Exhibition

Next Generation Broadcasting Devices

High-speed Data Readout in Holographic Memory

Outline
We are conducting research into ultra-high capacity holographic memory that will enable extremely high-speed recording and readout of video signals, with the goal of providing archive storage for Super Hi-Vision programs. The exhibit shows experimental equipment that can reproduce two-dimensional data pages※1 at 500 Mbps, which is four times faster than what we achieved last year.

Features

●High-speed processing of playback signal by parallel processing
We have developed an algorithm that rapidly acquires a two-dimensional data page that is reproduced from a hologram. We implemented this algorithm in a parallel processing unit and improved the transfer rate during reproduction.
●Optical compensation for hologram distortion using highly accurate wavefront control
When hologram distortion occurs due to volumetric changes in the recording medium, data can be reproduced accurately by controlling the wavefront of the reference beam. The optical compensation enables accurate data reproduction even with data pages of higher resolution and thereby increases the amount of data that can be stored on a data page.

In the works

We will continue improving the data transfer rate※2 of our prototype holographic memory even further, and developing systems that can record and reproduce Super Hi-Vision programs.

  • ●This research is being conducted in collaboration with Nippon Steel & Sumikin Chemical Co., Ltd.
Principle of angular multiplexed holographic memory by using reference beam scanning

Principle of angular multiplexed holographic memory by using reference beam scanning

  • ※1 Two-dimensional data page: A two-dimensional array that represents the zeros and ones of a digital signal as black and white pixels, like a two-dimensional barcode.
  • ※2 Data transfer rate: The quantity of data that can be recorded or reproduced in one second. Units are bits per second (bps).
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