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Related Experiment Videos

Partial-response signaling for phase-change optical data storage without electronic equalization.

Chubing Peng1, Masud Mansuripur

  • 1University of Arizona, Optical Sciences Center, Tucson 85721, USA.

Applied Optics
|June 21, 2002
PubMed
Summary
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This study demonstrates partial-response (PR) signaling for rewritable phase-change optical data storage. Optimized optical recording achieved a 0.25 microm/bit linear density on rewritable digital-versatile disks.

Area of Science:

  • Optical Data Storage
  • Signal Processing

Background:

  • Rewritable phase-change optical data storage faces limitations in achieving higher linear densities.
  • Traditional read channels often require electronic filters to shape signals to partial-response (PR) targets.

Purpose of the Study:

  • To apply partial-response (PR) signaling directly through optical recording in rewritable phase-change optical data storage.
  • To optimize writing parameters using a genetic algorithm to achieve a target PR waveform.
  • To evaluate the feasibility of high linear densities using this method.

Main Methods:

  • Implementing partial-response (PR) signaling via direct optical recording, eliminating the need for electronic filters.
  • Utilizing a genetic algorithm to optimize writing parameters for minimizing waveform differences.

Related Experiment Videos

  • Testing four linear densities (0.4, 0.3, 0.25, and 0.2 microm/bit) with a 0.66 microm laser and 0.6 numerical aperture objective lens.

    • Main Results:

    • A PR-like waveform was directly achieved at the read channel output through optical recording.
    • The genetic algorithm successfully optimized writing parameters.
    • A linear density of 0.25 microm/bit was successfully realized on a rewritable digital-versatile disk.

    Conclusions:

    • Partial-response (PR) signaling can be effectively implemented through optical recording in rewritable phase-change media.
    • This approach bypasses the need for complex electronic filtering in the read channel.
    • Achieving higher linear densities, such as 0.25 microm/bit, is feasible with optimized optical recording parameters.