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Partial response precoding for parallel-readout optical memories
Optics Letters
|October 22, 2009
Summary
Partial response precoding enhances parallel readout optical memories by precompensating for spatial data broadening. This technique significantly improves contrast ratios, enabling higher data density in optical storage systems.
Area of Science:
- Optical Engineering
- Data Storage Technologies
- Signal Processing
Background:
- Optical memory data density is constrained by the band-limited nature of optical systems.
- Spatial data broadening limits resolution and performance in parallel readout optical memories.
Purpose of the Study:
- To investigate the application of partial response precoding to parallel readout optical memories.
- To precompensate for spatial data broadening and improve data density and contrast ratio.
Main Methods:
- Applied partial response precoding, a technique from serial communications, to parallel readout optical systems.
- Experimentally demonstrated the effectiveness of the precoding technique.
Main Results:
- Achieved a factor-of-15 improvement in average worst-case contrast ratio.
- Observed an order-of-magnitude improvement in average contrast ratio.
- Demonstrated that systems without precoding require over 50% more area for equivalent contrast ratios.
Conclusions:
- Partial response precoding is an effective method for overcoming limitations in optical memory data density.
- The technique significantly enhances contrast ratio and spatial resolution in parallel readout systems.
- Precoding offers a pathway to more efficient and higher-density optical data storage.
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