INTERLEAVING AND ERROR-CORRECTION IN VOLUME HOLOGRAPHIC MEMORY-SYSTEMS

We study the use of error-correction coding (ECC) and two-dimensional interleaving for volume holographic memory (VHM) systems suffering fro m both random and systematic errors. The bit-error rate (BER) is used as the data-fidelity measure and as a design metric for optical 4f sys tems. The correlated error patterns arising from both lens aberrations and misalignment errors are analyzed, and we discuss the information theoretic storage capacity of VHM in the presence of such correlated e rror patterns. The performance of interleaving and ECC is analyzed fro m both BER and storage-capacity perspectives. Magnification, rotation, tilt, and defocus errors are also studied, and an experimental demons tration that combines ECC with two-dimensional interleaving is include d. (C) 1998 Optical Society of America.