Dual-Side Holographic Storage with Orthogonal Polarization
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Solution Overview
Problem
Existing holographic storage technologies face limitations in recording and reading speed due to the need for continuous stopping and shifting operations, which restricts data recording and reading efficiency and storage density.
Innovation Solution
A holographic storage device and method that utilizes two optical heads with orthogonal polarization beams to simultaneously record and read holograms from both sides of a storage medium, allowing for simultaneous or separate information recording and reading, and incorporating shift multiplexing and circumferential rotation multiplexing to enhance recording and reading speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If continuous stopping and shifting operations are performed for shift multiplexing storage, then storage capacity can be increased, but recording and reading speeds are limited
Solution Approach 1:
The storage system is divided into two independent optical heads (first optical head and second optical head) positioned on opposite sides of the storage medium. Each optical head can independently perform recording and reading operations, allowing parallel processing and eliminating the bottleneck of sequential operations that limited speed while maintaining high storage capacity through continued shift multiplexing
Solution Approach 2:
The invention transitions from single-sided operation to dual-sided operation by positioning optical heads on both sides of the storage medium. This dimensional change enables simultaneous recording and reading operations on different sides, effectively doubling the throughput speed while preserving the shift multiplexing capacity
2Productivity
If shift multiplexing is performed in x-axis and y-axis directions, then continuous recording can be achieved, but shift selectivity in y-axis direction is weak and storage multiplexing quantity is limited
Solution Approach 1:
The weak shift selectivity in the y-axis direction is compensated by introducing a second optical head on the opposite side of the storage medium. Each optical head can independently perform shift multiplexing in both x and y directions, effectively doubling the storage multiplexing quantity while maintaining continuous recording capability
Solution Approach 2:
The invention changes the operational parameters by introducing orthogonal polarization beams from two optical heads simultaneously. This parameter change enables independent control of shift multiplexing in both directions from two sides, overcoming the limitation of weak y-axis shift selectivity and increasing overall storage multiplexing capacity
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
This approach doubles the recording and reading speeds while increasing storage capacity by enabling parallel processing of holographic data on both sides of the storage medium, improving data recording and reading efficiency and capacity.
Implementation Method 1
a first optical head and a second optical head symmetrically disposed on two sides of a storage medium perform information recording and reading simultaneously or separately
Implementation Method 2
polarization of beams between the two optical heads are mutually orthogonal
Implementation Method 3
the multiplexing number can further be increased by circumferentially rotating the storage medium and performing overwritten recording
Implementation Method 4
If the medium is moved by a small distance after the hologram is recorded, the hologram cannot be reproduced
Data Source
AI summary
The present invention relates to a holographic storage device and method for simultaneously recording and reading on two sides, and pertains to the technical field of optical holographic storage. The device and method disclosed in the present invention use a characteristic that orthogonal light would not interfere with each other and a Bragg selectivity characteristic for holographic storage, and use two optical heads to constitute two interference fields orthogonal in polarization directions on two sides of a same position of a holographic storage medium, so as to perform two-path simultaneous recording and reading on a hologram. The device and method provided in the present invention implement two-path parallel recording and reading of holographic storage, and combine shift multiplexing and circumferential rotation multiplexing, thereby improving the speed of an information data recording and reading process while increasing a capacity of the holographic storage.