Multi-wavelength storage is an approach to increase the memory density with the problem of crosstalk to be deal with. We apply Low Density Parity Check (LDPC) codes as error-correcting codes in photochromic dual-wavel...
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ISBN:
(纸本)0819455989
Multi-wavelength storage is an approach to increase the memory density with the problem of crosstalk to be deal with. We apply Low Density Parity Check (LDPC) codes as error-correcting codes in photochromic dual-wavelength opticalstorage based on the investigation of LDPC codes in opticaldatastorage. A proper method is applied to reduce the crosstalk and simulation results show that this operation is useful to improve Bit Error Rate (BER) performance. At the same time we can conclude that LDPC codes outperform RS codes in crosstalk channel.
Recent advances have made opticaldata links reality and point the way toward broader optics applications in the computers of the future. Researchers have investigated both analog and digital computing devices and rep...
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Recent advances have made opticaldata links reality and point the way toward broader optics applications in the computers of the future. Researchers have investigated both analog and digital computing devices and reported wide-ranging progress, particularly in the areas of communication and secondary datastorage such as fiber links and CR ROMs. The author summarizes progress in this field.
An effective application of band-limited diffuser is introduced to realize the dual-wavelength method which can reduce the grating decay while retrieving data in the volume holographic datastorage. The Diffuser combi...
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ISBN:
(纸本)0819455989
An effective application of band-limited diffuser is introduced to realize the dual-wavelength method which can reduce the grating decay while retrieving data in the volume holographic datastorage. The Diffuser combined with the imaging system can generate enough wavefronts to match the Brag conditions of all the pixels in the whole image when two wavelengths are used. It is possible to enlarge the size of the retrieved image and get an approximately uniform diffraction efficiency. Experimental setup is presented and the results show that this technique is effective.
Throughout the 30-year history of holographic storage, an enormous number of material systems have been studied for use as the recording medium. In spite of the years and effort expended, the ideal material has not be...
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Throughout the 30-year history of holographic storage, an enormous number of material systems have been studied for use as the recording medium. In spite of the years and effort expended, the ideal material has not been identified and interest in holographic storage has waned. Recently, however, advances in both organic and inorganic photorefractive materials has rekindled interest in volume holography, not only for information storage but also as a technology that may be important for optical interconnects, neural networks and optical computing. Interest is further enhanced by continuing development in some of the enabling technologies, such as CCD arrays and spatial light modulators, necessary to make a viable storage product. After a brief introduction to holographic storage, this paper will concentrate on defining the systems requirements that drive material selection and review recent advances in photorefractive materials and techniques that address key issues. Included will be a discussion of multiplexing methods as well as various means to inhibit, or at least manage, destructive writing and reading. The paper will conclude with a discussion of the remaining critical issues as a focus for continued research and development.
In recent years, there have been many research studies focusing on next generation opticaldatastorage technologies, such as near-field recording and holographic datastorage systems. Many studies from several discip...
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In recent years, there have been many research studies focusing on next generation opticaldatastorage technologies, such as near-field recording and holographic datastorage systems. Many studies from several disciplines have been perfoed and merged to realize of the next generation opticaldatastorage. The technologies that have been developed for opticaldatastorage are also essential for the other research areas. These technologies can be widely applied to various fields, such as near-field optics-based microscopy, small-sized imaging systems, plasmonic nanolithography using a solid immersion lens (SIL) and a nanoscale aperture, and bio-applications. In this paper, the applications and concepts of the next generation of opticalstorage technologies are discussed.
In the past few years considerable demand has developed for oceanic datastorage system that are able to store Petabytes data. Volume holographic recording has the potential to offer high density, fast data readout ra...
