Apparatus for storing/restoring holographic data and method for coding/decoding holographic data

An apparatus for storing/restoring holographic data, comprising:

• a light source for generating a laser beam;
• a beam splitter for splitting the laser beam into a reference beam and an object beam;
• a first grouping block for dividing input data into a plurality of groups, each of which includes two binary digits;
• a coding block for encoding each of the groups into a 2×2 data block wherein a first row of the 2×2 data block has the two binary digits and a second row of the 2×2 data block has another two binary digits generated by applying a binary differential calculation on the two binary digits included in the first row;
• a modulator for generating a signal beam by modulating the object beam in accordance with the 2×2 data block;
• a storage media for storing an interference pattern generated through an interference of the reference beam with the signal beam;
• a second grouping block for dividing a signal restored from the storage media into a plurality of 2×2 data blocks;
• and
• a decoding block for decoding each of the 2×2 data blocks outputted from the second grouping block into two binary digits by comparing values of a first row of the 2×2 data block with those of a second row of the 2×2 data block.