scholarly journals Non-interferometric phase retrieval for collinear phase-modulated holographic data storage

2020 ◽  
Vol 27 (5) ◽  
pp. 419-426
Author(s):  
Jianying Hao ◽  
Yuhong Ren ◽  
Yuanying Zhang ◽  
Kun Wang ◽  
Hui Li ◽  
...  
Keyword(s):  
Data Storage ◽  
Transfer Rate ◽  
Phase Retrieval ◽  
Data Transfer ◽  
Reference Beam ◽  
Holographic Data Storage ◽  
Holographic Storage ◽  
Data Transfer Rate ◽  
Interferometric Phase ◽  
Data Page

Abstract Because of its simple optical system setup and robust noise tolerance, non-interferometric phase retrieval is an important technique for phase-modulated holographic data storage. Usually, the iterative algorithm of non-interferometry needs hundreds of iteration numbers to retrieve phase accurately, the data transfer rate decreases severely. Strong constraints such as adding embedded data into the phase data page can reduce the iteration numbers, but this method decreases the code rate severely. In this paper, we proposed the advanced non-interferometric phase retrieval method based on the collinear system. By encoding the reference beam of the collinear optical holographic storage system with embedded data, the storage space of the signal beam data page is completely released and the encoding rate is doubled. The embedded data can provide more modulation index including phase and amplitude to shorten iterations, so the data transfer rate is also increased. In the simulation, we recorded a four-level phase pattern and retrieved the phase correctly.

Holographic-Data-Storage Materials

MRS Bulletin ◽  
1996 ◽  
Vol 21 (9) ◽  
pp. 51-60 ◽  
Author(s):  
M-P. Bernal ◽  
G.W. Burr ◽  
H. Coufal ◽  
R.K. Grygier ◽  
J.A. Hoffnagle ◽  
...  
Keyword(s):  
Refractive Index ◽  
Data Storage ◽  
Input Data ◽  
Reference Beam ◽  
Volume Element ◽  
Limiting Factors ◽  
Holographic Data Storage ◽  
Holographic Storage ◽  
Object Beam ◽  
Data Page

In holographic data storage, a photo-sensitive medium is exposed to the interference pattern that is generated when an object beam, with an input data page encoded in the spatial profile of the beam, is intersected by a second, coherent laser beam. The photosensitive medium replicates these interference fringes as a change in optical absorption, refractive index, or thickness. Data are retrieved from the medium by exposing it to light from just one of the beams, which is then diffracted from the stored fringe pattern to reconstruct the other beam, including all the information that had been in the input data page. For a material of sufficient thickness, a large number of interference patterns, each identified by a different grating vector, can be stored or “multiplexed” in the same volume element, with negligible crosstalk between the individual interference patterns. Multiplexing of a large number of pages in the same volume element of the recording medium can be accomplished in several ways—for example by varying the angle between object and reference beam or the wavelength of both beams. Given no other limiting factors, the number of holograms that can be multiplexed in one volume element is directly proportional to the product of the thickness of the medium and its refractive index—that is, materials with optical thicknesses of the order of several millimeters are desirable.By its very nature, the holographic-storage mechanism distributes the stored information redundantly throughout the recording volume.

Wavelet Based Binary Data Compensation in Holographic Data Storage System

2014 ◽  
Author(s):  
Jang Hyun Kim ◽  
Hyunseok Yang
Keyword(s):  
Data Storage ◽  
Transfer Rate ◽  
Storage Capacity ◽  
Data Transfer ◽  
Storage System ◽  
Holographic Data Storage ◽  
Data Transfer Rate ◽  
High Storage Capacity ◽  
Data Storage System ◽  
High Storage

Data storage related with writing and retrieving requires high storage capacity, fast transfer rate and less access time. Today any data storage system cannot satisfy all of these conditions, however holographic data storage system can perform faster data transfer rate because it is a page oriented memory system using volume hologram in writing and retrieving data. System can be constructed without mechanically actuating part therefore fast data transfer rate and high storage capacity about 1Tb/cm3 can be realized. In this paper, storage capacity increased and stable data retrieving are realized in holographic data storage system. Thereby, we propose data pattern recognition by wavelet transform and fuzzy system in holographic data storage system.[1]

