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Modulation coding for pixel-matched holographic data storage.

G W Burr, J Ashley, H Coufal

|May 1, 1997

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This study presents a digital holographic storage system for analyzing noise and codes. It achieved error-free storage of 1200 holograms with a bit-error rate below 2x10(-8).

Area of Science:

Optical Engineering
Data Storage Technologies
Information Theory

Background:

Digital holographic storage offers high-density data retention.
Evaluating noise sources and error-correction codes is crucial for system reliability.
Existing systems face limitations in sensitivity and error rates.

Purpose of the Study:

To develop and evaluate a digital holographic storage system.
To investigate noise sources affecting holographic data.
To assess the performance of modulation and error-correction codes.

Main Methods:

Utilized a precision zoom lens and Fourier transform optics for pixel-to-pixel matching.
Employed angle multiplexing in LiNbO(3):Fe with 90-degree geometry.

Related Experiment Videos

Detected hologram reconstructions using a 60-frame/s CCD camera.

Main Results:

Achieved image transmission down to ~2000 photons per ON camera pixel.
Demonstrated raw bit-error rates (BER) better than 10(-5).
Stored and retrieved 1200 holograms (45,600 user bits each) without error using an 8-12-pixel modulation code, achieving a raw BER <2x10(-8).

Conclusions:

The developed system effectively studies noise and evaluates coding strategies.
High-fidelity holographic data storage is achievable at low photon counts.
Advanced modulation codes significantly improve storage reliability and reduce bit-error rates.