High transfer rate (1 Gbit/sec) high-capacity holographic disk digital data storage system

Holographic data storage systems

“…The holy grail for developers of holographic data storage materials developers is to devise a medium with high sensitivity while maintaining a low level of shrinkage. Researchers at Polaroid, Boston, MA, and Bell Laboratories, Murray Hill, NJ, have taken different tacks on this problem, and excellent system demonstrations based on cationic ring opening materials (CROP) (Polaroid) [14], [15] and free-radial media (Lucent) have been made [16]. Data capacities exceeding 250 GB on a DVD-like disk have been measured by Aprilis, and data rates exceeding 10 Gb/s have been demonstrated at Stanford University using Polaroid, and later Aprilis, CROP media [17], [18], To further increase data storage density or capacity per disk, additional material improvements and system optimization are needed.…”

“…The PRISM activities were focused on fundamental recording material issues, while HDSS focused on research and development of new optical and electronic components and digital holographic storage systems. As a result of this team effort, Stanford University has developed, built, and tested a complete, very high transfer rate, and high capacity holographic disk storage system [14] including hardware implemented holographic channel decoding electronics for transfer rates exceeding 10 Gb/s, while providing high capacity storage ( 100 Gb per 6.5-in-diameter disk) in WORM photopolymer media. This system is, to the best of our knowledge, the only complete holographic system built to date; it also still has record-setting performance.…”

“…The material sensitivity, typically measured near , can be determined using (14) The material sensitivity depends on material parameters and recording configuration and is generally reported in centimeters per joule. The sample sensitivity can be determined using (15) where is the exposure time.…”

“…In the first demonstration (in October 1999), JPEG-encoded color images were stored on the holographic disk and retrieved at 1 Gb/s [14], [18]. The source data of 12 images were ECC encoded and converted into holographic channel encoded bitmaps, which were stored in a 200-m-thick Polaroid photopolymer disk media.…”