Modulation coding for pixel-matched holographic data storage

被引:136
作者
Burr, GW
Ashley, J
Coufal, H
Grygier, RK
Hoffnagle, JA
Jefferson, CM
Marcus, B
机构
[1] Holographic Optical Storage Team, IBM Almaden Research Center, San Jose, CA 95120
关键词
D O I
10.1364/OL.22.000639
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We describe a digital holographic storage system for the study of noise sources and the evaluation of modulation and error-correction codes. A precision zoom lens and Fourier transform optics provide pixel-to-pixel matching between any input spatial light modulator and output CCD array over magnifications from 0.8 to 3. Holograms are angle multiplexed in LiNbO3:Fe by use of the 90 degrees geometry, and reconstructions are detected with a 60-frame/s CCD camera. Modulation codes developed on this platform permit image transmission down to signal levels of similar to 2000 photons per ON camera pixel, at raw bit-error rates (BER's) of better than 10(-5). Using an 8-12-pixel modulation code, we have stored and retrieved 1200 holograms (each with 45,600 user bits) without error, for a raw BER of <2 x 10(-8). (C) 1997 Optical Society of America.
引用
收藏
页码:639 / 641
页数:3
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