Phase modulated gray-scale data pages for digital holographic data storage |
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Authors: | Bhargab Das Joby Joseph Kehar Singh |
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Institution: | Photonics Group, Physics Department, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110 016, India |
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Abstract: | We propose a method for gray level holographic digital data storage by using three-gray levels in the phase mode. Gray level data pages are displayed on a SLM operating in the phase mode to obtain a homogenized Fourier spectrum by suppressing the extremely high intensity DC component in the Fourier spectrum of conventional amplitude based binary/gray level data pages. Holographic interferometry has been used to recover the gray level amplitude data page from phase data page. Numerical simulation results are presented for three-gray level data pages. Fourier plane homogeneity, bit-error-rate, storage density, phase modulation error of the SLM, and misalignment tolerances are investigated through computer modeling. A comparison of the present method with the amplitude-modulated gray level case with and without using a phase mask in conjunction with the data page is carried out. An experimental demonstration of the proposed three-gray level phase data page method is also presented. |
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Keywords: | Holographic data storage Gray-scale data page Phase modulation Spatial light-modulator |
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