International Symposium on Optical Memory and Optical Data Storage Topical Meeting
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Holographic storage - elegant technology, elusive product
- Trang 138-140
This article gives a review of holographic data storage, and covers such topics as: history and development; technological issues; recording media; recording and recreation systems; future outlook and prospects.
#Holography #Photorefractive materials #Optical materials #Optical recording #Optical distortion #Optical modulation #Holographic optical components #Liquid crystal displays #Sensor arrays #Costs
High-NA achromatic objective lens
- Trang 395-397
Developed an achromatic high-NA objective making use of non-periodic phase structures. The effectiveness of the achromatic objective lens has been demonstrated in the BD recorder. No reduction of the recording quality due to laser wavelength shift could be observed. Due to the wide nature of the zones, the phase structure can directly be incorporated into the aspherical surface of the objective le......
#Lenses #Power lasers #Optical recording #Optical design #Manufacturing #Refractive index #Diode lasers #Laboratories #Delay #Actuators
Read-write and content-addressable holographic data storage
- Trang 141-143
Recent progress made towards two variants of holographic data storage is summarized. For fast-access read-write systems, the extension of high density to high capacity using phase-conjugate readout, and signal processing to relieve alignment and distortion constraints are described. For content-addressable systems, massively parallel correlators and associated fidelity issues are discussed. The pa......
#Holography #Memory #Material storage #Information retrieval #Holographic optical components #Optical buffering #Optical recording #Optical sensors #Optical materials #Databases
Multilevel-enabled double-density DVD (re)writable
- Trang 434-436
MultiLevel (MLTM) technology was originally developed on a CD-R/RW base to achieve 2GB using trellis-coded (TCM) amplitude-modulation; the 2GB system can be manufactured without any changes to the drive or PUH except for the addition of our new ML Endec LSI and ML-specific firmware. We can now extend this technology to DVD (re)writable systems with a similar cost-effective approach.
#DVD #Testing #Drives #Histograms #Control systems #Manufacturing processes #Large scale integration #Microprogramming #Modulation coding #Decoding
High-speed readout using small near-field optical head module with horizontal light introduction through optical fiber
- Trang 198-200
Near-field optics, a super-resolution technique, is expected for optical data storage with high recording density (E. Betzig et al., Appl. Phys. Lett. vol. 61, p. 142, 1992; S. Hosaka et al, Nanotechnology vol. 8, p. A58, 1997). Recently, near- field optical heads using sliders, which can keep the distance between an aperture and a medium surface in proximity, were proposed, and reading from 110-2......
#High speed optical techniques #Optical fibers #Optical recording #Magnetic heads #Apertures #Optimized production technology #Lenses #Memory #Nanotechnology #Actuators
Adaptive code modulation for 2D optical memories
- Trang 231-233
Volumetric and page oriented optical storage systems have a great potential for high data density and high speed through page oriented data access (Haichuan Zhang et al, Proc. 18th IEEE Symp. Mass Storage Sys., 2001). However, in order to be practical, they have to maintain data integrity using error correction and modulation codes. The coding comes at a cost of spatial overhead of codeword size o......
#Optical modulation #Adaptive coding #Modulation coding #Adaptive optics #Encoding #Optical arrays #High speed optical techniques #Decoding #Costs #Detectors
Study of chemically amplified resist using an electron beam recorder
- Trang 21-23
A user data capacity of more than 23 Gbytes (GB) is required for the next-generation optical disks to store HDTV signals for over 2 hours. To achieve such recording capacity, mastering recorders must have higher resolution performance than present ones. Therefore we have been developing an electron beam recorder (EBR) (Y. Kojima et al, Joint MORIS/ISOM 1997 Tech. Dig., Th-L-06, 1997). Previously w......
#Chemicals #Resists #Electron beams #Optical recording #Disk recording #Electron optics #High speed optical techniques #Stimulated emission #Mass production #HDTV
Tolerance analysis and compensation for focusing unit of near field recording system
- Trang 111-113
Recently, the NFR (near field recording) system has been introduced as a new optical data storage method to realize higher density recording beyond the diffraction limit (H.K. Yoon et al., KSPE, vol. 17, no. 6, pp. 46-52, 2000; E. Betzig et al., Appl. Phys. Lett., vol. 61, pp. 142-144, 1992; B.D. Terris et al, ibid., vol. 68, no. 2, pp. 141-143, 1996; B.D. Terris et al., ibid., vol. 65, no. 4, pp.......
#Tolerance analysis #Optical recording #Lenses #Optical refraction #Optical variables control #Manufacturing #Assembly #Memory #Optical diffraction #Optical propagation
Adaptive signal processing method using PRML for high density optical disks
- Trang 108-110
Numerous types of DVD recording equipment have emerged on the market, and there is much demand for such optical storage systems with high speed and large capacity for digital high definition broadcasts. However, it becomes difficult to maintain data reliability with increasing recording speed and density, because the signal to noise ratio degrades and recording control of the phase changed mark be......
#Adaptive signal processing #Adaptive optics #Optical signal processing #Optical recording #High definition video #High speed optical techniques #Disk recording #Maximum likelihood decoding #DVD #Digital recording
Elliptic solid immersion lens for NFR; compensation for disk thickness variation and disk tilt
- Trang 210-212
In the last decade of optical data storage development, near-field recording (NFR) technology has been suggested for achieving higher areal density. However, there remain several serious and practical issues. The major defects in NFR due to the use of a solid immersion lens (SIL) are dust and thermal problems compared to orthodox optical storage technologies. The existing SIL is delicate in an uns......
#Solids #Lenses #Optical recording #Optical sensors #Memory #Disk recording #Thermal lensing #Surface contamination #Actuators #Servomechanisms