Abstract

One thousand volume holographic data pages, each containing 1×106pixels, are stored in a common volume of LiNbO3:Fe by use of the 90° geometry. An effective transverse aperture of 1.6 mm×1.6 mm, realized by repetition of this experiment at each of the eight surrounding locations, results in a demonstrated areal density of 394 pixels/μm2 254 Gpixels/in.2. Short-focal-length Fourier optics provide a tightly confined object beam at the crystal; the reference beam is angle multiplexed. Data pages retrieved with a 1024×1024 CCD camera are processed to remap bad spatial light modulator pixels and to compensate for global and local pixel misregistration and are then decoded with a strong 8-bits-from-12-pixels modulation code. The worst-case raw bit-error rate (BER) before error correction was 1.1×10-3, sufficient to deliver a user BER of 10-12 at an overall code rate of 0.61 user bits per detector pixel. This result corresponds to 1.08% of the well-known theoretical volumetric density limit of 1/λ3.

© 2001 Optical Society of America

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