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ISBN:
(纸本)0819455989
In the past few years considerable demand has developed for oceanic datastorage system that are able to store Petabytes data. Volume holographic recording has the potential to offer high density, fast data readout rate, and associative content addressable storage as compared with other conventional mass datastoragetechnology. However, its total cost and size impedes to go into market. If the volume holographic device could join network and be shared by more and more customers, the average cost for each customer should be reduced. On the other hand, the growing network storage technologies shake off the traditional storage architecture (DAS) limit including physical topologies and access mode, and provide high scalability, availability and flexible for storage system, moreover are widely applied to many fields. Obviously, it is valuable for building network storage device based on volume holographic. In this paper, we design the architecture and relative software of volume holographic device to enable common storage network, which can support the SAN based on Fibre channel and iSCSI. Our experiment shows the HSD (Holographic storage Device) has excellent performance for network storage.
A calorific equilibrium equation is used to derive the relativities of optimum recording power and pulse waveform parameters in various disc scanning velocities. Based on the model, a new recording parameters calibrat...
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ISBN:
(纸本)0819455989
A calorific equilibrium equation is used to derive the relativities of optimum recording power and pulse waveform parameters in various disc scanning velocities. Based on the model, a new recording parameters calibrating flow is given as a referenced process. A number of optical recording examples have been examined in detail, and the results have been compared with those calculated data by use of a general summation approach.
The optical properties of the Ce:Cu:LiNbO3 co-doped with different concentrations of In were measured, including absorption spectra, infrared transmittance spectra and holographic storage properties. The doped thresho...
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ISBN:
(纸本)0819455989
The optical properties of the Ce:Cu:LiNbO3 co-doped with different concentrations of In were measured, including absorption spectra, infrared transmittance spectra and holographic storage properties. The doped threshold of In was determined via the results of spectrum measurement. When the doped concentration of In is over its threshold, the photo-damage resistance ability of In:Ce:Cu:LiNbO3 is improved dramatically. In the measurement of holographic storage properties, the response time of 34s, diffraction efficiency of 33%, and exponential gain coefficient of 18cm(-1) were obtained for In(3mol%):Ce(0.20wt%):Cu(0.015wt%):LiNbO3 crystal.
Following the development of the opticaldatastoragetechnology, an important issue of reliability should also be paid attention to. The designing core of the reliability test way is, simulating the users' circum...
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ISBN:
(纸本)0819455989
Following the development of the opticaldatastoragetechnology, an important issue of reliability should also be paid attention to. The designing core of the reliability test way is, simulating the users' circumstance and the transporting process. The normal simulating is important but the users' playing situation is extreme irregular. So the normal simulating is not enough for reflecting the virtual operating status. Few long time playing experiments have been done previously. In fact such kind of long time playing experiment is most similar to the users' playing situation, and the effect is compositive since such playing is influenced by current surges, electrostatic discharges, even dust. It seems simple but it is important. We use the optical pickup heads to make sets to play DVD disc continuously for long time, and monitor the image and effect regularly. In our experiment, the optical pickup heads have operated continuously for 6000 hours. It suggests that such kind of long time playing as an additional reliability testing means is necessary, especially for the DVD player's manufacturing company.
3D opticaldatastorage can benefit from the non-linear process of two-photon absorption (TPA). If some chromphores with large TPA cross section are introduced into the diarylethene to enhance its two-photon absorptiv...
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ISBN:
(纸本)0819455989
3D opticaldatastorage can benefit from the non-linear process of two-photon absorption (TPA). If some chromphores with large TPA cross section are introduced into the diarylethene to enhance its two-photon absorptivities, it is expected to be good recording media for 3D opticaldatastorage. The authors have synthesized four diarylperfluorocyclopentene (DPFCP) derivates for the purpose of developing two-photon 3D opticaldatastorage. The nonlinear two-photon absorption (TPA) properties of the compounds were examined, and the reaction and excited state relaxation dynamics after two-photon excitation were investigated. The TPA cross sections of 2-position DPFCPs were measured by means of TPIF (two-photon induced fluorescence) method, and the highest is 48 x 10(-50) cm(4.)s(.)photo(-1.)molecule(-1). The compounds were successfully applied in two-photon 3D opticaldatastorage based on single beam two-photon femtosecond writing and one-photon fluorescence reading. Ten-layer clear images on DPFCP/PMMA film were obtained, and the datastorage density is high to 2.0 - 10(11) bits/cm(3).
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