Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Gray-scale data pages for digital holographic data storage

Not Accessible

Your library or personal account may give you access

Abstract

The prospects for gray-scale (or multilevel) digital holographic data storage are theoretically and experimentally investigated. A simple signal-to-noise ratio (SNR) partitioning argument shows that when SNR scales as 1 over the number of holograms squared, five gray levels log2 5 bits/pixel would be expected to result in a 15% capacity increase over binary data pages. However, the additional signal-dependent noise sources present in practical systems create a baseline SNR that reduces both the optimal number of gray levels and the resulting gain in capacity. To implement gray-scale recording experimentally, we adapt the predistortion technique previously developed for binary page-oriented memories [Opt. Lett. 23, 289 (1998)]. Several new block-based modulation codes for decoding gray-scale data pages are introduced. User capacity is evaluated by an experimental technique using LiNbO3:Fe in the 90° geometry. Experimental results show that a balanced modulation code with three gray levels provides a 30% increase in capacity (as well as a 30% increase in readout rate) over local binary thresholding.

© 1998 Optical Society of America

Full Article  |  PDF Article
More Like This
Noise reduction of page-oriented data storage by inverse filtering during recording

Geoffrey W. Burr, Hans Coufal, Robert K. Grygier, John A. Hoffnagle, and C. Michael Jefferson
Opt. Lett. 23(4) 289-291 (1998)

Phase-image-based sparse-gray-level data pages for holographic data storage

Bhargab Das, Joby Joseph, and Kehar Singh
Appl. Opt. 48(28) 5240-5250 (2009)

Experimental evaluation of user capacity in holographic data-storage systems

Geoffrey W. Burr, Wu-chun Chou, Mark A. Neifeld, Hans Coufal, John A. Hoffnagle, and C. Michael Jefferson
Appl. Opt. 37(23) 5431-5443 (1998)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (3)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved