title: Modulation coding for pixel-matched holographic data storage.
abstract: 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 LiNbO(3):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 ~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 <2x10(-8).
authors.forename: G W
authors.initials: GW
authors.lastname: Burr
authors.forename: J
authors.initials: J
authors.lastname: Ashley
authors.forename: H
authors.initials: H
authors.lastname: Coufal
authors.forename: R K
authors.initials: RK
authors.lastname: Grygier
authors.forename: J A
authors.initials: JA
authors.lastname: Hoffnagle
authors.forename: C M
authors.initials: CM
authors.lastname: Jefferson
authors.forename: B
authors.initials: B
authors.lastname: Marcus