Miniature Two-Axis Actuator for High-Data-Transfer-Rate Optical Data Storage System

2002 ◽  
Vol 41 (Part 1, No. 3B) ◽  
pp. 1804-1807 ◽  
Author(s):  
Gakuji Hashimoto ◽  
Hiroki Shima ◽  
Kenji Yamamoto ◽  
Tsutomu Maruyama ◽  
Takashi Nakao ◽  
...  
Keyword(s):  
Data Storage ◽  
Transfer Rate ◽  
Data Transfer ◽  
Storage System ◽  
Optical Data Storage ◽  
Optical Data ◽  
Data Transfer Rate ◽  
High Data ◽  
Data Storage System

scholarly journals Theoretical Study of a Surface Collinear Holographic Memory

Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 70
Author(s):  
Hirayama ◽  
Fujimura ◽  
Umegaki ◽  
Tanaka ◽  
Shimura
Keyword(s):  
Data Storage ◽  
Transfer Rate ◽  
Data Transfer ◽  
Coefficient Of Thermal Expansion ◽  
Storage System ◽  
Reconstructed Image ◽  
Data Transfer Rate ◽  
Holographic Memory ◽  
High Data ◽  
Volume Holograms

Holographic memory is currently attracting attention as a data storage system capable of achieving a data transfer rate of about 105~106105~106 times that of an optical disc such as Blu-ray disc. In conventional holographic memory, data is generally recorded by optical writing using volume holograms. However, a volume hologram has the problem not only that it is required to have high mechanical accuracy of a system and low coefficient of thermal expansion of a recording medium, because reconstruction tolerance is extremely low, but also that duplicating time efficiency is poor because whole data cannot be recorded at once. In this paper we proposed surface holographic memory that achieved a high data transfer rate, stable readout performance, and collective duplication by expressing holograms with fine surface asperity. Furthermore, the theoretical formulas of recording and reconstruction processes in the proposed system were derived and the reconstruction characteristics of the hologram were evaluated by numerical simulation. As a result, the proposed method generated reconstructed image readout with sufficient signal for a single page recording. However, the reconstructed image had noise, which was particular to a surface holographic memory.

Four-level phase pair encoding and decoding with single interferometric phase retrieval for holographic data storage

2018 ◽  
Vol 16 (3) ◽  
pp. 032101 ◽  
Author(s):  
Xiao Lin Xiao Lin ◽  
Yong Huang Yong Huang ◽  
Yang Li Yang Li ◽  
Jinyan Liu Jinyan Liu ◽  
Jinpeng Liu Jinpeng Liu ◽  
...  
Keyword(s):  
Data Storage ◽  
Phase Retrieval ◽  
Holographic Data Storage ◽  
Interferometric Phase

First Prototype of High-Density Ferroelectric Data Storage System

2003 ◽  
Vol 784 ◽  
Author(s):  
Yoshiomi Hiranaga ◽  
Yasuo Cho ◽  
Yasuo Wagatsuma
Keyword(s):  
Data Storage ◽  
Transfer Rate ◽  
Data Transfer ◽  
Storage System ◽  
High Density ◽  
Practical Application ◽  
Data Array ◽  
Data Transfer Rate ◽  
System A ◽  
Data Storage System

ABSTRACTThe first prototype of high-density ferroelectric data storage system based on scanning nonlinear dielectric microscopy was developed in order to establish basic elemental technologies for actual read/write functions aiming for practical application. Using this system, a data transfer rate was evaluated. 9 kbps reading and 50 kbps writing were demonstrated with respect to 440 kbit/inch bit data array written on a lithium tantalate single crystal thin plate. Additionally, we considered future prospects for developing the data storage system with further fast data transfer rate.

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