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
Recordable digital versatile disc for high data transfer rate
- Trang 87-89
The broadcasting of high-definition digital television has been recently
introduced and its data transfer rate is 23 Mbps. As for the storage media,
30-40 Mbps data transfer rate is said to be preferable. Although 4.7 GB
recordable digital versatile disc (DVD-R) will be soon available in the market,
we investigated the potential of DVD-R for higher data transfer rate.
#DVD #Jitter #Disk recording #Interference #Power lasers #Structural discs #Temperature sensors #Chemicals #Consumer electronics #Casting
A module of a blue-violet laser diode and photodiodes for adaptive compensation of spherical-aberration
- Trang 25-27
Much research and development has been reported for high-density optical disc
systems using a blue-violet laser diode (LD) and a high numerical-aperture (NA)
objective. The next phase is now underway - studying ways to mass produce them.
We previously described adaptive compensation of spherical-aberration (SA) and a
single-element objective, for overcoming the narrow tolerance of the substrate
th...
#Diode lasers #Photodiodes #Surface emitting lasers #Substrates #Electrodes #Silicon #Lenses #Chemical lasers #Etching #Mirrors
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
Studies on surface roughening of phase-change optical media
- Trang 78-80
Noise has a strong influence on detected signals, and may be a critical reason
that limits the capacity of optical media (M. Mansuripur, ISOM'2001, Fr-L-01, p.
212, 2001). There are three major classes of noise: system noise, media noise
and electronic noise. With development of high-density phase-change optical
media, it becomes more interesting to study the media noise such as mark
irregularity ...
#Rough surfaces #Surface roughness #Optical noise #Optical surface waves #Optical films #Fractals #Sputtering #Signal detection #Fluctuations #Equations
Domain position detection MAMMOS
- Trang 22-24
This paper introduces a new technique for reading and writing data in a MAMMOS
system in which the position rather than the presence of domains is detected. We
will refer to this new technique as domain position detection or DPD-MAMMOS.
DPD-MAMMOS has several advantages over conventional MAMMOS and mitigates a
number of common problems. Through computer simulation, it is shown how this
technique c...
#Coercive force #Clocks #Coils #Lenses #Power system modeling #Magnetic properties #Laser modes #Thermal lensing #Data storage systems #Synchronization
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
Advanced photoresist for high density groove-recording disc
- Trang 19-21
It is necessary to reduce the mastering noise, particularly for a
groove-recording disc such as the Blu-ray disc. Despite using a deep-UV (DUV)
laser, which is the leading method of forming a groove with a narrow track
pitch, an improvement of the photoresist is also required. There are some
reports which discuss the chemical aspects of photoresist with respect to the
ROM disc signal. However, the...
#Resists #Resins #Optical noise #Noise reduction #Laser noise #Wavelength measurement #Noise measurement #Rough surfaces #Surface roughness #Optical recording
Optical disk system using blue-violet laser
- Trang 422-424
Many technologies for the next DVD generation using a blue-violet laser have
been developed. This disk system will be applied for audio-visual application
and computer peripheral application, like DVD-RAM. In this system three items,
large capacity, high data-transfer-rate and reliability, are equally important
and their targets have been set. To go toward these targets, the following
technologies...
#Application software #Insulation life #Optical signal processing #Computer peripherals #Signal detection #Lenses #Analytical models #Integrated circuit noise #Optical crosstalk #System performance
Feed-forward tracking servo system for high-data-rate optical recording
- Trang 344-346
With the aim of achieving high-speed track following for high-data-rate optical
recording, we have investigated a control system that combines conventional
feedback control with feed-forward control based on the zero phase error
tracking method. In this study, we used a large-capacity, narrow-track-pitch
disk medium, and demonstrated that the proposed tracking servo system is
effective for high-sp...
#Feedforward systems #Servomechanisms #Optical recording #Control systems #Error correction #Cutoff frequency #Velocity control #Target tracking #Optical feedback #HDTV