Optical Storage Divider for Real-Time Write Verification
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Solution Overview
Problem
Conventional optical storage systems face challenges in verifying data during the write operation due to noise introduced by high-frequency writing pulses, leading to a low signal-to-noise ratio and inefficient data recovery.
Innovation Solution
The system employs an optical head that splits a light beam into a higher power main beam and lower power side beams, using a controller to process feedback signals from the medium, which removes noise by dividing the signals to generate clean output indicative of the written data directly after writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-power laser beam is used for writing data, then writing speed and efficiency are improved, but noise is introduced in the read signal reducing signal-to-noise ratio
Solution Approach 1:
The optical pickup unit divides the laser beam into multiple beams (main beam and side beams) with different powers. The main beam writes data while side beams read data simultaneously. This segmentation allows separate optimization of write power and read power, enabling high-speed writing without compromising read signal quality.
Solution Approach 2:
The patent uses side beams as intermediary elements that do not directly write data but facilitate real-time verification. These side beams read the data written by the main beam and provide verification signals, acting as a mediator between the writing process and data verification, enabling noise-free readout during high-power writing.
2Loss of time
If direct read after write is performed, then verification time is reduced, but noise from writing pulses interferes with data recovery
Solution Approach 1:
The side beams perform preliminary reading of the data immediately after it is written by the main beam, before the writing pulses completely subside. This preliminary action captures the written data signal while using signal processing techniques to separate it from the writing pulse noise, enabling verification within less than 1 millisecond.
Solution Approach 2:
The system implements real-time feedback by continuously monitoring the signal from side beams during and immediately after the writing process. The controller uses this feedback to verify data integrity in real-time, adjusting parameters as needed to maintain data recovery quality even during high-frequency writing operations.
3Reliability
If separate write and verify operations are used, then signal quality is maintained, but processing time and system complexity increase
Solution Approach 1:
The patent merges the write and verify operations into a single integrated process. The main beam writes data while side beams simultaneously read and verify the written data. This combining of operations eliminates the need for separate write and verify passes, achieving both high signal quality and fast processing speed.
Solution Approach 2:
The optical pickup unit is designed with multi-functionality, where the same optical system handles both writing (via main beam) and reading/verification (via side beams) functions simultaneously. This universal design allows the system to perform multiple operations without requiring separate dedicated hardware for each function, improving processing efficiency.
4Device complexity
If conventional single beam OPU is used, then device complexity is reduced, but real-time verification during write operation is not possible
Solution Approach 1:
The single laser beam is segmented into multiple beams (main beam for writing, side beams for reading) using optical elements like diffraction gratings or beam splitting optics. This segmentation enables the optical system to perform multiple functions simultaneously, achieving real-time verification capability while maintaining relatively simple device architecture.
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 enables real-time verification of written data with improved signal quality, reducing the time between data writing and decoding to less than 1 millisecond and allowing for simultaneous operation across multiple channels with high speed and low cost.
Implementation Method 1
The optical head that splits a light beam into a higher power main beam and at least one lower power side beam
Implementation Method 2
a first signal resulting from the at least one lower power side beam being reflected from the medium
Implementation Method 3
a second signal resulting from scatter of the higher power main beam
Data Source
AI summary
An optical storage system includes an optical head and controller arrangement. The arrangement is configured to write data to an optical medium via a higher power main beam, to read, directly after writing, feedback from the medium containing the written data and noise resulting from the higher power main beam, to remove the noise from the feedback by dividing the feedback with data indicative of the higher power main beam, and to generate output indicative of the written data.