Signal processing and a groove baseband recording method to achieve a high-density optical disc

Area of Science:

• Optical data storage
• Signal processing
• Materials science

Background:

• Optical discs are a primary medium for data storage.
• Increasing data density is crucial for modern storage solutions.
• Existing methods face limitations in signal fidelity and data capacity.

Purpose of the Study:

• To develop a method for recording multilevel signals on optical discs.
• To enhance data density and signal integrity in optical storage.
• To address limitations of current optical recording technologies.

Main Methods:

• Utilizing signal processing to generate multilevel recording signals meeting zero intersymbol interference and zero-dc conditions.
• Emboss recording of the multilevel signal as groove wall position displacement.
• Employing push-pull detection and adaptive equalization for signal playback.
• Implementing feedback control to mitigate nonlinearities in recording and playback systems.

Main Results:

• Successful creation of an experimental disc with 0.6-mum track pitch and 0.28-mum/bit density.
• Clear observation of a two-dimensional eye pattern with 16 levels during playback using a digital versatile disc equivalent optical pickup.
• Demonstration of the effectiveness of the proposed signal processing and feedback techniques.

Conclusions:

• The proposed method enables high-density multilevel signal recording on optical discs.
• The experimental results validate the feasibility and performance of the new recording technique.
• This approach offers a promising pathway for next-generation optical storage solutions.