無離焦紀錄時為窄,以及橫向位移選擇性較無離焦紀錄時為寬。最後分析在不同情況下系統的誤碼率以及訊雜比,作為同軸全像儲存系統效能的評估標準。;In this thesis, we estimate the theoretical capacity of the holographic data storage system and the effects of the storage system under the restrictions. Based on the scalar diffraction theory and VOHIL model, we establish the model of the collinear holographic data storage system. Then we derive the diffraction formula with the disc defocus in the recording and reading processes under the paraxial condition. Based on this formula, we analyze the point-spread function, transverse shifting selectivity, and the longitudinal shifting tolerance with disc defocus in the storage system. We analyze above parameters with different phase modulation in the reference beam, and then we explain why the width of the point spread function with disc defocus in the recording process is narrower than that without disc defocus, and the transverse shifting selectivity with disc defocus in the recording process is wider than that without disc defocus. Finally, we simulate the diffraction pattern with different conditions and analyze the bit-error rate and the signal-to-noise ratio for assessing the collinear holographic data storage system.
    Appears in Collections:[光電科學研究所] 博碩士論文

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