The Technological Need for Holographic Data Storage

Technical requirements for holographic data storage Digital technology has become the latest synonym in the field of entertainment and computing. Recording cassettes and analog cassettes replace disks, and now the video deck is challenged for digital video discs. Such multimedia applications consume large amounts of storage space and are challenging the limits of today's storage devices. Many solutions have been proposed to keep up with the growing demand for digital data storage devices.

Many holographic data storage models use "page-based" storage where each recording hologram holds a large amount of data, but recent research on submicron-sized "microholograms" has led to several potential 3D optical data. Storage solution Although this data storage method does not allow high data transfer rates for page based storage, tolerance, technical barriers and costs for manufacturing commercial products are significantly reduced. Some holographic materials are capable of recording holograms in a very short time without requiring a development process. This allows people to perform some simple operations in an all-optical way with holography. Examples of such real-time hologram applications include phase conjugate mirrors ("time reversal" of light), optical caching, image processing (pattern recognition of time-varying images), and optical calculations.

In addition to recording images, holography can be used for various purposes. Holographic data storage is a technique that can store information at high density inside crystals or photopolymers. Since many electronic products include storage devices, the ability to store large amounts of information on the medium is important. Holographic storage seems to be the next generation popular storage medium, as the current storage technology like Blu-ray Disc has reached the limit of possible data density (due to the diffraction limited size of the writing beam). An advantage of this type of data storage is to use the volume of the recording medium, not just the surface. Currently available SLMs can generate about 1000 different images per second at 1024 x 1024 bit resolution. If you use the correct type of media (polymer instead of LiNbO 3), the writing speed will be about 1 gigabit per second.

Information is optically stored in crystals or photopolymers. Unlike optical disk storage, which is limited to a small number of surface layers, the holographic storage device can utilize the volume of the entire storage medium. Holographic storage devices are nonvolatile, sequential access, and write once or read / write storage. It can be used for secondary storage and offline storage. See Holographic Versatile Disk (HVD). Device mirroring (replication) - A common solution to this problem is to always keep copies of the same device content on another device (usually the same type). The disadvantage is that this doubles storage space and requires that you update two devices (copies) at the same time, but overhead and delay may occur. Upstream can occur by two independent processes reading the same data set at the same time. This will improve performance.