Holographic data storage using polarization code

Current holographic data storage (HDS) systems mainly use amplitude and phase modulation for data encoding, while polarization is limited to multi-channel multiplexing, often causing operational difficulties and system complexity. To solve this, we propose a new, to the best of our knowledge, method that combines multiple polarization states into a single data page. Using polarization holography theory, we developed a reconstruction method capable of accurately reconstructing data pages with different polarization information. This method encodes data directly through multiple polarization states on one page. Decoding is simplified using a single 45° linear polarizer before the camera, enabling efficient distinction between different polarization states. Experiments show zero-error decoding for 2-, 3-, and 4-level polarization data pages. This research simplifies system design, reduces operation complexity, and expands HDS encoding dimensions, offering a new technical approach for practical high-density holographic storage.