Wavelength-Multiplex Holographic Storage Device
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Solution Overview
Problem
Current holographic storage technologies have limited capacity and access rate due to the use of single-wavelength light beams for information storage, which results in two-dimensional storage and decreased access rates.
Innovation Solution
A wavelength-multiplex and space-multiplex holographic storage device that uses multiple signal light beams with different wavelengths, interfering with a reference light beam to form interference patterns in different-depth storage layers of a holographic disc, enabling three-dimensional data storage with increased capacity and access rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-wavelength light beam is used for information storage, then the device complexity is low, but the storage capacity and access rate are limited due to two-dimensional storage
Solution Approach 1:
The patent transitions from two-dimensional storage to three-dimensional storage by utilizing multiple wavelengths of light. Different wavelengths are focused at different depths within the holographic medium, creating storage layers along the depth axis. This dimensional expansion allows multiple interference patterns to be stored at different positions and depths, dramatically increasing storage capacity without proportionally increasing device complexity.
Solution Approach 2:
The patent changes the wavelength parameter of the light beam to enable multi-dimensional storage. By using a tunable laser source that can operate at multiple wavelengths, the system stores information at different depths corresponding to different wavelengths. This parameter variation allows the same physical medium to store multiple independent data sets simultaneously, resolving the contradiction between simple device structure and large storage capacity.
2Device complexity
If a single-wavelength light beam is used for information storage, then the device structure is simple, but the access rate is low due to two-dimensional storage limitations
Solution Approach 1:
The patent adds the depth dimension to the storage structure by utilizing wavelength-dependent focusing. The tunable laser source emits different wavelengths that are focused at different depths within the holographic medium, creating multiple storage layers. This three-dimensional architecture enables parallel access to multiple data sets by selecting different wavelengths, thereby increasing the access rate without significantly complicating the device structure.
Solution Approach 2:
The patent utilizes wavelength as a selectable parameter to achieve rapid data access. By tuning the laser source to different wavelengths, the system can selectively access information stored at different depths without mechanical movement or sequential scanning. This wavelength-multiplexing approach dramatically improves access rate while maintaining relatively simple device architecture.
3Productivity
If frequency-modulation device is used to modulate signal light beam, then information can be stored, but the access rate is decreased by the frequency-modulation process
Solution Approach 1:
The patent extracts the modulation function from a separate frequency-modulation device and integrates it into the laser source itself. By using a tunable laser source that directly emits different wavelengths corresponding to different data pages, the system eliminates the need for external frequency-modulation hardware. This extraction approach maintains high access rates while reducing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a higher access rate and larger storage capacity by allowing multiple wavelengths to be stored in different positions, resulting in tripled storage density and improved data retrieval efficiency.
Implementation Method 1
a reference light beam illuminating the storage medium and respectively interfering with the signal light beams to form interference patterns
Data Source
AI summary
The present invention discloses a wavelength-multiplex and space-multiplex holographic storage device, which comprises a storage medium, a plurality of signal light beams and at least one reference light beam. The signal light beams have different wavelengths and illuminate the storage medium. The reference light beam illuminates the storage medium and interferes with the signal light beams to form a plurality of interference patterns. The interference patterns are respectively stored on different-depth storage layers of the storage medium. The present invention not only has a high access rate but also has a large storage capacity.