Compensation for misaligned data pages based on a three-pixel model in holographic data storage

To compensate misalignments between a detector array and a spatial light modulator (SLM) in page-oriented holographic data storage, a method based on a three-pixel model is proposed. Three neighboring pixels in one-dimensional direction on the SLM that make contributions to the center pixel on the detector are considered in the three-pixel model. Recursive solutions are carried out to recover the true values of the SLM pixels. Both simulation and experimental results show that the signal-to-noise ratio (SNR) can be doubled approximately by use of the compensation method based on the three-pixel model. The proposed method is appropriate for relatively small apertures, and has the similar effects with the equalization method, which effectively improves the SNR.