Collinear holographic data storage technologies
With the continuous development of information technology, information has been regarded as an important resource. Information protection, mining, and data storage technologies are particularly important. Currently, the amount of global data generated has exploded, which has increased the pressure on data storage. According to the research results of International Data Corporation (IDC), the total amount of data generated worldwide in 2010 was 1.2 ZB (1 ZB = 103 EB = 106 PB = 109 TB), and the amount of data in 2018 was 33 ZB. The latest forecast is that by 2025, the total global data will exceed 175 ZB. The hardware market for data storage has reached hundreds of billions of dollars. Optical holographic storage breaks the traditional two-dimensional optical storage mode with its three-dimensional optical storage method. Optical holographic storage has become one of the most promising mass data storage due to its higher storage density and faster data conversion rate, and long data retention life.
Comparison between traditional data storage and holographic data storage.
The research group of Prof. Tan Xiaodi from Fujian Normal University reviewed the collinear holographic data storage technology. In the background of the big data era, holographic optical storage technology has become a powerful solution for mass data storage with its ultra-high storage density, ultra-fast data conversion rate, and ultra-long life. From the context of this technology development, it can be clearly seen that holographic storage technology is striving to move from laboratory to practicality and marketization. The collinear holographic storage system has more practical and market potential due to its compactness, high stability, strong anti-interference ability and strong compatibility. This article introduces the system configuration and coding methods of traditional collinear holographic storage system, and leads to its latest development direction which is the phase-modulated collinear holographic storage technology. The use of phase coding not only improves the signal-to-noise ratio but also further increases the storage density. Aiming at the problem that the phase is difficult to read, the phase reading from the interference method (phase-locked technology) and the non-interference method (embedded iterative Fourier transform algorithm) are introduced. Finally, it is concluded that the focus of the next development still needs to be on the faster and more accurate phase reading.
About The Group
The team of Prof. Tan Xiaodi from the College of Photonic and Electronic Engineering of Fujian Normal University is mainly engaged in the research of information optics such as holographic storage and polarized holography. The research results of the team have been recognized by domestic and foreign counterparts, maintaining an international leading research level in the field of holographic storage. The team is currently undertaking one national key research and development project, and several national natural science foundations. The team has also established the Information Photonics Research Center, and established a good cooperative relationship with the University of Tokyo Institute of Production Technology, Utsunomiya University, Wakayama University, Arizona Optical Center, and Toyohashi University of Technology and Science, etc. The research center currently has 5 professors, 6 associate professors, and more than 30 master and doctoral students.
Lin X, Liu J P, Hao J Y, Wang K, Zhang Y Y et al. Collinear holographic data storage technologies. Opto-Electron Adv 3, 190004 (2020).