Ultra-high-speed holographic data storage system based on extending data page size

High-density storage of big data in the information age calls for higher data transmission rates. Holographic data storage technology, based on the principles of three-dimensional volume holographic recording and two-dimensional planar transmission, delivers an extremely high data transmission rate. Given the need for encoding two-dimensional data pages, spatial light modulators (SLMs) are employed for information encoding, and the modulation region of SLMs has become a key limiting factor for the data transmission rate of holographic data storage systems. However, to overcome the limitation that the limited imaging area of SLMs in holographic data storage fails to fully exploit the potential of this technology, this paper proposes an ultra-high-speed holographic data storage system based on extending data page size. The signal beams modulated by two digital micromirror devices (DMDs) are stitched and aligned through an optical system to achieve an expanded data page size. The reference beam is modulated using a mask to conserve the limited pixel resources of DMDs. Coupled with the 5:16 amplitude data encoding rule, the proposed system achieves an ultra-high data transmission rate of 20.06 Gb/s.