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US 5,812,288 AGranted
Holographic storage of digital data
AssigneeLucent Technologies Inc.
InventorsKevin Curtis, Clifford Eric Martin, Thomas J. Richardson, Michael C. Tackitt, Peter M. Winkler
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Abstract
Bit error rate in holographic storage/reconstruction is reduced by 2-dimensionally dispersing symbols constituting codewords so that no two codeword-common symbols occupy a single row or column on the SLM display.
Claims14
Process comprising reconstruction of encoded data holographically stored in a storage medium, said process including
- detecting the data in the form of a 2-dimensional array of pixel rows and columns, the pixels comprising codewords constituted of codeword-common symbols, and decoding the detected data,
- CHARACTERIZED IN THAT
- codewords of the array are 2-dimensionally dispersed so that at least some of the codeword-common symbols of a particular codeword occupy different rows and columns, and in that decoding comprises reassembly of dispersed symbols to form undispersed codewords.
Process comprising holographic storage to yield stored data amenable to holographic reconstruction, the process including the steps of
- introducing input data in the form of one dimensional bit stream,
- encoding the bit stream by a process including error correction coding (ECC), thereby forming codewords each comprised of data symbols and parity symbols together constituting codeword-common symbols,
- arraying the encoded bit stream in 2-dimensional format comprised of rows and columns,
- forming a display of the arrayed bit stream on a spatial light modulator (SLM), illuminating the SLM display in order to modulate the illumination and produce a signal beam, and
- combining the signal beam with a reference beam within a holographic medium so as to produce a hologram in the medium,
- CHARACTERIZED IN THAT
- the process further comprises an additional encoding procedure for 2-dimensionally dispersing codewords so that some codeword-common symbols of a particular codeword occupy different rows and columns on the SLM.
4 more elements
Dependencies are inferred from the claim text.