International Symposium on Optical Memory and Optical Data Storage Topical Meeting
Cơ quản chủ quản: N/A
Lĩnh vực:
Các bài báo tiêu biểu
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
Study on 40 Gbit/inch/sup 2/ density molding using heat insulated mold
- Trang 34-36
Optical disk substrates are usually formed using injection-molding method. High mold temperature is necessary to replicate high-density pits, but may cause bad tilt characteristics of substrates. There was a report of a heat insulated mold in which a heat insulating layer was located at the back of a stamper to improve replication characteristics. In this paper we show the results of examination o......
#Temperature #Shape measurement #Electron beams #Insulation life #Clamps #Cooling #Deformable models
Pits topography measurement by atomic force microscope with carbon nano tube probe
- Trang 63-65
In this study, we fabricated tiny pits with 200-nm dimension for an ultra-high-density optical ROM disk by an electron beam (EB) lithography technique, and observed the topographies of the pits by atomic force microscopy (AFM). Comparison between the images obtained with or without the carbon nanotube (CNT) probe, we clarify the CNT probe is highly effective for the observation of the minute pits,......
#Atomic measurements #Force measurement #Atomic force microscopy #Surfaces #Probes #Atom optics #Optical microscopy #Electron optics #Read only memory #Electron beams
Holographic ROM system for high-speed replication
- Trang 144-146
Conventional holographic memory systems have generally focused on a page-oriented storage approach. One common characteristic of these systems is that they require the recording of thousands of separate holograms, whether as local pages or individually placed bits, in order to fill the memory to capacity. While such configurations are suitable for write-once read-many (WORM) or rewritable memories......
#Holography #Read only memory #Holographic optical components #Optical recording #Optical arrays #Sensor arrays #High speed optical techniques #Optical modulation #Read-write memory #Mirrors
A new data modulation method for multi-level optical recording
- Trang 54-56
Previously, we developed a data detection method named DDPR (Data Detection using Pattern Recognition) for multi-level data recording on optical discs [I]. We have added a new data modulation process, LSB (Least Significant Bit) Limited Modulation (LLM), to DDPR in order to reduce data errors. The LLM modulates Il-bit input data into four eight-level data symbols (3 bits x 4 data = 12 bits) using ......
#Optical recording #Signal processing #Signal generators #Demodulation #Optical modulation #Gas detectors #Research and development #Pattern recognition #Disk recording #Hamming distance
System aspects of dual-layer phase-change recording with high-NA optics and blue laser
- Trang 9-11
The ever-increasing demand for higher capacities driven by data intensive applications such as high-quality video has been met through steady increase of the areal bit density of the optical media. Very recently, the so-called Blu-ray Disc (BD) standard was announced, offering a capacity of up to 27 Gbytes per 12 cm disk. The BD format is designed as a groove-only format, which allows easier ROM, ......
#Optical recording #Disk recording #Video recording #Read only memory #Optical materials #Absorption #Magnetic heads #Shape control #Optical control #Lighting control
Small integrated optical head device using a blue-violet laser diode for Blu-ray Disc system
- Trang 386-388
We report the first integrated optical bead device using a blue-violet LD (laser diode), which is a key device for realizing a small and thin-shaped Blu-ray Disc drive. While integrating seven optical parts into one device, by adopting a molded compound lens with high transmissivity to the blue-violet wavelength, the small size of 11 mm /spl times/ 6 mm /spl times/ 4.1 mm has been realized. At thi......
#Optical devices #Integrated optics #Diode lasers #Optical films #Lenses #Holographic optical components #Holography #Magnetic heads #Mirrors #Assembly
Wobble-address format of the Blu-ray Disc
- Trang 266-268
Recently, a number of companies announced the Blu-ray Disc format. The format is based on a blue-laser diode 405 nm, an objective lens with a high numerical aperture (NA = 0.85), a disc with a thin cover layer (0.1 mm. thick), and phase-change recording on a groove-only substrate. The rewritable area of the Blu-ray Disc has a fixed track pitch of 320 nm and a scalable linear density that results i......
#Information retrieval #Timing #Distortion #Electronics industry #Footwear industry #Laboratories #Industrial electronics #Diodes #Lenses #Apertures
Multilevel signal processing technique for a 30 Gbit/inch/sup 2/ phase change optical disk system
- Trang 278-280
Developed a Viterbi decoder for multilevel signal. Since this decoder compensates nonlinearity and pattern dependence, it improved a noise margin by 3.5dB. We confirmed the feasibility of a phase change optical disk system which has a recording density of 30Gbit/inch/sup 2/.
#Optical signal processing #Optical recording #Viterbi algorithm #Optical noise #Maximum likelihood decoding #Nonlinear optics #Disk recording #Error analysis #Degradation #Computational modeling
Swing arm type pick-up actuator design for near field recording
- Trang 341-343
We proposed and manufactured a swing arm type dual stage pick-up actuator for near field recording. A voice coil motor (VCM) is used as coarse actuator and a PZT block to generate fine motion. Optimal design of VCM part is carried out to maximize driving force. The two-layer PZT fine actuator is used to reduce the maximum operating voltage.
#Actuators #Coils #Assembly #Optical saturation #Capacitive sensors #Voltage #Optical design #Disk recording #Memory #Optical recording