A control method for the angle servo of reference beam during reading recoded data images of a holographic data
storage system is presented. The recording scheme with track offset is adopted in order to verify the proposed angle
servo. Using only recorded data tracks the angle error signal of reference beam is generated and the angle servo is
implemented. Experiments have been performed on recording and reading data images to compensate Bragg angle mismatch.
A holographic data storage prototype fully integrated with electronics for video demonstration has been developed. It can
record data in several tracks of a photopolymer disk and access them arbitrarily during retrieving process from the
continuously rotating disk. An embedded controller operates all of the optomechanical components of the prototype
automatically and electronic parts conduct adaptive data readout of channel data up to 55 megabit per sec. For real-time
video demonstration, video stream are recorded in four concentric circular tracks of the disk. Each recording spot
contains about one hundred pages with angle multiplexing. The eleven minute length video data are successfully
reconstructed from the prototype.
We propose a new error correction scheme for holographic data storage. It provides volumetrically coupled ECC blocks with iterative decoding, which can cover seriously corrupted pages, may occur due to imperfect recording media or other defects on optical devices in page based holographic memory.