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Advanced multilayer optical data storage: origins and future prospect
Advanced Optical Concepts in Quantum Computing, Memory, and Communication, 2008
Fifty years have elapsed since the first concepts in volumetric memories have been put forward. Nowadays, the perceived need for low cost removable TB/disk storage systems is one more time fueling the development of 3D media, recording and readout systems. This paper, by reviewing some of the key historic moments and accomplishments in the development of volumetric recording systems attempts to shine light on possible future developments and directions while paying a tribute to many of the researchers that have contributed to the development of this field: in particular to Dr. Hans J. Coufal who for many years has provided vision, guidance, and leadership by leading recent INSIC Technology Roadmap efforts and organizing this conference. He is and will be greatly missed at a time when our common dreams may become a commercial reality.
Study of optical drive systems for two-photon optical data storage
2015
Optical data storage technologies have undergone significant developments over the past few decades, heavily inspired by the high demand for information storage in areas such as medical studies, historical research, and telecommunications. The demand for data storage continues to increase exponentially. However, the current optical data storage techniques are reliant on compact discs (CDs), digital versatile discs (DVDs) and Blu-ray discs (BDs), where data storage capacities are limited to 0.7 GB, 4.7 GB and 23 GB, respectively. These storage capacities cannot satisfy the current demand. Revolutionary ideas, including the two-photon (2P) excitation technique, have been applied to the optical data storage in three dimensions (3D) to increase the data storage capacity. By using a surface plasmon of gold nanorod (GNR) in the 2P optical data storage technique, the data storage capacity can be increased to 1.6 Tbytes/disc. However, currently, no compatible optical disc drive (ODD) system...
Capacity of a 3-D multi-layer optical data storage system
International Symposium on Optical Memory and Optical Data Storage Topical Meeting, 2002
Storage capacity of a 3-D multi-layer optical data storage system is analyzed. Theoretical analysis of recorded bit size and cross-talk are presented and experimentally verified.
2004
A two-dimensional optical storage (TwoDOS) format with binary modulation is being developed in which channel bits are arranged on a two-dimensional hexagonal lattice [W. M. 90 -92]. The aim is to increase the capacity by a factor of 2 and the data rate by a factor of 10 over third-generation Blu-ray Disc technology. Following a route similar to that used in one-dimensional conventional optical storage [Jpn. J. Appl. Phys. 42, 1074 ] could lead to a further increase in capacity by the addition of another dimension to writing data, such as the use of multiple levels instead of the two levels (pit and land) used in the binary TwoDOS disk format. We present a nonlinear signal-processing model for signal waveform generation as a function of the M-ary channel symbols, as well as simulated signal readouts for multilevel TwoDOS.
Optics Letters, 2004
A two-dimensional optical storage (TwoDOS) format with binary modulation is being developed in which channel bits are arranged on a two-dimensional hexagonal lattice [W. M. 90 -92]. The aim is to increase the capacity by a factor of 2 and the data rate by a factor of 10 over third-generation Blu-ray Disc technology. Following a route similar to that used in one-dimensional conventional optical storage [Jpn. J. Appl. Phys. 42, 1074 ] could lead to a further increase in capacity by the addition of another dimension to writing data, such as the use of multiple levels instead of the two levels (pit and land) used in the binary TwoDOS disk format. We present a nonlinear signal-processing model for signal waveform generation as a function of the M-ary channel symbols, as well as simulated signal readouts for multilevel TwoDOS.
Top illuminator design for 2D parallel readout in a 3D multilayer optical data storage system
Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage, 2002
To achieve very high data rates in 3-D multilayer optical data storage systems, a novel approach is investigated to read out in parallel multiple tracks at different layers simultaneously. Data bits at different layers are arranged as titled data pages inside the disk. A uniform optical beam sheet is generated to illuminate the desired data page from the top of the disk, and a depth transfer imaging system is used to collect the fluorescence of the written bits within the data page to a detector array. The performance of the illumination optics has been experimentally evaluated and optimized by aberration compensation and equalization of irradiance distribution on the entire data page. Other important factors including reflection loss, sensitivity to disk quality, and servo requirements of disk wobbling are analyzed.
Motionless-head parallel-readout optical-disk system: experimental results
Applied Optics, 1995
The design, analysis, and feasibility of a novel motionless-head parallel readout optical-disk system are presented. The system is designed to read data blocks distributed radially on the disk's active surface, and it has the unique advantage that no mechanical motion of the head is required for fast access, focusing, or tracking. Data access is achieved solely through the disk rotation, and the entire memory can be read in one rotation. In principle, this permits a data rate of up to 1 Gbyte/s. The data blocks are one-dimensional Fourier-transform computer-generated holograms, each reconstructing one column of a two-dimensional output image. Owing to the information redundancy and shift invariance properties of Fourier-transform holograms, tracking and focusing servo requirements are eliminated. A holographic encoding method is developed to produce high signal-to-noise ratio reconstructions and to reduce significantly the radial alignment requirements of the recorded data bits. The optical readout system consists of only three cylindrical lenses. Two of these may be replaced by a single hybrid diffractive-refractive optical element for easier system alignment and better optical performance, i.e., reduced aberrations and improved resolution. The throughputs and retrieval times of this parallel readout optical-disk system make it well suited to a variety of parallel computing architectures, including a high-performance optoelectronic associative memory [Proc. Soc. Photo-Opt. Instrum. Eng. 1347, 86 (1990].
3-D optical data storage technology
Journal of Emerging Technologies and Innovative Research, 2019
Abstract - 3-D optical data storage technology is one of the modern methods of storing large volumes of data. This paper, discusses in details the fundamentals of 3D optical data storage. This includes the features of the 3D optical data storage and the major components that make up the devices. Nonresonant Multiphoton, Sequential multiphoton absorption, microholography and data recording are some of the writing methods used in the 3D optical data storage. The major challenges that are facing these devices as discussed in the paper are; media sensitivity, Thermodynamic stability and destructive reading. Please feel free to use my research paper in your citations.